Add storage stats Prometheus collector for business entity counts

Expose four live gauges queried at each scrape via a custom Collector:
- happydomain_registered_users_total
- happydomain_domains_total
- happydomain_zones_total
- happydomain_providers_total

checks/domain-expiration.go

@@ -0,0 +1,113 @@
+package checks
+
+import (
+	"context"
+	"fmt"
+	"math"
+	"strings"
+	"time"
+
+	"git.happydns.org/happyDomain/model"
+	"git.happydns.org/happyDomain/pkg/domaininfo"
+)
+
+const (
+	DEFAULT_WARNING_DAYS  = 30
+	DEFAULT_CRITICAL_DAYS = 7
+)
+
+func init() {
+	RegisterChecker("domain-expiration", &DomainExpirationCheck{})
+}
+
+type DomainExpirationCheck struct{}
+
+func (p *DomainExpirationCheck) ID() string   { return "domain-expiration" }
+func (p *DomainExpirationCheck) Name() string { return "Domain Expiration" }
+
+func (p *DomainExpirationCheck) Availability() happydns.CheckerAvailability {
+	return happydns.CheckerAvailability{ApplyToDomain: true}
+}
+
+func (p *DomainExpirationCheck) Options() happydns.CheckerOptionsDocumentation {
+	return happydns.CheckerOptionsDocumentation{
+		RunOpts: []happydns.CheckerOptionDocumentation{
+			{Id: "domainName", Type: "string", Label: "Domain name", AutoFill: happydns.AutoFillDomainName, Required: true},
+		},
+		UserOpts: []happydns.CheckerOptionDocumentation{
+			{Id: "warningDays", Type: "number", Label: "Days before expiration to warn", Default: DEFAULT_WARNING_DAYS},
+			{Id: "criticalDays", Type: "number", Label: "Days before expiration to alert", Default: DEFAULT_CRITICAL_DAYS},
+		},
+	}
+}
+
+func (p *DomainExpirationCheck) RunCheck(ctx context.Context, options happydns.CheckerOptions, meta map[string]string) (*happydns.CheckResult, error) {
+	// 1. Extract domainName
+	domainName, ok := options["domainName"].(string)
+	if !ok || domainName == "" {
+		return nil, fmt.Errorf("domainName is required")
+	}
+	domainName = strings.TrimSuffix(domainName, ".")
+
+	// 2. Extract thresholds (with defaults)
+	warningDays := extractInt(options, "warningDays", DEFAULT_WARNING_DAYS)
+	criticalDays := extractInt(options, "criticalDays", DEFAULT_CRITICAL_DAYS)
+
+	// 3. Try RDAP, fallback to WHOIS
+	info, err := domaininfo.GetDomainRDAPInfo(ctx, happydns.Origin(domainName))
+	if err != nil {
+		info, err = domaininfo.GetDomainWhoisInfo(ctx, happydns.Origin(domainName))
+		if err != nil {
+			return nil, fmt.Errorf("failed to retrieve domain info: %w", err)
+		}
+	}
+
+	// 4. Check expiration date presence
+	if info.ExpirationDate == nil {
+		return &happydns.CheckResult{
+			Status:     happydns.CheckResultStatusUnknown,
+			StatusLine: "Expiration date not available",
+			Report:     info,
+		}, nil
+	}
+
+	// 5. Compute days remaining
+	daysUntil := int(math.Ceil(time.Until(*info.ExpirationDate).Hours() / 24))
+
+	// 6. Determine status
+	var status happydns.CheckResultStatus
+	var statusLine string
+	switch {
+	case daysUntil < 0:
+		status = happydns.CheckResultStatusCritical
+		statusLine = fmt.Sprintf("Domain expired %d day(s) ago (expired on %s)", -daysUntil, info.ExpirationDate.Format("2006-01-02"))
+	case daysUntil < criticalDays:
+		status = happydns.CheckResultStatusCritical
+		statusLine = fmt.Sprintf("Domain expires in %d day(s) (on %s)", daysUntil, info.ExpirationDate.Format("2006-01-02"))
+	case daysUntil < warningDays:
+		status = happydns.CheckResultStatusWarn
+		statusLine = fmt.Sprintf("Domain expires in %d day(s) (on %s)", daysUntil, info.ExpirationDate.Format("2006-01-02"))
+	default:
+		status = happydns.CheckResultStatusOK
+		statusLine = fmt.Sprintf("Domain valid until %s (%d days)", info.ExpirationDate.Format("2006-01-02"), daysUntil)
+	}
+
+	return &happydns.CheckResult{
+		Status:     status,
+		StatusLine: statusLine,
+		Report:     info,
+	}, nil
+}
+
+// extractInt reads an int/float64 option with a default fallback.
+func extractInt(options happydns.CheckerOptions, key string, def int) int {
+	if v, ok := options[key]; ok {
+		switch n := v.(type) {
+		case int:
+			return n
+		case float64:
+			return int(n)
+		}
+	}
+	return def
+}

checks/interface.go

@@ -0,0 +1,95 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+// Package checks provides the registry for domain health checkers.
+// It allows individual checker implementations to self-register at startup
+// via init() functions and exposes functions to retrieve registered checkers.
+package checks // import "git.happydns.org/happyDomain/checks"
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+
+	"git.happydns.org/happyDomain/model"
+)
+
+// checkersList is the ordered list of all registered checks.
+var checkersList map[string]happydns.Checker = map[string]happydns.Checker{}
+
+// RegisterChecker declares the existence of the given check. It is intended to
+// be called from init() functions in individual check files so that each check
+// self-registers at program startup.
+//
+// If two checks try to register the same environment name the program will
+// terminate: name collisions are a configuration error, not a runtime one.
+func RegisterChecker(name string, checker happydns.Checker) {
+	log.Println("Registering new checker:")
+	checkersList[name] = checker
+}
+
+// GetCheckers returns the ordered list of all registered checks.
+func GetCheckers() *map[string]happydns.Checker {
+	return &checkersList
+}
+
+// FindChecker returns the check registered under the given environment name,
+// or an error if no check with that name exists.
+func FindChecker(name string) (happydns.Checker, error) {
+	c, ok := checkersList[name]
+	if !ok {
+		return nil, fmt.Errorf("unable to find check %q", name)
+	}
+	return c, nil
+}
+
+// GetCheckInterval returns the checker's preferred scheduling bounds,
+// or nil if the checker does not implement CheckerIntervalProvider.
+func GetCheckInterval(checker happydns.Checker) *happydns.CheckIntervalSpec {
+	ip, ok := checker.(happydns.CheckerIntervalProvider)
+	if !ok {
+		return nil
+	}
+	spec := ip.CheckInterval()
+	return &spec
+}
+
+// GetHTMLReport renders an HTML report for the given checker and raw JSON report data.
+// Returns (html, true, nil) if the checker supports HTML reports, or ("", false, nil) if not.
+func GetHTMLReport(checker happydns.Checker, raw json.RawMessage) (string, bool, error) {
+	hr, ok := checker.(happydns.CheckerHTMLReporter)
+	if !ok {
+		return "", false, nil
+	}
+	html, err := hr.GetHTMLReport(raw)
+	return html, true, err
+}
+
+// GetMetrics extracts time-series metrics from a slice of check results.
+// Returns (report, true, nil) if the checker supports metrics, or (nil, false, nil) if not.
+func GetMetrics(checker happydns.Checker, results []*happydns.CheckResult) (*happydns.MetricsReport, bool, error) {
+	mr, ok := checker.(happydns.CheckerMetricsReporter)
+	if !ok {
+		return nil, false, nil
+	}
+	report, err := mr.ExtractMetrics(results)
+	return report, true, err
+}

checks/ping.go

@@ -0,0 +1,326 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package checks
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net"
+	"strings"
+	"time"
+
+	probing "github.com/prometheus-community/pro-bing"
+
+	"git.happydns.org/happyDomain/model"
+	"git.happydns.org/happyDomain/services/abstract"
+)
+
+func init() {
+	RegisterChecker("ping", &PingCheck{})
+}
+
+// PingReport contains the results of a ping check across one or more targets.
+type PingReport struct {
+	Targets []PingTargetResult `json:"targets"`
+}
+
+// PingTargetResult contains the ping statistics for a single IP address.
+type PingTargetResult struct {
+	Address    string  `json:"address"`
+	RTTMin     float64 `json:"rtt_min"`
+	RTTAvg     float64 `json:"rtt_avg"`
+	RTTMax     float64 `json:"rtt_max"`
+	PacketLoss float64 `json:"packet_loss"`
+	Sent       int     `json:"sent"`
+	Received   int     `json:"received"`
+}
+
+type PingCheck struct{}
+
+func (p *PingCheck) ID() string {
+	return "ping"
+}
+
+func (p *PingCheck) Name() string {
+	return "Ping (ICMP)"
+}
+
+func (p *PingCheck) CheckInterval() happydns.CheckIntervalSpec {
+	return happydns.CheckIntervalSpec{
+		Min:     1 * time.Minute,
+		Max:     1 * time.Hour,
+		Default: 5 * time.Minute,
+	}
+}
+
+func (p *PingCheck) Availability() happydns.CheckerAvailability {
+	return happydns.CheckerAvailability{
+		ApplyToService:  true,
+		LimitToServices: []string{"abstract.Server"},
+	}
+}
+
+func (p *PingCheck) Options() happydns.CheckerOptionsDocumentation {
+	return happydns.CheckerOptionsDocumentation{
+		ServiceOpts: []happydns.CheckerOptionDocumentation{
+			{
+				Id:      "warningRTT",
+				Type:    "number",
+				Label:   "Warning RTT threshold (ms)",
+				Default: float64(100),
+			},
+			{
+				Id:      "criticalRTT",
+				Type:    "number",
+				Label:   "Critical RTT threshold (ms)",
+				Default: float64(500),
+			},
+			{
+				Id:      "warningPacketLoss",
+				Type:    "number",
+				Label:   "Warning packet loss threshold (%)",
+				Default: float64(10),
+			},
+			{
+				Id:      "criticalPacketLoss",
+				Type:    "number",
+				Label:   "Critical packet loss threshold (%)",
+				Default: float64(50),
+			},
+			{
+				Id:      "count",
+				Type:    "number",
+				Label:   "Number of pings to send",
+				Default: float64(5),
+			},
+		},
+		RunOpts: []happydns.CheckerOptionDocumentation{
+			{
+				Id:       "service",
+				Label:    "Service",
+				AutoFill: happydns.AutoFillService,
+			},
+		},
+	}
+}
+
+func getFloatOption(options happydns.CheckerOptions, key string, defaultVal float64) float64 {
+	v, ok := options[key]
+	if !ok {
+		return defaultVal
+	}
+	switch val := v.(type) {
+	case float64:
+		return val
+	case json.Number:
+		f, err := val.Float64()
+		if err != nil {
+			return defaultVal
+		}
+		return f
+	default:
+		return defaultVal
+	}
+}
+
+func getIntOption(options happydns.CheckerOptions, key string, defaultVal int) int {
+	return int(getFloatOption(options, key, float64(defaultVal)))
+}
+
+// ipsFromServiceOption extracts the IP addresses directly from the auto-filled
+// service body (abstract.Server). Only IPs actually present in the service
+// definition are returned, so an IPv4-only service won't trigger IPv6 pings.
+// The service JSON has the shape:
+//
+//	{"_svctype":"abstract.Server","Service":{"A":{...},"AAAA":{...}}}
+func ipsFromServiceOption(svc *happydns.ServiceMessage) []net.IP {
+	var server abstract.Server
+	if err := json.Unmarshal(svc.Service, &server); err != nil {
+		return nil
+	}
+
+	var ips []net.IP
+	if server.A != nil && len(server.A.A) > 0 {
+		ips = append(ips, server.A.A)
+	}
+	if server.AAAA != nil && len(server.AAAA.AAAA) > 0 {
+		ips = append(ips, server.AAAA.AAAA)
+	}
+	return ips
+}
+
+func (p *PingCheck) RunCheck(ctx context.Context, options happydns.CheckerOptions, meta map[string]string) (*happydns.CheckResult, error) {
+	service, ok := options["service"].(*happydns.ServiceMessage)
+	if !ok {
+		return nil, fmt.Errorf("service not defined")
+	}
+	if service.Type != "abstract.Server" {
+		return nil, fmt.Errorf("service is %s, expected abstract.Server", service.Type)
+	}
+
+	warningRTT := getFloatOption(options, "warningRTT", 100)
+	criticalRTT := getFloatOption(options, "criticalRTT", 500)
+	warningPacketLoss := getFloatOption(options, "warningPacketLoss", 10)
+	criticalPacketLoss := getFloatOption(options, "criticalPacketLoss", 50)
+	count := getIntOption(options, "count", 5)
+
+	if count < 1 {
+		count = 1
+	}
+	if count > 20 {
+		count = 20
+	}
+
+	// Prefer IPs from the service definition; fall back to live DNS.
+	// Using service IPs avoids pinging addresses not defined in the service
+	// (e.g. live IPv6 records that the service doesn't have).
+	var rawIPs []net.IP
+	if serviceIPs := ipsFromServiceOption(service); len(serviceIPs) > 0 {
+		rawIPs = serviceIPs
+	}
+	if len(rawIPs) == 0 {
+		return nil, fmt.Errorf("no IP addresses found for %s", service.Domain)
+	}
+
+	report := PingReport{}
+	var overallStatus happydns.CheckResultStatus = happydns.CheckResultStatusOK
+	var summaryParts []string
+	var errs []error
+
+	for _, ip := range rawIPs {
+		addr := ip.String()
+
+		pinger, err := probing.NewPinger(addr)
+		if err != nil {
+			errs = append(errs, fmt.Errorf("failed to create pinger for %s: %w", addr, err))
+			continue
+		}
+
+		pinger.Count = count
+		pinger.Timeout = time.Duration(count)*time.Second + 5*time.Second
+
+		if err = pinger.RunWithContext(ctx); err != nil {
+			errs = append(errs, fmt.Errorf("ping failed for %s: %w", addr, err))
+			continue
+		}
+
+		stats := pinger.Statistics()
+		target := PingTargetResult{
+			Address:    addr,
+			RTTMin:     float64(stats.MinRtt.Microseconds()) / 1000.0,
+			RTTAvg:     float64(stats.AvgRtt.Microseconds()) / 1000.0,
+			RTTMax:     float64(stats.MaxRtt.Microseconds()) / 1000.0,
+			PacketLoss: stats.PacketLoss,
+			Sent:       stats.PacketsSent,
+			Received:   stats.PacketsRecv,
+		}
+		report.Targets = append(report.Targets, target)
+
+		if target.PacketLoss >= criticalPacketLoss || target.RTTAvg >= criticalRTT {
+			overallStatus = happydns.CheckResultStatusCritical
+		} else if (target.PacketLoss >= warningPacketLoss || target.RTTAvg >= warningRTT) && overallStatus > happydns.CheckResultStatusWarn {
+			overallStatus = happydns.CheckResultStatusWarn
+		}
+
+		summaryParts = append(summaryParts, fmt.Sprintf("%s: %.1fms avg, %.0f%% loss", addr, target.RTTAvg, target.PacketLoss))
+	}
+
+	// If no IP responded at all, return the combined errors as a fatal error.
+	if len(report.Targets) == 0 {
+		return nil, errors.Join(errs...)
+	}
+
+	return &happydns.CheckResult{
+		Status:     overallStatus,
+		StatusLine: strings.Join(summaryParts, " | "),
+		Report:     report,
+	}, errors.Join(errs...)
+}
+
+// ExtractMetrics implements happydns.CheckerMetricsReporter.
+func (p *PingCheck) ExtractMetrics(results []*happydns.CheckResult) (*happydns.MetricsReport, error) {
+	type seriesKey struct {
+		metric  string
+		address string
+	}
+	seriesMap := map[seriesKey]*happydns.MetricSeries{}
+	var seriesOrder []seriesKey
+
+	for _, result := range results {
+		if result.Report == nil {
+			continue
+		}
+
+		raw, err := json.Marshal(result.Report)
+		if err != nil {
+			continue
+		}
+
+		var report PingReport
+		if err := json.Unmarshal(raw, &report); err != nil {
+			continue
+		}
+
+		for _, target := range report.Targets {
+			ts := result.ExecutedAt
+
+			metrics := []struct {
+				suffix string
+				label  string
+				unit   string
+				value  float64
+			}{
+				{"rtt_avg", "RTT Avg", "ms", target.RTTAvg},
+				{"rtt_min", "RTT Min", "ms", target.RTTMin},
+				{"rtt_max", "RTT Max", "ms", target.RTTMax},
+				{"packet_loss", "Packet Loss", "%", target.PacketLoss},
+			}
+
+			for _, m := range metrics {
+				key := seriesKey{metric: m.suffix, address: target.Address}
+				s, exists := seriesMap[key]
+				if !exists {
+					s = &happydns.MetricSeries{
+						Name:  fmt.Sprintf("%s_%s", m.suffix, target.Address),
+						Label: fmt.Sprintf("%s (%s)", m.label, target.Address),
+						Unit:  m.unit,
+					}
+					seriesMap[key] = s
+					seriesOrder = append(seriesOrder, key)
+				}
+				s.Points = append(s.Points, happydns.MetricPoint{
+					Timestamp: ts,
+					Value:     m.value,
+				})
+			}
+		}
+	}
+
+	var series []happydns.MetricSeries
+	for _, key := range seriesOrder {
+		series = append(series, *seriesMap[key])
+	}
+
+	return &happydns.MetricsReport{Series: series}, nil
+}

checks/zonemaster.go

@@ -0,0 +1,615 @@
+package checks
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"html/template"
+	"io"
+	"net/http"
+	"sort"
+	"strings"
+	"time"
+
+	"git.happydns.org/happyDomain/model"
+)
+
+func init() {
+	RegisterChecker("zonemaster", &ZonemasterCheck{})
+}
+
+type ZonemasterCheck struct{}
+
+func (p *ZonemasterCheck) ID() string {
+	return "zonemaster"
+}
+
+func (p *ZonemasterCheck) Name() string {
+	return "Zonemaster"
+}
+
+func (p *ZonemasterCheck) CheckInterval() happydns.CheckIntervalSpec {
+	return happydns.CheckIntervalSpec{
+		Min:     1 * time.Hour,
+		Max:     7 * 24 * time.Hour,
+		Default: 24 * time.Hour,
+	}
+}
+
+func (p *ZonemasterCheck) Availability() happydns.CheckerAvailability {
+	return happydns.CheckerAvailability{
+		ApplyToDomain: true,
+	}
+}
+
+func (p *ZonemasterCheck) Options() happydns.CheckerOptionsDocumentation {
+	return happydns.CheckerOptionsDocumentation{
+		RunOpts: []happydns.CheckerOptionDocumentation{
+			{
+				Id:       "domainName",
+				Type:     "string",
+				Label:    "Domain name to check",
+				AutoFill: happydns.AutoFillDomainName,
+				Required: true,
+			},
+			{
+				Id:          "profile",
+				Type:        "string",
+				Label:       "Profile",
+				Placeholder: "default",
+				Default:     "default",
+			},
+		},
+		UserOpts: []happydns.CheckerOptionDocumentation{
+			{
+				Id:      "language",
+				Type:    "select",
+				Label:   "Result language",
+				Default: "en",
+				Choices: []string{
+					"en", // English
+					"fr", // French
+					"de", // German
+					"es", // Spanish
+					"sv", // Swedish
+					"da", // Danish
+					"fi", // Finnish
+					"nb", // Norwegian Bokmål
+					"nl", // Dutch
+					"pt", // Portuguese
+				},
+			},
+		},
+		AdminOpts: []happydns.CheckerOptionDocumentation{
+			{
+				Id:          "zonemasterAPIURL",
+				Type:        "string",
+				Label:       "Zonemaster API URL",
+				Placeholder: "https://zonemaster.net/api",
+				Default:     "https://zonemaster.net/api",
+			},
+		},
+	}
+}
+
+// JSON-RPC request/response structures
+type jsonRPCRequest struct {
+	Jsonrpc string `json:"jsonrpc"`
+	Method  string `json:"method"`
+	Params  any    `json:"params"`
+	ID      int    `json:"id"`
+}
+
+type jsonRPCResponse struct {
+	Jsonrpc string          `json:"jsonrpc"`
+	Result  json.RawMessage `json:"result,omitempty"`
+	Error   *struct {
+		Code    int    `json:"code"`
+		Message string `json:"message"`
+	} `json:"error,omitempty"`
+	ID int `json:"id"`
+}
+
+// Zonemaster API structures
+type startTestParams struct {
+	Domain  string `json:"domain"`
+	Profile string `json:"profile,omitempty"`
+	IPv4    bool   `json:"ipv4,omitempty"`
+	IPv6    bool   `json:"ipv6,omitempty"`
+}
+
+type testProgressParams struct {
+	TestID string `json:"test_id"`
+}
+
+type getResultsParams struct {
+	ID       string `json:"id"`
+	Language string `json:"language"`
+}
+
+type testResult struct {
+	Module   string `json:"module"`
+	Message  string `json:"message"`
+	Level    string `json:"level"`
+	Testcase string `json:"testcase,omitempty"`
+}
+
+type zonemasterResults struct {
+	CreatedAt            string            `json:"created_at"`
+	HashID               string            `json:"hash_id"`
+	Language             string            `json:"language,omitempty"`
+	Params               map[string]any    `json:"params"`
+	Results              []testResult      `json:"results"`
+	TestcaseDescriptions map[string]string `json:"testcase_descriptions,omitempty"`
+}
+
+func (p *ZonemasterCheck) callJSONRPC(ctx context.Context, apiURL, method string, params any) (json.RawMessage, error) {
+	reqBody := jsonRPCRequest{
+		Jsonrpc: "2.0",
+		Method:  method,
+		Params:  params,
+		ID:      1,
+	}
+
+	jsonData, err := json.Marshal(reqBody)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal request: %w", err)
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, apiURL, bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("failed to call API: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return nil, fmt.Errorf("API returned status %d: %s", resp.StatusCode, string(body))
+	}
+
+	var rpcResp jsonRPCResponse
+	if err := json.NewDecoder(resp.Body).Decode(&rpcResp); err != nil {
+		return nil, fmt.Errorf("failed to decode response: %w", err)
+	}
+
+	if rpcResp.Error != nil {
+		return nil, fmt.Errorf("API error %d: %s", rpcResp.Error.Code, rpcResp.Error.Message)
+	}
+
+	return rpcResp.Result, nil
+}
+
+func (p *ZonemasterCheck) RunCheck(ctx context.Context, options happydns.CheckerOptions, meta map[string]string) (*happydns.CheckResult, error) {
+	// Extract options
+	domainName, ok := options["domainName"].(string)
+	if !ok || domainName == "" {
+		return nil, fmt.Errorf("domainName is required")
+	}
+	domainName = strings.TrimSuffix(domainName, ".")
+
+	apiURL, ok := options["zonemasterAPIURL"].(string)
+	if !ok || apiURL == "" {
+		return nil, fmt.Errorf("zonemasterAPIURL is required")
+	}
+	apiURL = strings.TrimSuffix(apiURL, "/")
+
+	language := "en"
+	if lang, ok := options["language"].(string); ok && lang != "" {
+		language = lang
+	}
+
+	profile := "default"
+	if prof, ok := options["profile"].(string); ok && prof != "" {
+		profile = prof
+	}
+
+	// Step 1: Start the test
+	startParams := startTestParams{
+		Domain:  domainName,
+		Profile: profile,
+		IPv4:    true,
+		IPv6:    true,
+	}
+
+	result, err := p.callJSONRPC(ctx, apiURL, "start_domain_test", startParams)
+	if err != nil {
+		return nil, fmt.Errorf("failed to start test: %w", err)
+	}
+
+	var testID string
+	if err = json.Unmarshal(result, &testID); err != nil {
+		return nil, fmt.Errorf("failed to parse test ID: %w", err)
+	}
+
+	if testID == "" {
+		return nil, fmt.Errorf("received empty test ID")
+	}
+
+	// Step 2: Poll for test completion
+	progressParams := testProgressParams{TestID: testID}
+	ticker := time.NewTicker(2 * time.Second)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return nil, fmt.Errorf("test cancelled (test ID: %s): %w", testID, ctx.Err())
+
+		case <-ticker.C:
+			result, err := p.callJSONRPC(ctx, apiURL, "test_progress", progressParams)
+			if err != nil {
+				return nil, fmt.Errorf("failed to test progress: %w", err)
+			}
+
+			var progress float64
+			if err := json.Unmarshal(result, &progress); err != nil {
+				return nil, fmt.Errorf("failed to parse progress: %w", err)
+			}
+
+			if progress >= 100 {
+				goto testComplete
+			}
+		}
+	}
+
+testComplete:
+	// Step 3: Get test results
+	resultsParams := getResultsParams{
+		ID:       testID,
+		Language: language,
+	}
+
+	result, err = p.callJSONRPC(ctx, apiURL, "get_test_results", resultsParams)
+	if err != nil {
+		return nil, fmt.Errorf("failed to get results: %w", err)
+	}
+
+	var results zonemasterResults
+	if err := json.Unmarshal(result, &results); err != nil {
+		return nil, fmt.Errorf("failed to parse results: %w", err)
+	}
+	results.Language = language
+
+	// Analyze results to determine overall status
+	var (
+		errorCount   int
+		warningCount int
+		infoCount    int
+		criticalMsgs []string
+	)
+
+	for _, r := range results.Results {
+		switch strings.ToUpper(r.Level) {
+		case "CRITICAL", "ERROR":
+			errorCount++
+			if len(criticalMsgs) < 5 { // Keep first 5 critical messages
+				criticalMsgs = append(criticalMsgs, r.Message)
+			}
+		case "WARNING":
+			warningCount++
+		case "INFO", "NOTICE":
+			infoCount++
+		}
+	}
+
+	// Determine status
+	var status happydns.CheckResultStatus
+	var statusLine string
+
+	if errorCount > 0 {
+		status = happydns.CheckResultStatusCritical
+		statusLine = fmt.Sprintf("%d error(s), %d warning(s) found", errorCount, warningCount)
+		if len(criticalMsgs) > 0 {
+			statusLine += ": " + strings.Join(criticalMsgs[:min(2, len(criticalMsgs))], "; ")
+		}
+	} else if warningCount > 0 {
+		status = happydns.CheckResultStatusWarn
+		statusLine = fmt.Sprintf("%d warning(s) found", warningCount)
+	} else {
+		status = happydns.CheckResultStatusOK
+		statusLine = fmt.Sprintf("All checks passed (%d checks)", len(results.Results))
+	}
+
+	return &happydns.CheckResult{
+		Status:     status,
+		StatusLine: statusLine,
+		Report:     results,
+	}, nil
+}
+
+// ── HTML report ───────────────────────────────────────────────────────────────
+
+// zmLevelDisplayOrder defines the severity order used for sorting and display.
+var zmLevelDisplayOrder = []string{"CRITICAL", "ERROR", "WARNING", "NOTICE", "INFO", "DEBUG"}
+
+var zmLevelRank = func() map[string]int {
+	m := make(map[string]int, len(zmLevelDisplayOrder))
+	for i, l := range zmLevelDisplayOrder {
+		m[l] = len(zmLevelDisplayOrder) - i
+	}
+	return m
+}()
+
+type zmLevelCount struct {
+	Level string
+	Count int
+}
+
+type zmModuleGroup struct {
+	Name     string
+	Position int // first-seen index, used as tiebreaker in sort
+	Results  []testResult
+	Levels   []zmLevelCount // sorted by severity desc, zeros omitted
+	Worst    string
+	Open     bool
+}
+
+type zmTemplateData struct {
+	Domain    string
+	CreatedAt string
+	HashID    string
+	Language  string
+	Modules   []zmModuleGroup
+	Totals    []zmLevelCount // sorted by severity desc, zeros omitted
+}
+
+var zonemasterHTMLTemplate = template.Must(
+	template.New("zonemaster").
+		Funcs(template.FuncMap{
+			"badgeClass": func(level string) string {
+				switch strings.ToUpper(level) {
+				case "CRITICAL":
+					return "badge-critical"
+				case "ERROR":
+					return "badge-error"
+				case "WARNING":
+					return "badge-warning"
+				case "NOTICE":
+					return "badge-notice"
+				case "INFO":
+					return "badge-info"
+				default:
+					return "badge-debug"
+				}
+			},
+		}).
+		Parse(`<!DOCTYPE html>
+<html lang="{{.Language}}">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>Zonemaster{{if .Domain}} — {{.Domain}}{{end}}</title>
+<style>
+*, *::before, *::after { box-sizing: border-box; }
+:root {
+  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+  font-size: 14px;
+  line-height: 1.5;
+  color: #1f2937;
+  background: #f3f4f6;
+}
+body { margin: 0; padding: 1rem; }
+a { color: inherit; }
+code { font-family: ui-monospace, monospace; font-size: .9em; }
+
+/* Header card */
+.hd {
+  background: #fff;
+  border-radius: 10px;
+  padding: 1rem 1.25rem 1.1rem;
+  margin-bottom: .75rem;
+  box-shadow: 0 1px 3px rgba(0,0,0,.08);
+}
+.hd h1 { margin: 0 0 .2rem; font-size: 1.15rem; font-weight: 700; }
+.hd .meta { color: #6b7280; font-size: .82rem; margin-bottom: .6rem; }
+.totals { display: flex; gap: .35rem; flex-wrap: wrap; }
+
+/* Badges */
+.badge {
+  display: inline-flex; align-items: center;
+  padding: .18em .55em;
+  border-radius: 9999px;
+  font-size: .72rem; font-weight: 700;
+  letter-spacing: .02em; white-space: nowrap;
+}
+.badge-critical { background: #fee2e2; color: #991b1b; }
+.badge-error    { background: #ffedd5; color: #9a3412; }
+.badge-warning  { background: #fef3c7; color: #92400e; }
+.badge-notice   { background: #e0f2fe; color: #075985; }
+.badge-info     { background: #dbeafe; color: #1e40af; }
+.badge-debug    { background: #f3f4f6; color: #4b5563; }
+
+/* Accordion */
+details {
+  background: #fff;
+  border-radius: 8px;
+  margin-bottom: .45rem;
+  box-shadow: 0 1px 3px rgba(0,0,0,.07);
+  overflow: hidden;
+}
+summary {
+  display: flex; align-items: center; gap: .5rem;
+  padding: .65rem 1rem;
+  cursor: pointer;
+  user-select: none;
+  list-style: none;
+}
+summary::-webkit-details-marker { display: none; }
+summary::before {
+  content: "▶";
+  font-size: .65rem;
+  color: #9ca3af;
+  transition: transform .15s;
+  flex-shrink: 0;
+}
+details[open] > summary::before { transform: rotate(90deg); }
+.mod-name { font-weight: 600; flex: 1; font-size: .9rem; }
+.mod-badges { display: flex; gap: .25rem; flex-wrap: wrap; }
+
+/* Result rows */
+.results { border-top: 1px solid #f3f4f6; }
+.row {
+  display: grid;
+  grid-template-columns: max-content 1fr;
+  gap: .6rem;
+  padding: .45rem 1rem;
+  border-bottom: 1px solid #f9fafb;
+  align-items: start;
+}
+.row:last-child { border-bottom: none; }
+.row-msg { color: #374151; }
+.row-tc  { font-size: .75rem; color: #9ca3af; }
+</style>
+</head>
+<body>
+
+<div class="hd">
+  <h1>Zonemaster{{if .Domain}} — <code>{{.Domain}}</code>{{end}}</h1>
+  <div class="meta">
+    {{- if .CreatedAt}}Run at {{.CreatedAt}}{{end -}}
+    {{- if and .CreatedAt .HashID}} &middot; {{end -}}
+    {{- if .HashID}}ID: <code>{{.HashID}}</code>{{end -}}
+  </div>
+  <div class="totals">
+    {{- range .Totals}}
+    <span class="badge {{badgeClass .Level}}">{{.Level}}&nbsp;{{.Count}}</span>
+    {{- end}}
+  </div>
+</div>
+
+{{range .Modules -}}
+<details{{if .Open}} open{{end}}>
+  <summary>
+    <span class="mod-name">{{.Name}}</span>
+    <span class="mod-badges">
+      {{- range .Levels}}
+      <span class="badge {{badgeClass .Level}}">{{.Count}}</span>
+      {{- end}}
+    </span>
+  </summary>
+  <div class="results">
+    {{- range .Results}}
+    <div class="row">
+      <span class="badge {{badgeClass .Level}}">{{.Level}}</span>
+      <div>
+        <div class="row-msg">{{.Message}}</div>
+        {{- if .Testcase}}<div class="row-tc">{{.Testcase}}</div>{{end}}
+      </div>
+    </div>
+    {{- end}}
+  </div>
+</details>
+{{end -}}
+
+</body>
+</html>`),
+)
+
+// GetHTMLReport implements happydns.CheckerHTMLReporter.
+func (p *ZonemasterCheck) GetHTMLReport(raw json.RawMessage) (string, error) {
+	var results zonemasterResults
+	if err := json.Unmarshal(raw, &results); err != nil {
+		return "", fmt.Errorf("failed to unmarshal zonemaster results: %w", err)
+	}
+
+	// Group results by module, preserving first-seen order.
+	moduleOrder := []string{}
+	moduleMap := map[string][]testResult{}
+	for _, r := range results.Results {
+		if _, seen := moduleMap[r.Module]; !seen {
+			moduleOrder = append(moduleOrder, r.Module)
+		}
+		moduleMap[r.Module] = append(moduleMap[r.Module], r)
+	}
+
+	totalCounts := map[string]int{}
+
+	var modules []zmModuleGroup
+	for _, name := range moduleOrder {
+		rs := moduleMap[name]
+		counts := map[string]int{}
+		for _, r := range rs {
+			lvl := strings.ToUpper(r.Level)
+			counts[lvl]++
+			totalCounts[lvl]++
+		}
+
+		// Find worst level and build sorted level-count slice.
+		worst := ""
+		worstRank := -1
+		var levels []zmLevelCount
+		for _, l := range zmLevelDisplayOrder {
+			if n, ok := counts[l]; ok && n > 0 {
+				levels = append(levels, zmLevelCount{Level: l, Count: n})
+				if zmLevelRank[l] > worstRank {
+					worstRank = zmLevelRank[l]
+					worst = l
+				}
+			}
+		}
+		// Append any unknown levels last.
+		for l, n := range counts {
+			if _, known := zmLevelRank[l]; !known {
+				levels = append(levels, zmLevelCount{Level: l, Count: n})
+			}
+		}
+
+		modules = append(modules, zmModuleGroup{
+			Name:     name,
+			Position: len(modules),
+			Results:  rs,
+			Levels:   levels,
+			Worst:    worst,
+			Open:     worst == "CRITICAL" || worst == "ERROR",
+		})
+	}
+
+	// Sort modules: most severe first, then by original appearance order.
+	sort.Slice(modules, func(i, j int) bool {
+		ri, rj := zmLevelRank[modules[i].Worst], zmLevelRank[modules[j].Worst]
+		if ri != rj {
+			return ri > rj
+		}
+		return modules[i].Position < modules[j].Position
+	})
+
+	// Build sorted totals slice.
+	var totals []zmLevelCount
+	for _, l := range zmLevelDisplayOrder {
+		if n, ok := totalCounts[l]; ok && n > 0 {
+			totals = append(totals, zmLevelCount{Level: l, Count: n})
+		}
+	}
+
+	domain := ""
+	if d, ok := results.Params["domain"]; ok {
+		domain = fmt.Sprintf("%v", d)
+	}
+
+	lang := results.Language
+	if lang == "" {
+		lang = "en"
+	}
+
+	data := zmTemplateData{
+		Domain:    domain,
+		CreatedAt: results.CreatedAt,
+		HashID:    results.HashID,
+		Language:  lang,
+		Modules:   modules,
+		Totals:    totals,
+	}
+
+	var buf strings.Builder
+	if err := zonemasterHTMLTemplate.Execute(&buf, data); err != nil {
+		return "", fmt.Errorf("failed to render zonemaster HTML report: %w", err)
+	}
+	return buf.String(), nil
+}

cmd/happyDomain/main.go

@@ -33,6 +33,7 @@ import (
 	"git.happydns.org/happyDomain/internal/api/controller"
 	"git.happydns.org/happyDomain/internal/app"
 	"git.happydns.org/happyDomain/internal/config"
+	"git.happydns.org/happyDomain/internal/metrics"
 	_ "git.happydns.org/happyDomain/internal/storage/inmemory"
 	_ "git.happydns.org/happyDomain/internal/storage/leveldb"
 	_ "git.happydns.org/happyDomain/internal/storage/oracle-nosql"
@@ -56,8 +57,10 @@ func main() {
 	}
 	if Version == "custom-build" {
 		controller.HDVersion.Version = versioninfo.Short()
+		metrics.SetBuildInfo(versioninfo.Short())
 	} else {
 		versioninfo.Version = Version
+		metrics.SetBuildInfo(Version)
 	}
 
 	log.Println("This is happyDomain", versioninfo.Short())

go.mod

@@ -17,10 +17,15 @@ require (
 	github.com/gorilla/securecookie v1.1.2
 	github.com/gorilla/sessions v1.4.0
 	github.com/lib/pq v1.11.2
+	github.com/likexian/whois v1.15.7
+	github.com/likexian/whois-parser v1.24.21
 	github.com/miekg/dns v1.1.72
 	github.com/mileusna/useragent v1.3.5
+	github.com/openrdap/rdap v0.9.1
 	github.com/oracle/nosql-go-sdk v1.4.7
 	github.com/ovh/go-ovh v1.9.0
+	github.com/prometheus-community/pro-bing v0.8.0
+	github.com/prometheus/client_golang v1.23.2
 	github.com/rrivera/identicon v0.0.0-20240116195454-d5ba35832c0d
 	github.com/swaggo/files v1.0.1
 	github.com/swaggo/gin-swagger v1.6.1
@@ -53,6 +58,8 @@ require (
 	github.com/PuerkitoBio/goquery v1.11.0 // indirect
 	github.com/Shopify/goreferrer v0.0.0-20250617153402-88c1d9a79b05 // indirect
 	github.com/akamai/AkamaiOPEN-edgegrid-golang/v12 v12.3.0 // indirect
+	github.com/alecthomas/kingpin/v2 v2.4.0 // indirect
+	github.com/alecthomas/units v0.0.0-20240927000941-0f3dac36c52b // indirect
 	github.com/aliyun/alibaba-cloud-sdk-go v1.63.107 // indirect
 	github.com/andybalholm/brotli v1.2.0 // indirect
 	github.com/andybalholm/cascadia v1.3.3 // indirect
@@ -157,6 +164,7 @@ require (
 	github.com/labstack/echo/v4 v4.15.0 // indirect
 	github.com/labstack/gommon v0.4.2 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/likexian/gokit v0.25.16 // indirect
 	github.com/luadns/luadns-go v0.3.0 // indirect
 	github.com/mailgun/raymond/v2 v2.0.48 // indirect
 	github.com/mailru/easyjson v0.9.1 // indirect
@@ -179,7 +187,6 @@ require (
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/pquerna/otp v1.5.0 // indirect
-	github.com/prometheus/client_golang v1.23.2 // indirect
 	github.com/prometheus/client_model v0.6.2 // indirect
 	github.com/prometheus/common v0.67.5 // indirect
 	github.com/prometheus/procfs v0.20.0 // indirect
@@ -207,6 +214,7 @@ require (
 	github.com/vmihailenco/msgpack/v5 v5.4.1 // indirect
 	github.com/vmihailenco/tagparser/v2 v2.0.0 // indirect
 	github.com/vultr/govultr/v2 v2.17.2 // indirect
+	github.com/xhit/go-str2duration/v2 v2.1.0 // indirect
 	github.com/yosssi/ace v0.0.5 // indirect
 	github.com/youmark/pkcs8 v0.0.0-20240726163527-a2c0da244d78 // indirect
 	go.mongodb.org/mongo-driver v1.17.9 // indirect
@@ -216,7 +224,6 @@ require (
 	go.opentelemetry.io/otel v1.40.0 // indirect
 	go.opentelemetry.io/otel/metric v1.40.0 // indirect
 	go.opentelemetry.io/otel/trace v1.40.0 // indirect
-	go.uber.org/mock v0.6.0 // indirect
 	go.uber.org/ratelimit v0.3.1 // indirect
 	go.yaml.in/yaml/v2 v2.4.3 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect

go.sum

@@ -62,6 +62,10 @@ github.com/ajg/form v1.5.1/go.mod h1:uL1WgH+h2mgNtvBq0339dVnzXdBETtL2LeUXaIv25UY
 github.com/ajstarks/svgo v0.0.0-20180226025133-644b8db467af/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw=
 github.com/akamai/AkamaiOPEN-edgegrid-golang/v12 v12.3.0 h1:iGVPe/gPqzpXggbbmVLWR0TyJ9UoPoqKL+kspjseZzE=
 github.com/akamai/AkamaiOPEN-edgegrid-golang/v12 v12.3.0/go.mod h1:76JtkiCKMwTdTOlKe9goT4Md+oWjfMouGBQgy+u1bgc=
+github.com/alecthomas/kingpin/v2 v2.4.0 h1:f48lwail6p8zpO1bC4TxtqACaGqHYA22qkHjHpqDjYY=
+github.com/alecthomas/kingpin/v2 v2.4.0/go.mod h1:0gyi0zQnjuFk8xrkNKamJoyUo382HRL7ATRpFZCw6tE=
+github.com/alecthomas/units v0.0.0-20240927000941-0f3dac36c52b h1:mimo19zliBX/vSQ6PWWSL9lK8qwHozUj03+zLoEB8O0=
+github.com/alecthomas/units v0.0.0-20240927000941-0f3dac36c52b/go.mod h1:fvzegU4vN3H1qMT+8wDmzjAcDONcgo2/SZ/TyfdUOFs=
 github.com/aliyun/alibaba-cloud-sdk-go v1.63.107 h1:qagvUyrgOnBIlVRQWOyCZGVKUIYbMBdGdJ104vBpRFU=
 github.com/aliyun/alibaba-cloud-sdk-go v1.63.107/go.mod h1:SOSDHfe1kX91v3W5QiBsWSLqeLxImobbMX1mxrFHsVQ=
 github.com/altcha-org/altcha-lib-go v1.0.0 h1:7oPti0aUS+YCep8nwt5b9g4jYfCU55ZruWESL8G9K5M=
@@ -218,8 +222,6 @@ github.com/gin-contrib/sessions v1.0.4 h1:ha6CNdpYiTOK/hTp05miJLbpTSNfOnFg5Jm2kb
 github.com/gin-contrib/sessions v1.0.4/go.mod h1:ccmkrb2z6iU2osiAHZG3x3J4suJK+OU27oqzlWOqQgs=
 github.com/gin-contrib/sse v1.1.0 h1:n0w2GMuUpWDVp7qSpvze6fAu9iRxJY4Hmj6AmBOU05w=
 github.com/gin-contrib/sse v1.1.0/go.mod h1:hxRZ5gVpWMT7Z0B0gSNYqqsSCNIJMjzvm6fqCz9vjwM=
-github.com/gin-gonic/gin v1.11.0 h1:OW/6PLjyusp2PPXtyxKHU0RbX6I/l28FTdDlae5ueWk=
-github.com/gin-gonic/gin v1.11.0/go.mod h1:+iq/FyxlGzII0KHiBGjuNn4UNENUlKbGlNmc+W50Dls=
 github.com/gin-gonic/gin v1.12.0 h1:b3YAbrZtnf8N//yjKeU2+MQsh2mY5htkZidOM7O0wG8=
 github.com/gin-gonic/gin v1.12.0/go.mod h1:VxccKfsSllpKshkBWgVgRniFFAzFb9csfngsqANjnLc=
 github.com/go-gandi/go-gandi v0.7.0 h1:gsP33dUspsN1M+ZW9HEgHchK9HiaSkYnltO73RHhSZA=
@@ -432,6 +434,12 @@ github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
 github.com/leodido/go-urn v1.4.0/go.mod h1:bvxc+MVxLKB4z00jd1z+Dvzr47oO32F/QSNjSBOlFxI=
 github.com/lib/pq v1.11.2 h1:x6gxUeu39V0BHZiugWe8LXZYZ+Utk7hSJGThs8sdzfs=
 github.com/lib/pq v1.11.2/go.mod h1:/p+8NSbOcwzAEI7wiMXFlgydTwcgTr3OSKMsD2BitpA=
+github.com/likexian/gokit v0.25.16 h1:wwBeUIN/OdoPp6t00xTnZE8Di/+s969Bl5N2Kw6bzP8=
+github.com/likexian/gokit v0.25.16/go.mod h1:Wqd4f+iifV0qxA1N3MqePJTUsmRy/lpst9/yXriDx/4=
+github.com/likexian/whois v1.15.7 h1:sajjDhi2bVD71AHJhjV7jLYxN92H4AWhTwxM8hmj7c0=
+github.com/likexian/whois v1.15.7/go.mod h1:kdPQtYb+7SQVftBEbCblDadUkycN7Mg1k1/Li/rwvmc=
+github.com/likexian/whois-parser v1.24.21 h1:MxsrGRxDOiZIVp7q7N/yAIbKuN4QAkGjCpOtTDA5OsM=
+github.com/likexian/whois-parser v1.24.21/go.mod h1:o3DUruO65Pb8WXCJCTlSVkTbwuYVrBCeoMTw2q0mxY4=
 github.com/luadns/luadns-go v0.3.0 h1:mN2yhFv/LnGvPw/HmvYUhXe+lc95oXUqjlYVeJeOJng=
 github.com/luadns/luadns-go v0.3.0/go.mod h1:DmPXbrGMpynq1YNDpvgww3NP5Zf4wXM5raAbGrp5L+8=
 github.com/mailgun/raymond/v2 v2.0.48 h1:5dmlB680ZkFG2RN/0lvTAghrSxIESeu9/2aeDqACtjw=
@@ -484,6 +492,8 @@ github.com/onsi/ginkgo/v2 v2.23.3/go.mod h1:zXTP6xIp3U8aVuXN8ENK9IXRaTjFnpVB9mGm
 github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
 github.com/onsi/gomega v1.37.0 h1:CdEG8g0S133B4OswTDC/5XPSzE1OeP29QOioj2PID2Y=
 github.com/onsi/gomega v1.37.0/go.mod h1:8D9+Txp43QWKhM24yyOBEdpkzN8FvJyAwecBgsU4KU0=
+github.com/openrdap/rdap v0.9.1 h1:Rv6YbanbiVPsKRvOLdUmlU1AL5+2OFuEFLjFN+mQsCM=
+github.com/openrdap/rdap v0.9.1/go.mod h1:vKSiotbsENrjM/vaHXLddXbW8iQkBfa+ldEuYEjyLTQ=
 github.com/opentracing/opentracing-go v1.2.1-0.20220228012449-10b1cf09e00b h1:FfH+VrHHk6Lxt9HdVS0PXzSXFyS2NbZKXv33FYPol0A=
 github.com/opentracing/opentracing-go v1.2.1-0.20220228012449-10b1cf09e00b/go.mod h1:AC62GU6hc0BrNm+9RK9VSiwa/EUe1bkIeFORAMcHvJU=
 github.com/oracle/nosql-go-sdk v1.4.7 h1:dqVBSMulObDj0JHm1mAncTHrQg8wIiQJNC0JRNKPACg=
@@ -509,6 +519,8 @@ github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRI
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/pquerna/otp v1.5.0 h1:NMMR+WrmaqXU4EzdGJEE1aUUI0AMRzsp96fFFWNPwxs=
 github.com/pquerna/otp v1.5.0/go.mod h1:dkJfzwRKNiegxyNb54X/3fLwhCynbMspSyWKnvi1AEg=
+github.com/prometheus-community/pro-bing v0.8.0 h1:CEY/g1/AgERRDjxw5P32ikcOgmrSuXs7xon7ovx6mNc=
+github.com/prometheus-community/pro-bing v0.8.0/go.mod h1:Idyxz8raDO6TgkUN6ByiEGvWJNyQd40kN9ZUeho3lN0=
 github.com/prometheus/client_golang v1.23.2 h1:Je96obch5RDVy3FDMndoUsjAhG5Edi49h0RJWRi/o0o=
 github.com/prometheus/client_golang v1.23.2/go.mod h1:Tb1a6LWHB3/SPIzCoaDXI4I8UHKeFTEQ1YCr+0Gyqmg=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
@@ -571,6 +583,7 @@ github.com/stretchr/testify v1.7.2/go.mod h1:R6va5+xMeoiuVRoj+gSkQ7d3FALtqAAGI1F
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
@@ -623,6 +636,8 @@ github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 h1:EzJWgHo
 github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415/go.mod h1:GwrjFmJcFw6At/Gs6z4yjiIwzuJ1/+UwLxMQDVQXShQ=
 github.com/xeipuuv/gojsonschema v1.2.0 h1:LhYJRs+L4fBtjZUfuSZIKGeVu0QRy8e5Xi7D17UxZ74=
 github.com/xeipuuv/gojsonschema v1.2.0/go.mod h1:anYRn/JVcOK2ZgGU+IjEV4nwlhoK5sQluxsYJ78Id3Y=
+github.com/xhit/go-str2duration/v2 v2.1.0 h1:lxklc02Drh6ynqX+DdPyp5pCKLUQpRT8bp8Ydu2Bstc=
+github.com/xhit/go-str2duration/v2 v2.1.0/go.mod h1:ohY8p+0f07DiV6Em5LKB0s2YpLtXVyJfNt1+BlmyAsU=
 github.com/xyproto/randomstring v1.0.5 h1:YtlWPoRdgMu3NZtP45drfy1GKoojuR7hmRcnhZqKjWU=
 github.com/xyproto/randomstring v1.0.5/go.mod h1:rgmS5DeNXLivK7YprL0pY+lTuhNQW3iGxZ18UQApw/E=
 github.com/yalp/jsonpath v0.0.0-20180802001716-5cc68e5049a0 h1:6fRhSjgLCkTD3JnJxvaJ4Sj+TYblw757bqYgZaOq5ZY=
@@ -732,8 +747,6 @@ golang.org/x/net v0.15.0/go.mod h1:idbUs1IY1+zTqbi8yxTbhexhEEk5ur9LInksu6HrEpk=
 golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
 golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
 golang.org/x/net v0.33.0/go.mod h1:HXLR5J+9DxmrqMwG9qjGCxZ+zKXxBru04zlTvWlWuN4=
-golang.org/x/net v0.50.0 h1:ucWh9eiCGyDR3vtzso0WMQinm2Dnt8cFMuQa9K33J60=
-golang.org/x/net v0.50.0/go.mod h1:UgoSli3F/pBgdJBHCTc+tp3gmrU4XswgGRgtnwWTfyM=
 golang.org/x/net v0.51.0 h1:94R/GTO7mt3/4wIKpcR5gkGmRLOuE/2hNGeWq/GBIFo=
 golang.org/x/net v0.51.0/go.mod h1:aamm+2QF5ogm02fjy5Bb7CQ0WMt1/WVM7FtyaTLlA9Y=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=

internal/adapters/dnscontrol-providers.go

@@ -26,11 +26,13 @@ import (
 	"errors"
 	"fmt"
 	"strings"
+	"time"
 
 	"github.com/StackExchange/dnscontrol/v4/models"
 	dnscontrol "github.com/StackExchange/dnscontrol/v4/pkg/providers"
 	"github.com/miekg/dns"
 
+	"git.happydns.org/happyDomain/internal/metrics"
 	"git.happydns.org/happyDomain/model"
 )
 
@@ -150,7 +152,11 @@ func NewDNSControlProviderAdapter(configAdapter DNSControlConfigAdapter) (ret ha
 		auditor = p.RecordAuditor
 	}
 
-	return &DNSControlAdapterNSProvider{provider, auditor}, nil
+	return &DNSControlAdapterNSProvider{
+		DNSServiceProvider: provider,
+		RecordAuditor:      auditor,
+		providerName:       configAdapter.DNSControlName(),
+	}, nil
 }
 
 // DNSControlAdapterNSProvider wraps a DNSControl provider to implement the happyDomain ProviderActuator interface.
@@ -160,6 +166,8 @@ type DNSControlAdapterNSProvider struct {
 	DNSServiceProvider dnscontrol.DNSServiceProvider
 	// RecordAuditor validates records for provider-specific requirements
 	RecordAuditor dnscontrol.RecordAuditor
+	// providerName is the DNSControl provider name used for metrics labels
+	providerName string
 }
 
 // CanListZones checks if the provider supports listing zones (domains).
@@ -182,10 +190,17 @@ func (p *DNSControlAdapterNSProvider) CanCreateDomain() bool {
 func (p *DNSControlAdapterNSProvider) GetZoneRecords(domain string) (ret []happydns.Record, err error) {
 	var records models.Records
 
+	start := time.Now()
 	defer func() {
 		if a := recover(); a != nil {
 			err = fmt.Errorf("%s", a)
 		}
+		status := "success"
+		if err != nil {
+			status = "error"
+		}
+		metrics.ProviderAPICallsTotal.WithLabelValues(p.providerName, "get_zone_records", status).Inc()
+		metrics.ProviderAPIDuration.WithLabelValues(p.providerName, "get_zone_records").Observe(time.Since(start).Seconds())
 	}()
 
 	records, err = p.DNSServiceProvider.GetZoneRecords(strings.TrimSuffix(domain, "."), nil)
@@ -205,6 +220,16 @@ func (p *DNSControlAdapterNSProvider) GetZoneRecords(domain string) (ret []happy
 // before computing corrections.
 // Returns a slice of corrections, the total number of corrections needed, and any error.
 func (p *DNSControlAdapterNSProvider) GetZoneCorrections(domain string, rrs []happydns.Record) (ret []*happydns.Correction, nbCorrections int, err error) {
+	start := time.Now()
+	defer func() {
+		status := "success"
+		if err != nil {
+			status = "error"
+		}
+		metrics.ProviderAPICallsTotal.WithLabelValues(p.providerName, "get_zone_corrections", status).Inc()
+		metrics.ProviderAPIDuration.WithLabelValues(p.providerName, "get_zone_corrections").Observe(time.Since(start).Seconds())
+	}()
+
 	var dc *models.DomainConfig
 	dc, err = NewDNSControlDomainConfig(strings.TrimSuffix(domain, "."), rrs)
 	if err != nil {
@@ -255,23 +280,47 @@ func (p *DNSControlAdapterNSProvider) GetZoneCorrections(domain string, rrs []ha
 // CreateDomain creates a new zone (domain) on the provider.
 // The fqdn parameter should be a fully qualified domain name (with or without trailing dot).
 // Returns an error if the provider doesn't support domain creation or if creation fails.
-func (p *DNSControlAdapterNSProvider) CreateDomain(fqdn string) error {
+func (p *DNSControlAdapterNSProvider) CreateDomain(fqdn string) (err error) {
+	start := time.Now()
+	defer func() {
+		status := "success"
+		if err != nil {
+			status = "error"
+		}
+		metrics.ProviderAPICallsTotal.WithLabelValues(p.providerName, "create_domain", status).Inc()
+		metrics.ProviderAPIDuration.WithLabelValues(p.providerName, "create_domain").Observe(time.Since(start).Seconds())
+	}()
+
 	zc, ok := p.DNSServiceProvider.(dnscontrol.ZoneCreator)
 	if !ok {
-		return fmt.Errorf("Provider doesn't support domain creation.")
+		err = fmt.Errorf("Provider doesn't support domain creation.")
+		return
 	}
 
-	return zc.EnsureZoneExists(strings.TrimSuffix(fqdn, "."), nil)
+	err = zc.EnsureZoneExists(strings.TrimSuffix(fqdn, "."), nil)
+	return
 }
 
 // ListZones retrieves a list of all zones (domains) managed by this provider.
 // Returns a slice of domain names or an error if the provider doesn't support listing
 // or if the operation fails.
-func (p *DNSControlAdapterNSProvider) ListZones() ([]string, error) {
+func (p *DNSControlAdapterNSProvider) ListZones() (zones []string, err error) {
+	start := time.Now()
+	defer func() {
+		status := "success"
+		if err != nil {
+			status = "error"
+		}
+		metrics.ProviderAPICallsTotal.WithLabelValues(p.providerName, "list_zones", status).Inc()
+		metrics.ProviderAPIDuration.WithLabelValues(p.providerName, "list_zones").Observe(time.Since(start).Seconds())
+	}()
+
 	zl, ok := p.DNSServiceProvider.(dnscontrol.ZoneLister)
 	if !ok {
-		return nil, fmt.Errorf("Provider doesn't support domain listing.")
+		err = fmt.Errorf("Provider doesn't support domain listing.")
+		return
 	}
 
-	return zl.ListZones()
+	zones, err = zl.ListZones()
+	return
 }

internal/api-admin/controller/check_controller.go

@@ -0,0 +1,211 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package controller
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	apicontroller "git.happydns.org/happyDomain/internal/api/controller"
+	"git.happydns.org/happyDomain/model"
+)
+
+// CheckerController handles admin-level operations.
+// All methods in this controller work with admin-scoped options (nil user/domain/service IDs).
+type CheckerController struct {
+	*apicontroller.BaseCheckerController
+}
+
+func NewCheckerController(checkerService happydns.CheckerUsecase) *CheckerController {
+	return &CheckerController{
+		BaseCheckerController: apicontroller.NewBaseCheckerController(checkerService),
+	}
+}
+
+// CheckerHandler is a middleware that retrieves a check by name and sets it in the context.
+func (uc *CheckerController) CheckerHandler(c *gin.Context) {
+	cname := c.Param("cname")
+
+	checker, err := uc.BaseCheckerController.GetCheckerService().GetChecker(cname)
+	if err != nil {
+		c.AbortWithStatusJSON(http.StatusNotFound, happydns.ErrorResponse{Message: "Check not found"})
+		return
+	}
+
+	c.Set("checker", checker)
+
+	c.Next()
+}
+
+// CheckerOptionHandler is a middleware that retrieves a specific option and sets it in the context.
+func (uc *CheckerController) CheckerOptionHandler(c *gin.Context) {
+	cname := c.Param("cname")
+	optname := c.Param("optname")
+
+	opts, err := uc.BaseCheckerController.GetCheckerService().GetCheckerOptions(cname, nil, nil, nil)
+	if err != nil {
+		c.AbortWithStatusJSON(http.StatusInternalServerError, happydns.ErrorResponse{Message: err.Error()})
+		return
+	}
+
+	c.Set("option", (*opts)[optname])
+
+	c.Next()
+}
+
+// ListCheckers retrieves all available checks.
+//
+//	@Summary		List checkers (admin)
+//	@Schemes
+//	@Description	Returns a list of all available checks with their version information.
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Success		200	{object}	map[string]happydns.CheckerResponse	"Map of checker names to info"
+//	@Failure		500	{object}	happydns.ErrorResponse					"Internal server error"
+//	@Router			/checks [get]
+func (uc *CheckerController) ListCheckers(c *gin.Context) {
+	uc.BaseCheckerController.ListCheckers(c)
+}
+
+// GetCheckerStatus retrieves the status and available options for a check.
+//
+//	@Summary		Get check info
+//	@Schemes
+//	@Description	Retrieves the status information and available options for a specific checker.
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Param			cname	path		string	true	"Checker name"
+//	@Success		200		{object}	happydns.CheckerResponse	"Checker status with version info and available options"
+//	@Failure		404		{object}	happydns.ErrorResponse	"Checker not found"
+//	@Router			/checks/{cname} [get]
+func (uc *CheckerController) GetCheckerStatus(c *gin.Context) {
+	uc.BaseCheckerController.GetCheckerStatus(c)
+}
+
+// GetCheckerOptions retrieves all options for a check.
+//
+//	@Summary		Get check options (admin)
+//	@Schemes
+//	@Description	Retrieves all configuration options for a specific check.
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Param			cname	path		string	true	"Checker name"
+//	@Success		200		{object}	happydns.CheckerOptions	"Checker options as key-value pairs"
+//	@Failure		404		{object}	happydns.ErrorResponse	"Checker not found"
+//	@Failure		500		{object}	happydns.ErrorResponse	"Internal server error"
+//	@Router			/checks/{cname}/options [get]
+func (uc *CheckerController) GetCheckerOptions(c *gin.Context) {
+	cname := c.Param("cname")
+
+	// Get admin-level options (nil user/domain/service IDs)
+	uc.GetCheckerOptionsWithScope(c, cname, nil, nil, nil)
+}
+
+// AddCheckerOptions adds or overwrites specific admin-level options for a check.
+//
+//	@Summary		Add checker options
+//	@Schemes
+//	@Description	Adds or overwrites specific configuration options for a checker without affecting other options.
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Param			cname	path		string								true	"Checker name"
+//	@Param			body	body		happydns.SetCheckerOptionsRequest	true	"Options to add or overwrite"
+//	@Success		200		{object}	bool								"Success status"
+//	@Failure		400		{object}	happydns.ErrorResponse				"Invalid request body"
+//	@Failure		404		{object}	happydns.ErrorResponse				"Checker not found"
+//	@Failure		500		{object}	happydns.ErrorResponse				"Internal server error"
+//	@Router			/checks/{cname}/options [post]
+func (uc *CheckerController) AddCheckerOptions(c *gin.Context) {
+	cname := c.Param("cname")
+
+	// Add admin-level options (nil user/domain/service IDs)
+	uc.AddCheckerOptionsWithScope(c, cname, nil, nil, nil)
+}
+
+// ChangeCheckerOptions replaces all options for a checker.
+//
+//	@Summary		Replace checker options (admin)
+//	@Schemes
+//	@Description	Replaces all configuration options for a check with the provided options.
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Param			cname	path		string								true	"Checker name"
+//	@Param			body	body		happydns.SetCheckerOptionsRequest	true	"New complete set of options"
+//	@Success		200		{object}	bool								"Success status"
+//	@Failure		400		{object}	happydns.ErrorResponse				"Invalid request body"
+//	@Failure		404		{object}	happydns.ErrorResponse				"Checker not found"
+//	@Failure		500		{object}	happydns.ErrorResponse				"Internal server error"
+//	@Router			/checks/{cname}/options [put]
+func (uc *CheckerController) ChangeCheckerOptions(c *gin.Context) {
+	cname := c.Param("cname")
+
+	// Replace admin-level options (nil user/domain/service IDs)
+	uc.ChangeCheckerOptionsWithScope(c, cname, nil, nil, nil)
+}
+
+// GetCheckerOption retrieves a specific option value for a checker.
+//
+//	@Summary		Get checker option (admin)
+//	@Schemes
+//	@Description	Retrieves the value of a specific configuration option for a checker.
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Param			cname		path		string	true	"Checker name"
+//	@Param			optname		path		string	true	"Option name"
+//	@Success		200			{object}	object	"Option value (type varies)"
+//	@Failure		404			{object}	happydns.ErrorResponse	"Checker not found"
+//	@Failure		500			{object}	happydns.ErrorResponse	"Internal server error"
+//	@Router			/checks/{cname}/options/{optname} [get]
+func (uc *CheckerController) GetCheckerOption(c *gin.Context) {
+	uc.GetCheckerOptionValue(c)
+}
+
+// SetCheckerOption sets or updates a specific option value for a checker.
+//
+//	@Summary		Set checker option (admin)
+//	@Schemes
+//	@Description	Sets or updates the value of a specific configuration option for a checker.
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Param			cname		path		string	true	"Checker name"
+//	@Param			optname		path		string	true	"Option name"
+//	@Param			body		body		object	true	"Option value (type varies by option)"
+//	@Success		200			{object}	bool	"Success status"
+//	@Failure		400			{object}	happydns.ErrorResponse	"Invalid request body"
+//	@Failure		404			{object}	happydns.ErrorResponse	"Checker not found"
+//	@Failure		500			{object}	happydns.ErrorResponse	"Internal server error"
+//	@Router			/checks/{cname}/options/{optname} [put]
+func (uc *CheckerController) SetCheckerOption(c *gin.Context) {
+	cname := c.Param("cname")
+	optname := c.Param("optname")
+
+	// Set admin-level option (nil user/domain/service IDs)
+	uc.SetCheckerOptionWithScope(c, cname, optname, nil, nil, nil)
+}

internal/api-admin/controller/domain_controller.go

@@ -74,7 +74,7 @@ func NewDomainController(
 func (dc *DomainController) ListDomains(c *gin.Context) {
 	user := middleware.MyUser(c)
 	if user != nil {
-		apidc := controller.NewDomainController(dc.domainService, dc.remoteZoneImporter, dc.zoneImporter)
+		apidc := controller.NewDomainController(dc.domainService, dc.remoteZoneImporter, dc.zoneImporter, nil)
 		apidc.GetDomains(c)
 		return
 	}

internal/api-admin/controller/scheduler_controller.go

@@ -0,0 +1,102 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package controller
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"git.happydns.org/happyDomain/model"
+)
+
+// AdminSchedulerController handles admin operations on the test scheduler
+type AdminSchedulerController struct {
+	scheduler happydns.SchedulerUsecase
+}
+
+func NewAdminSchedulerController(scheduler happydns.SchedulerUsecase) *AdminSchedulerController {
+	return &AdminSchedulerController{scheduler: scheduler}
+}
+
+// GetSchedulerStatus returns the current scheduler state
+//
+//	@Summary		Get scheduler status
+//	@Description	Returns the current state of the test scheduler including worker count, queue size, and upcoming schedules
+//	@Tags			scheduler
+//	@Produce		json
+//	@Success		200	{object}	happydns.SchedulerStatus
+//	@Router			/scheduler [get]
+func (ctrl *AdminSchedulerController) GetSchedulerStatus(c *gin.Context) {
+	c.JSON(http.StatusOK, ctrl.scheduler.GetSchedulerStatus())
+}
+
+// EnableScheduler enables the test scheduler at runtime
+//
+//	@Summary		Enable scheduler
+//	@Description	Enables the test scheduler at runtime without restarting the server
+//	@Tags			scheduler
+//	@Success		200	{object}	happydns.SchedulerStatus
+//	@Failure		500	{object}	happydns.ErrorResponse
+//	@Router			/scheduler/enable [post]
+func (ctrl *AdminSchedulerController) EnableScheduler(c *gin.Context) {
+	if err := ctrl.scheduler.SetEnabled(true); err != nil {
+		c.JSON(http.StatusInternalServerError, happydns.ErrorResponse{Message: err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, ctrl.scheduler.GetSchedulerStatus())
+}
+
+// DisableScheduler disables the test scheduler at runtime
+//
+//	@Summary		Disable scheduler
+//	@Description	Disables the test scheduler at runtime without restarting the server
+//	@Tags			scheduler
+//	@Success		200	{object}	happydns.SchedulerStatus
+//	@Failure		500	{object}	happydns.ErrorResponse
+//	@Router			/scheduler/disable [post]
+func (ctrl *AdminSchedulerController) DisableScheduler(c *gin.Context) {
+	if err := ctrl.scheduler.SetEnabled(false); err != nil {
+		c.JSON(http.StatusInternalServerError, happydns.ErrorResponse{Message: err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, ctrl.scheduler.GetSchedulerStatus())
+}
+
+// RescheduleUpcoming randomizes the next run time of all enabled schedules
+// within their respective intervals to spread load evenly.
+//
+//	@Summary		Reschedule upcoming tests
+//	@Description	Randomizes the next run time of all enabled schedules within their intervals to spread load
+//	@Tags			scheduler
+//	@Produce		json
+//	@Success		200	{object}	map[string]int
+//	@Failure		500	{object}	happydns.ErrorResponse
+//	@Router			/scheduler/reschedule-upcoming [post]
+func (ctrl *AdminSchedulerController) RescheduleUpcoming(c *gin.Context) {
+	n, err := ctrl.scheduler.RescheduleUpcomingChecks()
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, happydns.ErrorResponse{Message: err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"rescheduled": n})
+}

internal/api-admin/controller/zone_controller.go

@@ -128,7 +128,7 @@ func (zc *ZoneController) DeleteZone(c *gin.Context) {
 //	@Router			/users/{uid}/domains/{domain}/zones/{zoneid} [get]
 //	@Router			/users/{uid}/providers/{pid}/domains/{domain}/zones/{zoneid} [get]
 func (zc *ZoneController) GetZone(c *gin.Context) {
-	apizc := controller.NewZoneController(zc.zoneService, zc.domainService, zc.zoneCorrectionService)
+	apizc := controller.NewZoneController(zc.zoneService, zc.domainService, zc.zoneCorrectionService, nil)
 	apizc.GetZone(c)
 }
 

internal/api-admin/route/check.go

@@ -0,0 +1,51 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package route
+
+import (
+	"github.com/gin-gonic/gin"
+
+	"git.happydns.org/happyDomain/internal/api-admin/controller"
+)
+
+func declareChecksRoutes(router *gin.RouterGroup, dep Dependencies) {
+	cc := controller.NewCheckerController(dep.Checker)
+
+	apiChecksRoutes := router.Group("/checks")
+
+	apiChecksRoutes.GET("", cc.ListCheckers)
+
+	apiCheckerRoutes := apiChecksRoutes.Group("/:cname")
+	apiCheckerRoutes.Use(cc.CheckerHandler)
+
+	apiCheckerRoutes.GET("", cc.GetCheckerStatus)
+	//apiCheckerRoutes.POST("", tpc.ChangeCheckerStatus)
+
+	apiCheckerRoutes.GET("/options", cc.GetCheckerOptions)
+	apiCheckerRoutes.POST("/options", cc.AddCheckerOptions)
+	apiCheckerRoutes.PUT("/options", cc.ChangeCheckerOptions)
+
+	apiCheckerOptionsRoutes := apiCheckerRoutes.Group("/options/:optname")
+	apiCheckerOptionsRoutes.Use(cc.CheckerOptionHandler)
+	apiCheckerOptionsRoutes.GET("", cc.GetCheckerOption)
+	apiCheckerOptionsRoutes.PUT("", cc.SetCheckerOption)
+}

internal/api-admin/route/route.go

@@ -32,6 +32,8 @@ import (
 // Dependencies holds all use cases required to register the admin API routes.
 type Dependencies struct {
 	AuthUser              happydns.AuthUserUsecase
+	Checker               happydns.CheckerUsecase
+	CheckScheduler        happydns.SchedulerUsecase
 	Domain                happydns.DomainUsecase
 	Provider              happydns.ProviderUsecase
 	RemoteZoneImporter    happydns.RemoteZoneImporterUsecase
@@ -48,7 +50,9 @@ func DeclareRoutes(cfg *happydns.Options, router *gin.Engine, s storage.Storage,
 
 	declareBackupRoutes(cfg, apiRoutes, s)
 	declareDomainRoutes(apiRoutes, dep, s)
+	declareChecksRoutes(apiRoutes, dep)
 	declareProviderRoutes(apiRoutes, dep, s)
+	declareSchedulerRoutes(apiRoutes, dep)
 	declareSessionsRoutes(cfg, apiRoutes, s)
 	declareUserAuthsRoutes(apiRoutes, dep, s)
 	declareUsersRoutes(apiRoutes, dep, s)

internal/api-admin/route/scheduler.go

@@ -0,0 +1,38 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package route
+
+import (
+	"github.com/gin-gonic/gin"
+
+	"git.happydns.org/happyDomain/internal/api-admin/controller"
+)
+
+func declareSchedulerRoutes(router *gin.RouterGroup, dep Dependencies) {
+	ctrl := controller.NewAdminSchedulerController(dep.CheckScheduler)
+
+	schedulerRoute := router.Group("/scheduler")
+	schedulerRoute.GET("", ctrl.GetSchedulerStatus)
+	schedulerRoute.POST("/enable", ctrl.EnableScheduler)
+	schedulerRoute.POST("/disable", ctrl.DisableScheduler)
+	schedulerRoute.POST("/reschedule-upcoming", ctrl.RescheduleUpcoming)
+}

internal/api/controller/check_base_controller.go

@@ -0,0 +1,170 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2025 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package controller
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"git.happydns.org/happyDomain/checks"
+	"git.happydns.org/happyDomain/internal/api/middleware"
+	"git.happydns.org/happyDomain/model"
+)
+
+// BaseCheckerController contains shared functionality for check controllers.
+// It provides common methods that can be used by both admin and user-scoped controllers.
+type BaseCheckerController struct {
+	checkerService happydns.CheckerUsecase
+}
+
+func NewBaseCheckerController(checkerService happydns.CheckerUsecase) *BaseCheckerController {
+	return &BaseCheckerController{
+		checkerService,
+	}
+}
+
+// GetCheckerService returns the check service for use by derived controllers.
+func (bc *BaseCheckerController) GetCheckerService() happydns.CheckerUsecase {
+	return bc.checkerService
+}
+
+// ListCheckers retrieves all available checks.
+func (bc *BaseCheckerController) ListCheckers(c *gin.Context) {
+	checkers, err := bc.checkerService.ListCheckers()
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	res := map[string]happydns.CheckerResponse{}
+
+	for name, checker := range *checkers {
+		_, hasHTML := checker.(happydns.CheckerHTMLReporter)
+		_, hasMetrics := checker.(happydns.CheckerMetricsReporter)
+		res[name] = happydns.CheckerResponse{
+			ID:            name,
+			Name:          checker.Name(),
+			Availability:  checker.Availability(),
+			Options:       checker.Options(),
+			Interval:      checks.GetCheckInterval(checker),
+			HasHTMLReport: hasHTML,
+			HasMetrics:    hasMetrics,
+		}
+	}
+
+	happydns.ApiResponse(c, res, nil)
+}
+
+// GetCheckerStatus retrieves the status and available options for a check.
+func (bc *BaseCheckerController) GetCheckerStatus(c *gin.Context) {
+	checker := c.MustGet("checker").(happydns.Checker)
+
+	_, hasHTML := checker.(happydns.CheckerHTMLReporter)
+	_, hasMetrics := checker.(happydns.CheckerMetricsReporter)
+	c.JSON(http.StatusOK, happydns.CheckerResponse{
+		ID:            checker.ID(),
+		Name:          checker.Name(),
+		Availability:  checker.Availability(),
+		Options:       checker.Options(),
+		Interval:      checks.GetCheckInterval(checker),
+		HasHTMLReport: hasHTML,
+		HasMetrics:    hasMetrics,
+	})
+}
+
+// getDomainAndServiceIDFromContext extracts optional domainID and serviceID from the gin context.
+func getDomainAndServiceIDFromContext(c *gin.Context) (domainID *happydns.Identifier, serviceID *happydns.Identifier) {
+	if dn, ok := c.Get("domain"); ok {
+		domainID = &dn.(*happydns.Domain).Id
+	}
+	if svcid, ok := c.Get("serviceid"); ok {
+		tmp := svcid.(happydns.Identifier)
+		serviceID = &tmp
+	}
+	return
+}
+
+// GetCheckerOptionsWithScope retrieves all options for a check with the given scope.
+func (bc *BaseCheckerController) GetCheckerOptionsWithScope(c *gin.Context, cname string, userId *happydns.Identifier, domainId *happydns.Identifier, serviceId *happydns.Identifier) {
+	opts, err := bc.checkerService.GetCheckerOptions(cname, userId, domainId, serviceId)
+
+	// For non-basic type, stringify
+	if opts != nil {
+		for i, opt := range *opts {
+			if svc, ok := opt.(*happydns.ServiceMessage); ok {
+				(*opts)[i] = svc.Type + ": " + svc.Comment
+			}
+		}
+	}
+
+	happydns.ApiResponse(c, opts, err)
+}
+
+// AddCheckerOptionsWithScope adds or overwrites specific options for a check with the given scope.
+func (bc *BaseCheckerController) AddCheckerOptionsWithScope(c *gin.Context, cname string, userId *happydns.Identifier, domainId *happydns.Identifier, serviceId *happydns.Identifier) {
+	var req happydns.SetCheckerOptionsRequest
+	err := c.ShouldBindJSON(&req)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusBadRequest, err)
+		return
+	}
+
+	err = bc.checkerService.OverwriteSomeCheckerOptions(cname, userId, domainId, serviceId, req.Options)
+	happydns.ApiResponse(c, true, err)
+}
+
+// ChangeCheckerOptionsWithScope replaces all options for a check with the given scope.
+func (bc *BaseCheckerController) ChangeCheckerOptionsWithScope(c *gin.Context, cname string, userId *happydns.Identifier, domainId *happydns.Identifier, serviceId *happydns.Identifier) {
+	var req happydns.SetCheckerOptionsRequest
+	err := c.ShouldBindJSON(&req)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusBadRequest, err)
+		return
+	}
+
+	err = bc.checkerService.SetCheckerOptions(cname, userId, domainId, serviceId, req.Options)
+	happydns.ApiResponse(c, true, err)
+}
+
+// GetCheckerOptionValue retrieves a specific option value from the context.
+func (bc *BaseCheckerController) GetCheckerOptionValue(c *gin.Context) {
+	opt := c.MustGet("option")
+
+	happydns.ApiResponse(c, opt, nil)
+}
+
+// SetCheckerOptionWithScope sets or updates a specific option value for a check with the given scope.
+func (bc *BaseCheckerController) SetCheckerOptionWithScope(c *gin.Context, cname string, optname string, userId *happydns.Identifier, domainId *happydns.Identifier, serviceId *happydns.Identifier) {
+	var req any
+	err := c.ShouldBindJSON(&req)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusBadRequest, err)
+		return
+	}
+
+	po := happydns.CheckerOptions{}
+	po[optname] = req
+
+	err = bc.checkerService.OverwriteSomeCheckerOptions(cname, userId, domainId, serviceId, po)
+	happydns.ApiResponse(c, true, err)
+}

internal/api/controller/check_controller.go

@@ -0,0 +1,247 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package controller
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"git.happydns.org/happyDomain/model"
+)
+
+// CheckerController handles user-scoped check operations for the main API.
+// All methods work with options scoped to the authenticated user.
+type CheckerController struct {
+	*BaseCheckerController
+}
+
+func NewCheckerController(checkerService happydns.CheckerUsecase) *CheckerController {
+	return &CheckerController{
+		BaseCheckerController: NewBaseCheckerController(checkerService),
+	}
+}
+
+// ListCheckers retrieves all available checks.
+//
+//	@Summary		List all checks
+//	@Schemes
+//	@Description	Returns a list of all available checks with their version information.
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Success		200	{object}	map[string]happydns.CheckerResponse	"Map of check names to version info"
+//	@Failure		500	{object}	happydns.ErrorResponse					"Internal server error"
+//	@Router			/checks [get]
+func (uc *CheckerController) ListCheckers(c *gin.Context) {
+	uc.BaseCheckerController.ListCheckers(c)
+}
+
+// GetCheckerStatus retrieves the status and available options for a check.
+//
+//	@Summary		Get check status
+//	@Schemes
+//	@Description	Retrieves the status information and available options for a specific check.
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Param			cname	path		string	true	"Check name"
+//	@Success		200		{object}	happydns.CheckerResponse	"Check status with version info and available options"
+//	@Failure		404		{object}	happydns.ErrorResponse	"Check not found"
+//	@Router			/checks/{cname} [get]
+func (uc *CheckerController) GetCheckerStatus(c *gin.Context) {
+	uc.BaseCheckerController.GetCheckerStatus(c)
+}
+
+// CheckerHandler is a middleware that retrieves a check by name and sets it in the context.
+func (uc *CheckerController) CheckerHandler(c *gin.Context) {
+	cname := c.Param("cname")
+
+	check, err := uc.checkerService.GetChecker(cname)
+	if err != nil {
+		c.AbortWithStatusJSON(http.StatusNotFound, happydns.ErrorResponse{Message: "Check not found"})
+		return
+	}
+
+	c.Set("checker", check)
+
+	c.Next()
+}
+
+// CheckerOptionHandler is a middleware that retrieves a specific check option for the authenticated user and sets it in the context.
+func (uc *CheckerController) CheckerOptionHandler(c *gin.Context) {
+	user := c.MustGet("LoggedUser").(*happydns.User)
+	cname := c.Param("cname")
+	optname := c.Param("optname")
+
+	opts, err := uc.checkerService.GetCheckerOptions(cname, &user.Id, nil, nil)
+	if err != nil {
+		c.AbortWithStatusJSON(http.StatusInternalServerError, happydns.ErrorResponse{Message: err.Error()})
+		return
+	}
+
+	c.Set("option", (*opts)[optname])
+
+	c.Next()
+}
+
+// GetCheckerOptions retrieves all options for a check for the authenticated user.
+//
+//	@Summary		Get check options
+//	@Schemes
+//	@Description	Retrieves all configuration options for a specific check for the authenticated user.
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Param			cname			path		string	true	"Check name"
+//	@Param			domain		path		string	false	"Domain identifier"
+//	@Param			zoneid		path		string	false	"Zone identifier"
+//	@Param			subdomain	path		string	false	"Subdomain"
+//	@Param			serviceid	path		string	false	"Service identifier"
+//	@Success		200		{object}	happydns.CheckerOptions		"Check options as key-value pairs"
+//	@Failure		404		{object}	happydns.ErrorResponse	"Check not found"
+//	@Failure		500		{object}	happydns.ErrorResponse	"Internal server error"
+//	@Router			/checks/{cname}/options [get]
+//	@Router			/domains/{domain}/checks/{cname}/options [get]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname}/options [get]
+func (uc *CheckerController) GetCheckerOptions(c *gin.Context) {
+	user := c.MustGet("LoggedUser").(*happydns.User)
+	cname := c.Param("cname")
+
+	domainID, serviceID := getDomainAndServiceIDFromContext(c)
+
+	uc.GetCheckerOptionsWithScope(c, cname, &user.Id, domainID, serviceID)
+}
+
+// AddCheckerOptions adds or overwrites specific options for a check for the authenticated user.
+//
+//	@Summary		Add check options
+//	@Schemes
+//	@Description	Adds or overwrites specific configuration options for a check for the authenticated user without affecting other options.
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Param			cname			path		string									true	"Check name"
+//	@Param			domain		path		string									false	"Domain identifier"
+//	@Param			zoneid		path		string									false	"Zone identifier"
+//	@Param			subdomain	path		string									false	"Subdomain"
+//	@Param			serviceid	path		string									false	"Service identifier"
+//	@Param			body		body		happydns.SetCheckerOptionsRequest			true	"Options to add or overwrite"
+//	@Success		200		{object}	bool								"Success status"
+//	@Failure		400		{object}	happydns.ErrorResponse				"Invalid request body"
+//	@Failure		404		{object}	happydns.ErrorResponse				"Check not found"
+//	@Failure		500		{object}	happydns.ErrorResponse				"Internal server error"
+//	@Router			/checks/{cname}/options [post]
+//	@Router			/domains/{domain}/checks/{cname}/options [post]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname}/options [post]
+func (uc *CheckerController) AddCheckerOptions(c *gin.Context) {
+	user := c.MustGet("LoggedUser").(*happydns.User)
+	cname := c.Param("cname")
+
+	domainID, serviceID := getDomainAndServiceIDFromContext(c)
+
+	uc.AddCheckerOptionsWithScope(c, cname, &user.Id, domainID, serviceID)
+}
+
+// ChangeCheckerOptions replaces all options for a check for the authenticated user.
+//
+//	@Summary		Replace check options
+//	@Schemes
+//	@Description	Replaces all configuration options for a check for the authenticated user with the provided options.
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Param			cname			path		string									true	"Checker name"
+//	@Param			domain		path		string									false	"Domain identifier"
+//	@Param			zoneid		path		string									false	"Zone identifier"
+//	@Param			subdomain	path		string									false	"Subdomain"
+//	@Param			serviceid	path		string									false	"Service identifier"
+//	@Param			body		body		happydns.SetCheckerOptionsRequest			true	"New complete set of options"
+//	@Success		200		{object}	bool								"Success status"
+//	@Failure		400		{object}	happydns.ErrorResponse				"Invalid request body"
+//	@Failure		404		{object}	happydns.ErrorResponse				"Checker not found"
+//	@Failure		500		{object}	happydns.ErrorResponse				"Internal server error"
+//	@Router			/checks/{cname}/options [put]
+//	@Router			/domains/{domain}/checks/{cname}/options [put]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname}/options [put]
+func (uc *CheckerController) ChangeCheckerOptions(c *gin.Context) {
+	user := c.MustGet("LoggedUser").(*happydns.User)
+	cname := c.Param("cname")
+
+	domainID, serviceID := getDomainAndServiceIDFromContext(c)
+
+	uc.ChangeCheckerOptionsWithScope(c, cname, &user.Id, domainID, serviceID)
+}
+
+// GetCheckerOption retrieves a specific option value for a check for the authenticated user.
+//
+//	@Summary		Get check option
+//	@Schemes
+//	@Description	Retrieves the value of a specific configuration option for a check for the authenticated user.
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Param			cname			path		string	true	"Check name"
+//	@Param			optname		path		string	true	"Option name"
+//	@Param			domain		path		string	false	"Domain identifier"
+//	@Param			zoneid		path		string	false	"Zone identifier"
+//	@Param			subdomain	path		string	false	"Subdomain"
+//	@Param			serviceid	path		string	false	"Service identifier"
+//	@Success		200			{object}	object	"Option value (type varies)"
+//	@Failure		404			{object}	happydns.ErrorResponse	"Check not found"
+//	@Failure		500			{object}	happydns.ErrorResponse	"Internal server error"
+//	@Router			/checks/{cname}/options/{optname} [get]
+//	@Router			/domains/{domain}/checks/{cname}/options/{optname} [get]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname}/options/{optname} [get]
+func (uc *CheckerController) GetCheckerOption(c *gin.Context) {
+	uc.GetCheckerOptionValue(c)
+}
+
+// SetCheckerOption sets or updates a specific option value for a check for the authenticated user.
+//
+//	@Summary		Set check option
+//	@Schemes
+//	@Description	Sets or updates the value of a specific configuration option for a check for the authenticated user.
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Param			cname			path		string	true	"Check name"
+//	@Param			optname		path		string	true	"Option name"
+//	@Param			domain		path		string	false	"Domain identifier"
+//	@Param			zoneid		path		string	false	"Zone identifier"
+//	@Param			subdomain	path		string	false	"Subdomain"
+//	@Param			serviceid	path		string	false	"Service identifier"
+//	@Param			body		body		object	true	"Option value (type varies by option)"
+//	@Success		200			{object}	bool	"Success status"
+//	@Failure		400			{object}	happydns.ErrorResponse	"Invalid request body"
+//	@Failure		404			{object}	happydns.ErrorResponse	"Check not found"
+//	@Failure		500			{object}	happydns.ErrorResponse	"Internal server error"
+//	@Router			/checks/{cname}/options/{optname} [put]
+//	@Router			/domains/{domain}/checks/{cname}/options/{optname} [put]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname}/options/{optname} [put]
+func (uc *CheckerController) SetCheckerOption(c *gin.Context) {
+	user := c.MustGet("LoggedUser").(*happydns.User)
+	cname := c.Param("cname")
+	optname := c.Param("optname")
+
+	uc.SetCheckerOptionWithScope(c, cname, optname, &user.Id, nil, nil)
+}

internal/api/controller/checkresult_controller.go

@@ -0,0 +1,592 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package controller
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"git.happydns.org/happyDomain/checks"
+	"git.happydns.org/happyDomain/internal/api/middleware"
+	"git.happydns.org/happyDomain/model"
+)
+
+// CheckResultController handles check result operations
+type CheckResultController struct {
+	scope          happydns.CheckScopeType
+	checkerUC      happydns.CheckerUsecase
+	checkResultUC  happydns.CheckResultUsecase
+	checkScheduler happydns.SchedulerUsecase
+}
+
+func NewCheckResultController(
+	scope happydns.CheckScopeType,
+	checkerUC happydns.CheckerUsecase,
+	checkResultUC happydns.CheckResultUsecase,
+	checkScheduler happydns.SchedulerUsecase,
+) *CheckResultController {
+	return &CheckResultController{
+		scope:          scope,
+		checkerUC:      checkerUC,
+		checkResultUC:  checkResultUC,
+		checkScheduler: checkScheduler,
+	}
+}
+
+// getTargetFromContext extracts the target ID from context based on scope
+func (tc *CheckResultController) getTargetFromContext(c *gin.Context) (happydns.Identifier, error) {
+	switch tc.scope {
+	case happydns.CheckScopeUser:
+		user := middleware.MyUser(c)
+		return user.Id, nil
+	case happydns.CheckScopeDomain:
+		domain := c.MustGet("domain").(*happydns.Domain)
+		return domain.Id, nil
+	case happydns.CheckScopeService:
+		// Services are stored by ID in context
+		serviceID := c.MustGet("serviceid").(happydns.Identifier)
+		return serviceID, nil
+	default:
+		return happydns.Identifier{}, fmt.Errorf("unsupported scope")
+	}
+}
+
+// getInsideFromContext extracts the inside scope and ID from context based on scope.
+// For service scope, the inside is the zone. For other scopes, both are nil.
+func (tc *CheckResultController) getInsideFromContext(c *gin.Context) (*happydns.CheckScopeType, *happydns.Identifier) {
+	if insideZone, ok := c.Get("zone"); tc.scope == happydns.CheckScopeService && ok {
+		scopetmp := happydns.CheckScopeZone
+		return &scopetmp, &insideZone.(*happydns.Zone).Id
+	}
+	return nil, nil
+}
+
+// ListAvailableChecks lists all available check plugins for the target scope
+//
+//	@Summary		List available checks
+//	@Description	Retrieves all available check plugins for the target scope with their last execution status if enabled
+//	@Tags			checks
+//	@Produce		json
+//	@Param			domain		path		string	true	"Domain identifier"
+//	@Param			zoneid		path		string	false	"Zone identifier"
+//	@Param			subdomain	path		string	false	"Subdomain"
+//	@Param			serviceid	path		string	false	"Service identifier"
+//	@Success		200		{array}		object	"List of available checks"
+//	@Failure		500		{object}	happydns.ErrorResponse
+//	@Router			/domains/{domain}/checks [get]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks [get]
+func (tc *CheckResultController) ListAvailableChecks(c *gin.Context) {
+	user := middleware.MyUser(c)
+	domain := c.MustGet("domain").(*happydns.Domain)
+	var service *happydns.Service
+
+	if svc, ok := c.Get("service"); ok {
+		service = svc.(*happydns.Service)
+	}
+
+	targetID, err := tc.getTargetFromContext(c)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	insideScope, insideID := tc.getInsideFromContext(c)
+	checks, err := tc.checkResultUC.ListCheckerStatuses(tc.scope, targetID, insideScope, insideID, user, domain, service)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	c.JSON(http.StatusOK, checks)
+}
+
+// ListLatestCheckResults retrieves the lacheck check results for a specific plugin
+//
+//	@Summary		Get lacheck check results
+//	@Description	Retrieves the 5 most recent check results for a specific plugin and target
+//	@Tags			checks
+//	@Produce		json
+//	@Param			domain		path		string	true	"Domain identifier"
+//	@Param			zoneid		path		string	false	"Zone identifier"
+//	@Param			subdomain	path		string	false	"Subdomain"
+//	@Param			serviceid	path		string	false	"Service identifier"
+//	@Param			cname		path		string	true	"Check plugin name"
+//	@Success		200		{array}		happydns.CheckResult
+//	@Failure		500		{object}	happydns.ErrorResponse
+//	@Router			/domains/{domain}/checks/{cname} [get]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname} [get]
+func (tc *CheckResultController) ListLatestCheckResults(c *gin.Context) {
+	user := middleware.MyUser(c)
+	checkName := c.Param("cname")
+	targetID, err := tc.getTargetFromContext(c)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	insideScope, insideID := tc.getInsideFromContext(c)
+	results, err := tc.checkResultUC.ListCheckResultsByTarget(checkName, tc.scope, targetID, insideScope, insideID, user.Id, 5)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	c.JSON(http.StatusOK, results)
+}
+
+// TriggerCheck triggers an on-demand check execution
+//
+//	@Summary		Trigger check execution
+//	@Description	Triggers an immediate check execution and returns the execution ID
+//	@Tags			checks
+//	@Accept			json
+//	@Produce		json
+//	@Param			domain		path		string	true	"Domain identifier"
+//	@Param			zoneid		path		string	false	"Zone identifier"
+//	@Param			subdomain	path		string	false	"Subdomain"
+//	@Param			serviceid	path		string	false	"Service identifier"
+//	@Param			cname		path		string	true	"Check plugin name"
+//	@Param			body	body		object	false	"Optional: Plugin options"
+//	@Success		202		{object}	object{execution_id=string}
+//	@Failure		400		{object}	happydns.ErrorResponse
+//	@Failure		500		{object}	happydns.ErrorResponse
+//	@Router			/domains/{domain}/checks/{cname} [post]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname} [post]
+func (tc *CheckResultController) TriggerCheck(c *gin.Context) {
+	user := middleware.MyUser(c)
+	checkName := c.Param("cname")
+	targetID, err := tc.getTargetFromContext(c)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	var insideId *happydns.Identifier
+	var insideScope *happydns.CheckScopeType
+	if insideZone, ok := c.Get("zone"); tc.scope == happydns.CheckScopeService && ok {
+		scopetmp := happydns.CheckScopeZone
+		insideScope = &scopetmp
+
+		insideId = &insideZone.(*happydns.Zone).Id
+	}
+
+	// Parse run options
+	var options happydns.SetCheckerOptionsRequest
+	if err = c.ShouldBindJSON(&options); err != nil {
+		middleware.ErrorResponse(c, http.StatusBadRequest, err)
+		return
+	}
+
+	// Trigger the test via scheduler (returns error if scheduler is disabled)
+	executionID, err := tc.checkScheduler.TriggerOnDemandCheck(checkName, tc.scope, targetID, insideScope, insideId, user.Id, options.Options)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	c.JSON(http.StatusAccepted, gin.H{"execution_id": executionID.String()})
+}
+
+// GetCheckExecutionStatus retrieves the status of a check execution
+//
+//	@Summary		Get check execution status
+//	@Description	Retrieves the current status of a check execution
+//	@Tags			checks
+//	@Produce		json
+//	@Param			domain			path		string	true	"Domain identifier"
+//	@Param			zoneid			path		string	false	"Zone identifier"
+//	@Param			subdomain		path		string	false	"Subdomain"
+//	@Param			serviceid		path		string	false	"Service identifier"
+//	@Param			cname			path		string	true	"Check plugin name"
+//	@Param			execution_id	path		string	true	"Execution ID"
+//	@Success		200				{object}	happydns.CheckExecution
+//	@Failure		404				{object}	happydns.ErrorResponse
+//	@Failure		500				{object}	happydns.ErrorResponse
+//	@Router			/domains/{domain}/checks/{cname}/executions/{execution_id} [get]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname}/executions/{execution_id} [get]
+func (tc *CheckResultController) GetCheckExecutionStatus(c *gin.Context) {
+	user := middleware.MyUser(c)
+	executionIDStr := c.Param("execution_id")
+	executionID, err := happydns.NewIdentifierFromString(executionIDStr)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusBadRequest, fmt.Errorf("invalid execution ID"))
+		return
+	}
+
+	execution, err := tc.checkResultUC.GetCheckExecution(executionID)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusNotFound, err)
+		return
+	}
+
+	if !execution.OwnerId.Equals(user.Id) {
+		middleware.ErrorResponse(c, http.StatusNotFound, happydns.ErrNotFound)
+		return
+	}
+
+	c.JSON(http.StatusOK, execution)
+}
+
+// ListCheckResults lists all results for a check plugin
+//
+//	@Summary		List check results
+//	@Description	Lists all check results for a specific check plugin and target
+//	@Tags			checks
+//	@Produce		json
+//	@Param			domain		path		string	true	"Domain identifier"
+//	@Param			zoneid		path		string	false	"Zone identifier"
+//	@Param			subdomain	path		string	false	"Subdomain"
+//	@Param			serviceid	path		string	false	"Service identifier"
+//	@Param			cname		path		string	true	"Check plugin name"
+//	@Param			limit	query		int		false	"Maximum number of results to return (default: 10)"
+//	@Success		200		{array}		happydns.CheckResult
+//	@Failure		500		{object}	happydns.ErrorResponse
+//	@Router			/domains/{domain}/checks/{cname}/results [get]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname}/results [get]
+func (tc *CheckResultController) ListCheckResults(c *gin.Context) {
+	user := middleware.MyUser(c)
+	checkName := c.Param("cname")
+	targetID, err := tc.getTargetFromContext(c)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	// Parse limit parameter
+	limit := 10
+	if limitStr := c.Query("limit"); limitStr != "" {
+		fmt.Sscanf(limitStr, "%d", &limit)
+	}
+
+	insideScope, insideID := tc.getInsideFromContext(c)
+	results, err := tc.checkResultUC.ListCheckResultsByTarget(checkName, tc.scope, targetID, insideScope, insideID, user.Id, limit)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	c.JSON(http.StatusOK, results)
+}
+
+// DropCheckResults deletes all results for a check plugin
+//
+//	@Summary		Delete all check results
+//	@Description	Deletes all check results for a specific check plugin and target
+//	@Tags			checks
+//	@Produce		json
+//	@Param			domain		path		string	true	"Domain identifier"
+//	@Param			zoneid		path		string	false	"Zone identifier"
+//	@Param			subdomain	path		string	false	"Subdomain"
+//	@Param			serviceid	path		string	false	"Service identifier"
+//	@Param			cname		path		string	true	"Check plugin name"
+//	@Success		204		"No Content"
+//	@Failure		500		{object}	happydns.ErrorResponse
+//	@Router			/domains/{domain}/checks/{cname}/results [delete]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname}/results [delete]
+func (tc *CheckResultController) DropCheckResults(c *gin.Context) {
+	user := middleware.MyUser(c)
+	checkName := c.Param("cname")
+	targetID, err := tc.getTargetFromContext(c)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	insideScope, insideID := tc.getInsideFromContext(c)
+	err = tc.checkResultUC.DeleteAllCheckResults(checkName, tc.scope, targetID, insideScope, insideID, user.Id)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	c.Status(http.StatusNoContent)
+}
+
+// GetCheckResult retrieves a specific check result
+//
+//	@Summary		Get check result
+//	@Description	Retrieves a specific check result by ID
+//	@Tags			checks
+//	@Produce		json
+//	@Param			domain		path		string	true	"Domain identifier"
+//	@Param			zoneid		path		string	false	"Zone identifier"
+//	@Param			subdomain	path		string	false	"Subdomain"
+//	@Param			serviceid	path		string	false	"Service identifier"
+//	@Param			cname		path		string	true	"Check plugin name"
+//	@Param			result_id	path		string	true	"Result ID"
+//	@Success		200			{object}	happydns.CheckResult
+//	@Failure		404			{object}	happydns.ErrorResponse
+//	@Failure		500			{object}	happydns.ErrorResponse
+//	@Router			/domains/{domain}/checks/{cname}/results/{result_id} [get]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname}/results/{result_id} [get]
+func (tc *CheckResultController) GetCheckResult(c *gin.Context) {
+	user := middleware.MyUser(c)
+	checkName := c.Param("cname")
+	resultIDStr := c.Param("result_id")
+	targetID, err := tc.getTargetFromContext(c)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	resultID, err := happydns.NewIdentifierFromString(resultIDStr)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusBadRequest, fmt.Errorf("invalid result ID"))
+		return
+	}
+
+	insideScope, insideID := tc.getInsideFromContext(c)
+	result, err := tc.checkResultUC.GetCheckResult(checkName, tc.scope, targetID, resultID, insideScope, insideID, user.Id)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusNotFound, err)
+		return
+	}
+
+	c.JSON(http.StatusOK, result)
+}
+
+// GetCheckResultHTMLReport returns the HTML report for a specific check result
+//
+//	@Summary		Get check result HTML report
+//	@Description	Returns the full HTML document generated from the check result's report data. Only available for checkers that implement HTML reporting.
+//	@Tags			checks
+//	@Produce		html
+//	@Param			domain		path		string	true	"Domain identifier"
+//	@Param			zoneid		path		string	false	"Zone identifier"
+//	@Param			subdomain	path		string	false	"Subdomain"
+//	@Param			serviceid	path		string	false	"Service identifier"
+//	@Param			cname		path		string	true	"Check plugin name"
+//	@Param			result_id	path		string	true	"Result ID"
+//	@Success		200			{string}	string	"HTML document"
+//	@Failure		404			{object}	happydns.ErrorResponse
+//	@Failure		500			{object}	happydns.ErrorResponse
+//	@Router			/domains/{domain}/checks/{cname}/results/{result_id}/report [get]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname}/results/{result_id}/report [get]
+func (tc *CheckResultController) GetCheckResultHTMLReport(c *gin.Context) {
+	user := middleware.MyUser(c)
+	checkName := c.Param("cname")
+	resultIDStr := c.Param("result_id")
+	targetID, err := tc.getTargetFromContext(c)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	resultID, err := happydns.NewIdentifierFromString(resultIDStr)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusBadRequest, fmt.Errorf("invalid result ID"))
+		return
+	}
+
+	insideScope, insideID := tc.getInsideFromContext(c)
+	result, err := tc.checkResultUC.GetCheckResult(checkName, tc.scope, targetID, resultID, insideScope, insideID, user.Id)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusNotFound, err)
+		return
+	}
+
+	checker, err := tc.checkerUC.GetChecker(checkName)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusNotFound, err)
+		return
+	}
+
+	raw, err := json.Marshal(result.Report)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	htmlContent, supported, err := checks.GetHTMLReport(checker, json.RawMessage(raw))
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+	if !supported {
+		middleware.ErrorResponse(c, http.StatusNotFound, fmt.Errorf("checker %q does not support HTML reports", checkName))
+		return
+	}
+
+	c.Data(http.StatusOK, "text/html; charset=utf-8", []byte(htmlContent))
+}
+
+// GetCheckResultMetrics returns time-series metrics extracted from check results
+//
+//	@Summary		Get check result metrics
+//	@Description	Returns time-series metrics suitable for charting, extracted from recent check results. Only available for checkers that implement metrics reporting.
+//	@Tags			checks
+//	@Produce		json
+//	@Param			domain		path		string	true	"Domain identifier"
+//	@Param			zoneid		path		string	false	"Zone identifier"
+//	@Param			subdomain	path		string	false	"Subdomain"
+//	@Param			serviceid	path		string	false	"Service identifier"
+//	@Param			cname		path		string	true	"Check plugin name"
+//	@Param			limit		query		int		false	"Maximum number of results to extract metrics from (default: 100)"
+//	@Success		200			{object}	happydns.MetricsReport
+//	@Failure		404			{object}	happydns.ErrorResponse
+//	@Failure		500			{object}	happydns.ErrorResponse
+//	@Router			/domains/{domain}/checks/{cname}/metrics [get]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname}/metrics [get]
+func (tc *CheckResultController) GetCheckResultMetrics(c *gin.Context) {
+	user := middleware.MyUser(c)
+	checkName := c.Param("cname")
+	targetID, err := tc.getTargetFromContext(c)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	limit := 100
+	if limitStr := c.Query("limit"); limitStr != "" {
+		fmt.Sscanf(limitStr, "%d", &limit)
+	}
+
+	checker, err := tc.checkerUC.GetChecker(checkName)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusNotFound, err)
+		return
+	}
+
+	insideScope, insideID := tc.getInsideFromContext(c)
+	results, err := tc.checkResultUC.ListCheckResultsByTarget(checkName, tc.scope, targetID, insideScope, insideID, user.Id, limit)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	report, supported, err := checks.GetMetrics(checker, results)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+	if !supported {
+		middleware.ErrorResponse(c, http.StatusNotFound, fmt.Errorf("checker %q does not support metrics", checkName))
+		return
+	}
+
+	c.JSON(http.StatusOK, report)
+}
+
+// GetSingleCheckResultMetrics returns metrics extracted from a single check result
+//
+//	@Summary		Get single check result metrics
+//	@Description	Returns metrics extracted from a single check result. Only available for checkers that implement metrics reporting.
+//	@Tags			checks
+//	@Produce		json
+//	@Param			domain		path		string	true	"Domain identifier"
+//	@Param			zoneid		path		string	false	"Zone identifier"
+//	@Param			subdomain	path		string	false	"Subdomain"
+//	@Param			serviceid	path		string	false	"Service identifier"
+//	@Param			cname		path		string	true	"Check plugin name"
+//	@Param			result_id	path		string	true	"Result ID"
+//	@Success		200			{object}	happydns.MetricsReport
+//	@Failure		404			{object}	happydns.ErrorResponse
+//	@Failure		500			{object}	happydns.ErrorResponse
+//	@Router			/domains/{domain}/checks/{cname}/results/{result_id}/metrics [get]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname}/results/{result_id}/metrics [get]
+func (tc *CheckResultController) GetSingleCheckResultMetrics(c *gin.Context) {
+	user := middleware.MyUser(c)
+	checkName := c.Param("cname")
+	resultIDStr := c.Param("result_id")
+	targetID, err := tc.getTargetFromContext(c)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	resultID, err := happydns.NewIdentifierFromString(resultIDStr)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusBadRequest, fmt.Errorf("invalid result ID"))
+		return
+	}
+
+	insideScope, insideID := tc.getInsideFromContext(c)
+	result, err := tc.checkResultUC.GetCheckResult(checkName, tc.scope, targetID, resultID, insideScope, insideID, user.Id)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusNotFound, err)
+		return
+	}
+
+	checker, err := tc.checkerUC.GetChecker(checkName)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusNotFound, err)
+		return
+	}
+
+	report, supported, err := checks.GetMetrics(checker, []*happydns.CheckResult{result})
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+	if !supported {
+		middleware.ErrorResponse(c, http.StatusNotFound, fmt.Errorf("checker %q does not support metrics", checkName))
+		return
+	}
+
+	c.JSON(http.StatusOK, report)
+}
+
+// DropCheckResult deletes a specific check result
+//
+//	@Summary		Delete check result
+//	@Description	Deletes a specific check result by ID
+//	@Tags			checks
+//	@Produce		json
+//	@Param			domain		path		string	true	"Domain identifier"
+//	@Param			zoneid		path		string	false	"Zone identifier"
+//	@Param			subdomain	path		string	false	"Subdomain"
+//	@Param			serviceid	path		string	false	"Service identifier"
+//	@Param			cname		path		string	true	"Check plugin name"
+//	@Param			result_id	path		string	true	"Result ID"
+//	@Success		204			"No Content"
+//	@Failure		404			{object}	happydns.ErrorResponse
+//	@Failure		500			{object}	happydns.ErrorResponse
+//	@Router			/domains/{domain}/checks/{cname}/results/{result_id} [delete]
+//	@Router			/domains/{domain}/zone/{zoneid}/{subdomain}/services/{serviceid}/checks/{cname}/results/{result_id} [delete]
+func (tc *CheckResultController) DropCheckResult(c *gin.Context) {
+	user := middleware.MyUser(c)
+	checkName := c.Param("cname")
+	resultIDStr := c.Param("result_id")
+	targetID, err := tc.getTargetFromContext(c)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	resultID, err := happydns.NewIdentifierFromString(resultIDStr)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusBadRequest, fmt.Errorf("invalid result ID"))
+		return
+	}
+
+	insideScope, insideID := tc.getInsideFromContext(c)
+	err = tc.checkResultUC.DeleteCheckResult(checkName, tc.scope, targetID, resultID, insideScope, insideID, user.Id)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusNotFound, err)
+		return
+	}
+
+	c.Status(http.StatusNoContent)
+}

internal/api/controller/domain.go

@@ -37,13 +37,15 @@ type DomainController struct {
 	domainService      happydns.DomainUsecase
 	remoteZoneImporter happydns.RemoteZoneImporterUsecase
 	zoneImporter       happydns.ZoneImporterUsecase
+	checkResultUC      happydns.CheckResultUsecase
 }
 
-func NewDomainController(domainService happydns.DomainUsecase, remoteZoneImporter happydns.RemoteZoneImporterUsecase, zoneImporter happydns.ZoneImporterUsecase) *DomainController {
+func NewDomainController(domainService happydns.DomainUsecase, remoteZoneImporter happydns.RemoteZoneImporterUsecase, zoneImporter happydns.ZoneImporterUsecase, checkResultUC happydns.CheckResultUsecase) *DomainController {
 	return &DomainController{
 		domainService:      domainService,
 		remoteZoneImporter: remoteZoneImporter,
 		zoneImporter:       zoneImporter,
+		checkResultUC:      checkResultUC,
 	}
 }
 
@@ -56,7 +58,7 @@ func NewDomainController(domainService happydns.DomainUsecase, remoteZoneImporte
 //	@Accept			json
 //	@Produce		json
 //	@Security		securitydefinitions.basic
-//	@Success		200	{array}		happydns.Domain
+//	@Success		200	{array}		happydns.DomainWithCheckStatus
 //	@Failure		401	{object}	happydns.ErrorResponse	"Authentication failure"
 //	@Failure		404	{object}	happydns.ErrorResponse	"Unable to retrieve user's domains"
 //	@Router			/domains [get]
@@ -73,7 +75,25 @@ func (dc *DomainController) GetDomains(c *gin.Context) {
 		return
 	}
 
-	c.JSON(http.StatusOK, domains)
+	var statusByDomain map[string]*happydns.CheckResultStatus
+	if dc.checkResultUC != nil {
+		var err error
+		statusByDomain, err = dc.checkResultUC.GetWorstCheckStatusByUser(happydns.CheckScopeDomain, user.Id)
+		if err != nil {
+			log.Printf("GetWorstCheckStatusByUser: %s", err.Error())
+		}
+	}
+
+	result := make([]*happydns.DomainWithCheckStatus, 0, len(domains))
+	for _, d := range domains {
+		entry := &happydns.DomainWithCheckStatus{Domain: d}
+		if statusByDomain != nil {
+			entry.LastCheckStatus = statusByDomain[d.Id.String()]
+		}
+		result = append(result, entry)
+	}
+
+	c.JSON(http.StatusOK, result)
 }
 
 // AddDomain appends a new domain to those managed.

internal/api/controller/domain_info.go

@@ -0,0 +1,74 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2025 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package controller
+
+import (
+	"errors"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"git.happydns.org/happyDomain/model"
+)
+
+type DomainInfoController struct {
+	diuService happydns.DomainInfoUsecase
+}
+
+func NewDomainInfoController(diuService happydns.DomainInfoUsecase) *DomainInfoController {
+	return &DomainInfoController{
+		diuService: diuService,
+	}
+}
+
+// GetDomainInfo retrieves domain's administrative information.
+//
+//	@Summary	Get domain administrative information
+//	@Schemes
+//	@Description	Retrieve domain's administrative information.
+//	@Tags			domains
+//	@Accept			json
+//	@Produce		json
+//	@Security		securitydefinitions.basic
+//	@Param			domain	path		string			true	"Domain name"
+//	@Success		200		{object}	happydns.DomainInfo
+//	@Failure		400		{object}	happydns.ErrorResponse	"Invalid input"
+//	@Failure		500		{object}	happydns.ErrorResponse
+//	@Router			/domaininfo/{domain} [post]
+func (dc *DomainInfoController) GetDomainInfo(c *gin.Context) {
+	domain := c.Param("domain")
+	if dn, ok := c.Get("domain"); ok {
+		domain = dn.(*happydns.Domain).DomainName
+	}
+
+	info, err := dc.diuService.GetDomainInfo(c.Request.Context(), happydns.Origin(domain))
+	if err != nil {
+		if errors.Is(err, happydns.DomainDoesNotExist) {
+			c.AbortWithStatusJSON(http.StatusNotFound, happydns.ErrorResponse{Message: err.Error()})
+		} else {
+			c.AbortWithStatusJSON(http.StatusInternalServerError, happydns.ErrorResponse{Message: err.Error()})
+		}
+		return
+	}
+
+	c.JSON(http.StatusOK, info)
+}

internal/api/controller/service.go

@@ -34,16 +34,18 @@ import (
 )
 
 type ServiceController struct {
-	suService happydns.ServiceUsecase
+	checkResultUC happydns.CheckResultUsecase
-	duService happydns.ZoneServiceUsecase
+	suService     happydns.ServiceUsecase
-	zuService happydns.ZoneUsecase
+	duService     happydns.ZoneServiceUsecase
+	zuService     happydns.ZoneUsecase
 }
 
-func NewServiceController(duService happydns.ZoneServiceUsecase, suService happydns.ServiceUsecase, zuService happydns.ZoneUsecase) *ServiceController {
+func NewServiceController(duService happydns.ZoneServiceUsecase, suService happydns.ServiceUsecase, zuService happydns.ZoneUsecase, checkResultUC happydns.CheckResultUsecase) *ServiceController {
 	return &ServiceController{
-		duService: duService,
+		checkResultUC: checkResultUC,
-		suService: suService,
+		duService:     duService,
-		zuService: zuService,
+		suService:     suService,
+		zuService:     zuService,
 	}
 }
 
@@ -106,18 +108,28 @@ func (sc *ServiceController) AddZoneService(c *gin.Context) {
 //	@Param			zoneId		path		string	true	"Zone identifier"
 //	@Param			subdomain	path		string	true	"Part of the subdomain considered for the service (@ for the root of the zone ; subdomain is relative to the root, do not include it)"
 //	@Param			serviceId	path		string	true	"Service identifier"
-//	@Success		200			{object}	happydns.Service
+//	@Success		200			{object}	happydns.ServiceWithCheckStatus
 //	@Failure		401			{object}	happydns.ErrorResponse	"Authentication failure"
 //	@Failure		404			{object}	happydns.ErrorResponse	"Domain or Zone not found"
 //	@Router			/domains/{domainId}/zone/{zoneId}/{subdomain}/services/{serviceId} [get]
 func (sc *ServiceController) GetZoneService(c *gin.Context) {
-	zone := c.MustGet("zone").(*happydns.Zone)
+	user := middleware.MyUser(c)
-	serviceid := c.MustGet("serviceid").(happydns.Identifier)
+	svc := c.MustGet("service").(*happydns.Service)
-	subdomain := c.MustGet("subdomain").(happydns.Subdomain)
 
-	_, svc := zone.FindSubdomainService(subdomain, serviceid)
+	result := &happydns.ServiceWithCheckStatus{Service: svc}
 
-	c.JSON(http.StatusOK, svc)
+	if sc.checkResultUC != nil && user != nil {
+		insideZone := c.MustGet("zone").(*happydns.Zone)
+		insideScope := happydns.CheckScopeZone
+		status, err := sc.checkResultUC.GetWorstCheckStatus(happydns.CheckScopeService, svc.Id, &insideScope, &insideZone.Id, user.Id)
+		if err != nil {
+			log.Printf("GetWorstCheckStatus: %s", err.Error())
+		} else {
+			result.LastCheckStatus = status
+		}
+	}
+
+	c.JSON(http.StatusOK, result)
 }
 
 // UpdateZoneService adds or updates a service inside the given Zone.

internal/api/controller/testschedule_controller.go

@@ -0,0 +1,231 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package controller
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+
+	"git.happydns.org/happyDomain/internal/api/middleware"
+	"git.happydns.org/happyDomain/model"
+)
+
+// CheckerScheduleController handles test schedule operations
+type CheckerScheduleController struct {
+	testScheduleUC happydns.CheckerScheduleUsecase
+}
+
+func NewCheckerScheduleController(testScheduleUC happydns.CheckerScheduleUsecase) *CheckerScheduleController {
+	return &CheckerScheduleController{
+		testScheduleUC: testScheduleUC,
+	}
+}
+
+// ListCheckerSchedules retrieves schedules for the authenticated user
+//
+//	@Summary		List test schedules
+//	@Description	Retrieves test schedules for the authenticated user with optional pagination
+//	@Tags			test-schedules
+//	@Produce		json
+//	@Param			limit	query		int	false	"Maximum number of schedules to return (0 = all)"
+//	@Param			offset	query		int	false	"Number of schedules to skip (default: 0)"
+//	@Success		200	{array}		happydns.CheckerSchedule
+//	@Failure		500	{object}	happydns.ErrorResponse
+//	@Router			/plugins/tests/schedules [get]
+func (tc *CheckerScheduleController) ListCheckerSchedules(c *gin.Context) {
+	user := middleware.MyUser(c)
+
+	schedules, err := tc.testScheduleUC.ListUserSchedules(user.Id)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	// Apply pagination
+	limit := 0
+	offset := 0
+	fmt.Sscanf(c.Query("limit"), "%d", &limit)
+	fmt.Sscanf(c.Query("offset"), "%d", &offset)
+
+	if offset > len(schedules) {
+		offset = len(schedules)
+	}
+	schedules = schedules[offset:]
+	if limit > 0 && len(schedules) > limit {
+		schedules = schedules[:limit]
+	}
+
+	c.JSON(http.StatusOK, schedules)
+}
+
+// CreateCheckerSchedule creates a new test schedule
+//
+//	@Summary		Create test schedule
+//	@Description	Creates a new test schedule for the authenticated user
+//	@Tags			test-schedules
+//	@Accept			json
+//	@Produce		json
+//	@Param			body	body		happydns.CheckerSchedule	true	"Check schedule to create"
+//	@Success		201		{object}	happydns.CheckerSchedule
+//	@Failure		400		{object}	happydns.ErrorResponse
+//	@Failure		500		{object}	happydns.ErrorResponse
+//	@Router			/plugins/tests/schedules [post]
+func (tc *CheckerScheduleController) CreateCheckerSchedule(c *gin.Context) {
+	user := middleware.MyUser(c)
+
+	var schedule happydns.CheckerSchedule
+	if err := c.ShouldBindJSON(&schedule); err != nil {
+		middleware.ErrorResponse(c, http.StatusBadRequest, err)
+		return
+	}
+
+	// Set user ID
+	schedule.OwnerId = user.Id
+
+	if err := tc.testScheduleUC.CreateSchedule(&schedule); err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	c.JSON(http.StatusCreated, schedule)
+}
+
+// GetCheckerSchedule retrieves a specific schedule
+//
+//	@Summary		Get test schedule
+//	@Description	Retrieves a specific test schedule by ID
+//	@Tags			test-schedules
+//	@Produce		json
+//	@Param			schedule_id	path		string	true	"Schedule ID"
+//	@Success		200			{object}	happydns.CheckerSchedule
+//	@Failure		404			{object}	happydns.ErrorResponse
+//	@Failure		500			{object}	happydns.ErrorResponse
+//	@Router			/plugins/tests/schedules/{schedule_id} [get]
+func (tc *CheckerScheduleController) GetCheckerSchedule(c *gin.Context) {
+	user := middleware.MyUser(c)
+	scheduleIdStr := c.Param("schedule_id")
+
+	scheduleId, err := happydns.NewIdentifierFromString(scheduleIdStr)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusBadRequest, fmt.Errorf("invalid schedule ID"))
+		return
+	}
+
+	// Verify ownership
+	if err := tc.testScheduleUC.ValidateScheduleOwnership(scheduleId, user.Id); err != nil {
+		middleware.ErrorResponse(c, http.StatusForbidden, err)
+		return
+	}
+
+	schedule, err := tc.testScheduleUC.GetSchedule(scheduleId)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusNotFound, err)
+		return
+	}
+
+	c.JSON(http.StatusOK, schedule)
+}
+
+// UpdateCheckerSchedule updates an existing schedule
+//
+//	@Summary		Update test schedule
+//	@Description	Updates an existing test schedule
+//	@Tags			test-schedules
+//	@Accept			json
+//	@Produce		json
+//	@Param			schedule_id	path		string					true	"Schedule ID"
+//	@Param			body		body		happydns.CheckerSchedule	true	"Updated schedule"
+//	@Success		200			{object}	happydns.CheckerSchedule
+//	@Failure		400			{object}	happydns.ErrorResponse
+//	@Failure		404			{object}	happydns.ErrorResponse
+//	@Failure		500			{object}	happydns.ErrorResponse
+//	@Router			/plugins/tests/schedules/{schedule_id} [put]
+func (tc *CheckerScheduleController) UpdateCheckerSchedule(c *gin.Context) {
+	user := middleware.MyUser(c)
+	scheduleIdStr := c.Param("schedule_id")
+
+	scheduleId, err := happydns.NewIdentifierFromString(scheduleIdStr)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusBadRequest, fmt.Errorf("invalid schedule ID"))
+		return
+	}
+
+	// Verify ownership
+	if err := tc.testScheduleUC.ValidateScheduleOwnership(scheduleId, user.Id); err != nil {
+		middleware.ErrorResponse(c, http.StatusForbidden, err)
+		return
+	}
+
+	var schedule happydns.CheckerSchedule
+	if err := c.ShouldBindJSON(&schedule); err != nil {
+		middleware.ErrorResponse(c, http.StatusBadRequest, err)
+		return
+	}
+
+	// Ensure ID matches
+	schedule.Id = scheduleId
+	schedule.OwnerId = user.Id
+
+	if err := tc.testScheduleUC.UpdateSchedule(&schedule); err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	c.JSON(http.StatusOK, schedule)
+}
+
+// DeleteCheckerSchedule deletes a schedule
+//
+//	@Summary		Delete test schedule
+//	@Description	Deletes a test schedule
+//	@Tags			test-schedules
+//	@Produce		json
+//	@Param			schedule_id	path	string	true	"Schedule ID"
+//	@Success		204			"No Content"
+//	@Failure		404			{object}	happydns.ErrorResponse
+//	@Failure		500			{object}	happydns.ErrorResponse
+//	@Router			/plugins/tests/schedules/{schedule_id} [delete]
+func (tc *CheckerScheduleController) DeleteCheckerSchedule(c *gin.Context) {
+	user := middleware.MyUser(c)
+	scheduleIdStr := c.Param("schedule_id")
+
+	scheduleId, err := happydns.NewIdentifierFromString(scheduleIdStr)
+	if err != nil {
+		middleware.ErrorResponse(c, http.StatusBadRequest, fmt.Errorf("invalid schedule ID"))
+		return
+	}
+
+	// Verify ownership
+	if err := tc.testScheduleUC.ValidateScheduleOwnership(scheduleId, user.Id); err != nil {
+		middleware.ErrorResponse(c, http.StatusForbidden, err)
+		return
+	}
+
+	if err := tc.testScheduleUC.DeleteSchedule(scheduleId); err != nil {
+		middleware.ErrorResponse(c, http.StatusInternalServerError, err)
+		return
+	}
+
+	c.Status(http.StatusNoContent)
+}

internal/api/controller/zone.go

@@ -35,13 +35,15 @@ import (
 )
 
 type ZoneController struct {
+	checkResultUC         happydns.CheckResultUsecase
 	domainService         happydns.DomainUsecase
 	zoneCorrectionService happydns.ZoneCorrectionApplierUsecase
 	zoneService           happydns.ZoneUsecase
 }
 
-func NewZoneController(zoneService happydns.ZoneUsecase, domainService happydns.DomainUsecase, zoneCorrectionService happydns.ZoneCorrectionApplierUsecase) *ZoneController {
+func NewZoneController(zoneService happydns.ZoneUsecase, domainService happydns.DomainUsecase, zoneCorrectionService happydns.ZoneCorrectionApplierUsecase, checkResultUC happydns.CheckResultUsecase) *ZoneController {
 	return &ZoneController{
+		checkResultUC:         checkResultUC,
 		domainService:         domainService,
 		zoneCorrectionService: zoneCorrectionService,
 		zoneService:           zoneService,
@@ -59,14 +61,37 @@ func NewZoneController(zoneService happydns.ZoneUsecase, domainService happydns.
 //	@Security		securitydefinitions.basic
 //	@Param			domainId	path		string	true	"Domain identifier"
 //	@Param			zoneId		path		string	true	"Zone identifier"
-//	@Success		200			{object}	happydns.Zone
+//	@Success		200			{object}	happydns.ZoneWithServicesCheckStatus
 //	@Failure		401			{object}	happydns.ErrorResponse	"Authentication failure"
 //	@Failure		404			{object}	happydns.ErrorResponse	"Domain or Zone not found"
 //	@Router			/domains/{domainId}/zone/{zoneId} [get]
 func (zc *ZoneController) GetZone(c *gin.Context) {
+	user := middleware.MyUser(c)
 	zone := c.MustGet("zone").(*happydns.Zone)
 
-	c.JSON(http.StatusOK, zone)
+	result := &happydns.ZoneWithServicesCheckStatus{Zone: zone}
+
+	if zc.checkResultUC != nil && user != nil {
+		statusByService, err := zc.checkResultUC.GetWorstCheckStatusByUser(happydns.CheckScopeService, user.Id)
+		if err != nil {
+			log.Printf("GetWorstCheckStatusByUser: %s", err.Error())
+		} else if statusByService != nil {
+			result.ServicesCheckStatus = make(map[string]*happydns.CheckResultStatus)
+			for subdomain := range zone.Services {
+				for _, svc := range zone.Services[subdomain] {
+					key := svc.Id.String()
+					if status, ok := statusByService[key]; ok {
+						result.ServicesCheckStatus[key] = status
+					}
+				}
+			}
+			if len(result.ServicesCheckStatus) == 0 {
+				result.ServicesCheckStatus = nil
+			}
+		}
+	}
+
+	c.JSON(http.StatusOK, result)
 }
 
 // GetZoneSubdomain returns the services associated with a given subdomain.

internal/api/middleware/service.go

@@ -43,3 +43,21 @@ func ServiceIdHandler(suService happydns.ServiceUsecase) gin.HandlerFunc {
 		c.Next()
 	}
 }
+
+func ServiceHandler(suService happydns.ServiceUsecase) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		zone := c.MustGet("zone").(*happydns.Zone)
+		serviceid := c.MustGet("serviceid").(happydns.Identifier)
+		subdomain := c.MustGet("subdomain").(happydns.Subdomain)
+
+		_, svc := zone.FindSubdomainService(subdomain, serviceid)
+		if svc == nil {
+			c.AbortWithStatusJSON(http.StatusNotFound, gin.H{"errmsg": fmt.Sprintf("Service not found: %s", serviceid)})
+			return
+		}
+
+		c.Set("service", svc)
+
+		c.Next()
+	}
+}

internal/api/route/checker.go

@@ -0,0 +1,93 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package route
+
+import (
+	"github.com/gin-gonic/gin"
+
+	"git.happydns.org/happyDomain/internal/api/controller"
+	happydns "git.happydns.org/happyDomain/model"
+)
+
+func DeclareCheckersRoutes(router *gin.RouterGroup, checkerUC happydns.CheckerUsecase) *controller.CheckerController {
+	tpc := controller.NewCheckerController(checkerUC)
+
+	router.GET("/checks", tpc.ListCheckers)
+
+	apiCheckRoutes := router.Group("/checks/:cname")
+	apiCheckRoutes.Use(tpc.CheckerHandler)
+
+	apiCheckRoutes.GET("", tpc.GetCheckerStatus)
+
+	DeclareCheckerOptionsRoutes(apiCheckRoutes, tpc)
+
+	return tpc
+}
+
+func DeclareScopedCheckersRoutes(
+	scopedRouter *gin.RouterGroup,
+	checkerUC happydns.CheckerUsecase,
+	checkResultUC happydns.CheckResultUsecase,
+	checkScheduler happydns.SchedulerUsecase,
+	scope happydns.CheckScopeType,
+	tpc *controller.CheckerController,
+) {
+	tc := controller.NewCheckResultController(
+		scope,
+		checkerUC,
+		checkResultUC,
+		checkScheduler,
+	)
+
+	// List all available tests with their status
+	scopedRouter.GET("/checks", tc.ListAvailableChecks)
+
+	apiChecksRoutes := scopedRouter.Group("/checks/:cname")
+	{
+		DeclareCheckerOptionsRoutes(apiChecksRoutes, tpc)
+
+		// Get latest results for a test
+		apiChecksRoutes.GET("", tc.ListLatestCheckResults)
+
+		// Trigger an on-demand test
+		apiChecksRoutes.POST("", tc.TriggerCheck)
+
+		// Check execution routes
+		apiCheckExecutionsRoutes := apiChecksRoutes.Group("/executions/:execution_id")
+		{
+			apiCheckExecutionsRoutes.GET("", tc.GetCheckExecutionStatus)
+		}
+
+		DeclareScopedCheckResultRoutes(apiChecksRoutes, tc)
+	}
+}
+
+func DeclareCheckerOptionsRoutes(apiCheckRoutes *gin.RouterGroup, tpc *controller.CheckerController) {
+	apiCheckRoutes.GET("/options", tpc.GetCheckerOptions)
+	apiCheckRoutes.POST("/options", tpc.AddCheckerOptions)
+	apiCheckRoutes.PUT("/options", tpc.ChangeCheckerOptions)
+
+	apiCheckOptionsRoutes := apiCheckRoutes.Group("/options/:optname")
+	apiCheckOptionsRoutes.Use(tpc.CheckerOptionHandler)
+	apiCheckOptionsRoutes.GET("", tpc.GetCheckerOption)
+	apiCheckOptionsRoutes.PUT("", tpc.SetCheckerOption)
+}

internal/api/route/checkresults.go

@@ -0,0 +1,46 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package route
+
+import (
+	"github.com/gin-gonic/gin"
+
+	"git.happydns.org/happyDomain/internal/api/controller"
+)
+
+// DeclareScopedCheckResultRoutes declares test result routes for a specific scope (domain, zone, or service)
+func DeclareScopedCheckResultRoutes(apiChecksRoutes *gin.RouterGroup, tc *controller.CheckResultController) {
+	// Check metrics route
+	apiChecksRoutes.GET("/metrics", tc.GetCheckResultMetrics)
+
+	// Check results routes
+	apiChecksRoutes.GET("/results", tc.ListCheckResults)
+	apiChecksRoutes.DELETE("/results", tc.DropCheckResults)
+
+	apiCheckResultsRoutes := apiChecksRoutes.Group("/results/:result_id")
+	{
+		apiCheckResultsRoutes.GET("", tc.GetCheckResult)
+		apiCheckResultsRoutes.DELETE("", tc.DropCheckResult)
+		apiCheckResultsRoutes.GET("/report", tc.GetCheckResultHTMLReport)
+		apiCheckResultsRoutes.GET("/metrics", tc.GetSingleCheckResultMetrics)
+	}
+}

internal/api/route/checkschedule.go

@@ -0,0 +1,47 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package route
+
+import (
+	"github.com/gin-gonic/gin"
+
+	"git.happydns.org/happyDomain/internal/api/controller"
+	"git.happydns.org/happyDomain/model"
+)
+
+// DeclareTestScheduleRoutes declares test schedule management routes
+func DeclareTestScheduleRoutes(router *gin.RouterGroup, checkerScheduleUC happydns.CheckerScheduleUsecase) {
+	sc := controller.NewCheckerScheduleController(checkerScheduleUC)
+
+	schedulesRoutes := router.Group("/plugins/tests/schedules")
+	{
+		schedulesRoutes.GET("", sc.ListCheckerSchedules)
+		schedulesRoutes.POST("", sc.CreateCheckerSchedule)
+
+		scheduleRoutes := schedulesRoutes.Group("/:schedule_id")
+		{
+			scheduleRoutes.GET("", sc.GetCheckerSchedule)
+			scheduleRoutes.PUT("", sc.UpdateCheckerSchedule)
+			scheduleRoutes.DELETE("", sc.DeleteCheckerSchedule)
+		}
+	}
+}

internal/api/route/domain.go

@@ -39,11 +39,17 @@ func DeclareDomainRoutes(
 	zoneCorrApplier happydns.ZoneCorrectionApplierUsecase,
 	zoneServiceUC happydns.ZoneServiceUsecase,
 	serviceUC happydns.ServiceUsecase,
+	checkerUC happydns.CheckerUsecase,
+	checkResultUC happydns.CheckResultUsecase,
+	checkScheduler happydns.SchedulerUsecase,
+	domainInfoUC happydns.DomainInfoUsecase,
+	tpc *controller.CheckerController,
 ) {
 	dc := controller.NewDomainController(
 		domainUC,
 		remoteZoneImporter,
 		zoneImporter,
+		checkResultUC,
 	)
 
 	router.GET("/domains", dc.GetDomains)
@@ -56,8 +62,20 @@ func DeclareDomainRoutes(
 	apiDomainsRoutes.PUT("", dc.UpdateDomain)
 	apiDomainsRoutes.DELETE("", dc.DelDomain)
 
+	DeclareDomainInfoRoutes(apiDomainsRoutes.Group("/info"), domainInfoUC)
 	DeclareDomainLogRoutes(apiDomainsRoutes, domainLogUC)
 
+	// Declare test result routes for domain scope
+
+	DeclareScopedCheckersRoutes(
+		apiDomainsRoutes,
+		checkerUC,
+		checkResultUC,
+		checkScheduler,
+		happydns.CheckScopeDomain,
+		tpc,
+	)
+
 	apiDomainsRoutes.POST("/zone", dc.ImportZone)
 	apiDomainsRoutes.POST("/retrieve_zone", dc.RetrieveZone)
 
@@ -68,5 +86,9 @@ func DeclareDomainRoutes(
 		zoneCorrApplier,
 		zoneServiceUC,
 		serviceUC,
+		checkerUC,
+		checkResultUC,
+		checkScheduler,
+		tpc,
 	)
 }

internal/api/route/domain_info.go

@@ -0,0 +1,37 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2025 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package route
+
+import (
+	"github.com/gin-gonic/gin"
+
+	"git.happydns.org/happyDomain/internal/api/controller"
+	"git.happydns.org/happyDomain/model"
+)
+
+func DeclareDomainInfoRoutes(router *gin.RouterGroup, domainInfoUC happydns.DomainInfoUsecase) {
+	dc := controller.NewDomainInfoController(
+		domainInfoUC,
+	)
+
+	router.POST("", dc.GetDomainInfo)
+}

internal/api/route/route.go

@@ -34,7 +34,12 @@ type Dependencies struct {
 	Authentication        happydns.AuthenticationUsecase
 	AuthUser              happydns.AuthUserUsecase
 	CaptchaVerifier       happydns.CaptchaVerifier
+	Checker               happydns.CheckerUsecase
+	CheckResult           happydns.CheckResultUsecase
+	CheckerSchedule       happydns.CheckerScheduleUsecase
+	CheckScheduler        happydns.SchedulerUsecase
 	Domain                happydns.DomainUsecase
+	DomainInfo            happydns.DomainInfoUsecase
 	DomainLog             happydns.DomainLogUsecase
 	FailureTracker        happydns.FailureTracker
 	Provider              happydns.ProviderUsecase
@@ -88,6 +93,7 @@ func DeclareRoutes(cfg *happydns.Options, router *gin.RouterGroup, dep Dependenc
 		dep.FailureTracker,
 	)
 	auc := DeclareAuthUserRoutes(apiRoutes, dep.AuthUser, lc)
+	DeclareDomainInfoRoutes(apiRoutes.Group("/domaininfo/:domain"), dep.DomainInfo)
 	DeclareProviderSpecsRoutes(apiRoutes, dep.ProviderSpecs)
 	DeclareRegistrationRoutes(apiRoutes, dep.AuthUser, dep.CaptchaVerifier)
 	DeclareResolverRoutes(apiRoutes, dep.Resolver)
@@ -106,6 +112,7 @@ func DeclareRoutes(cfg *happydns.Options, router *gin.RouterGroup, dep Dependenc
 	apiAuthRoutes.Use(middleware.AuthRequired())
 
 	DeclareAuthenticationCheckRoutes(apiAuthRoutes, lc)
+	tpc := DeclareCheckersRoutes(apiAuthRoutes, dep.Checker)
 	DeclareDomainRoutes(
 		apiAuthRoutes,
 		dep.Domain,
@@ -116,10 +123,16 @@ func DeclareRoutes(cfg *happydns.Options, router *gin.RouterGroup, dep Dependenc
 		dep.ZoneCorrectionApplier,
 		dep.ZoneService,
 		dep.Service,
+		dep.Checker,
+		dep.CheckResult,
+		dep.CheckScheduler,
+		dep.DomainInfo,
+		tpc,
 	)
 	DeclareProviderRoutes(apiAuthRoutes, dep.Provider)
 	DeclareProviderSettingsRoutes(apiAuthRoutes, dep.ProviderSettings)
 	DeclareRecordRoutes(apiAuthRoutes)
+	DeclareTestScheduleRoutes(apiAuthRoutes, dep.CheckerSchedule)
 	DeclareUsersRoutes(apiAuthRoutes, dep.User, lc)
 	DeclareSessionRoutes(apiAuthRoutes, dep.Session)
 }

internal/api/route/service.go

@@ -36,8 +36,12 @@ func DeclareZoneServiceRoutes(
 	zoneServiceUC happydns.ZoneServiceUsecase,
 	serviceUC happydns.ServiceUsecase,
 	zoneUC happydns.ZoneUsecase,
+	checkerUC happydns.CheckerUsecase,
+	checkResultUC happydns.CheckResultUsecase,
+	checkScheduler happydns.SchedulerUsecase,
+	tpc *controller.CheckerController,
 ) {
-	sc := controller.NewServiceController(zoneServiceUC, serviceUC, zoneUC)
+	sc := controller.NewServiceController(zoneServiceUC, serviceUC, zoneUC, checkResultUC)
 
 	apiZonesRoutes.PATCH("", sc.UpdateZoneService)
 
@@ -45,6 +49,19 @@ func DeclareZoneServiceRoutes(
 
 	apiZonesSubdomainServiceIDRoutes := apiZonesSubdomainRoutes.Group("/services/:serviceid")
 	apiZonesSubdomainServiceIDRoutes.Use(middleware.ServiceIdHandler(serviceUC))
-	apiZonesSubdomainServiceIDRoutes.GET("", sc.GetZoneService)
 	apiZonesSubdomainServiceIDRoutes.DELETE("", sc.DeleteZoneService)
+
+	apiZonesSubdomainServiceRoutes := apiZonesSubdomainRoutes.Group("/services/:serviceid")
+	apiZonesSubdomainServiceRoutes.Use(middleware.ServiceIdHandler(serviceUC), middleware.ServiceHandler(serviceUC))
+	apiZonesSubdomainServiceRoutes.GET("", sc.GetZoneService)
+
+	// Declare test result routes for service scope
+	DeclareScopedCheckersRoutes(
+		apiZonesSubdomainServiceRoutes,
+		checkerUC,
+		checkResultUC,
+		checkScheduler,
+		happydns.CheckScopeService,
+		tpc,
+	)
 }

internal/api/route/zone.go

@@ -36,11 +36,16 @@ func DeclareZoneRoutes(
 	zoneCorrApplier happydns.ZoneCorrectionApplierUsecase,
 	zoneServiceUC happydns.ZoneServiceUsecase,
 	serviceUC happydns.ServiceUsecase,
+	checkerUC happydns.CheckerUsecase,
+	checkResultUC happydns.CheckResultUsecase,
+	checkScheduler happydns.SchedulerUsecase,
+	tpc *controller.CheckerController,
 ) {
 	zc := controller.NewZoneController(
 		zoneUC,
 		domainUC,
 		zoneCorrApplier,
+		checkResultUC,
 	)
 
 	apiZonesRoutes := router.Group("/zone/:zoneid")
@@ -65,6 +70,10 @@ func DeclareZoneRoutes(
 		zoneServiceUC,
 		serviceUC,
 		zoneUC,
+		checkerUC,
+		checkResultUC,
+		checkScheduler,
+		tpc,
 	)
 
 	apiZonesRoutes.POST("/records", zc.AddRecords)

internal/app/admin.go

@@ -31,6 +31,7 @@ import (
 	"time"
 
 	"github.com/gin-gonic/gin"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 
 	admin "git.happydns.org/happyDomain/internal/api-admin/route"
 	providerUC "git.happydns.org/happyDomain/internal/usecase/provider"
@@ -56,12 +57,16 @@ func NewAdmin(app *App) *Admin {
 	// Prepare usecases (admin uses unrestricted provider access)
 	app.usecases.providerAdmin = providerUC.NewService(app.store, nil)
 
+	router.GET("/metrics", gin.WrapH(promhttp.Handler()))
+
 	admin.DeclareRoutes(
 		app.cfg,
 		router,
 		app.store,
 		admin.Dependencies{
 			AuthUser:              app.usecases.authUser,
+			Checker:               app.usecases.checker,
+			CheckScheduler:        app.checkScheduler,
 			Domain:                app.usecases.domain,
 			Provider:              app.usecases.providerAdmin,
 			RemoteZoneImporter:    app.usecases.orchestrator.RemoteZoneImporter,

internal/app/app.go

@@ -33,11 +33,14 @@ import (
 	api "git.happydns.org/happyDomain/internal/api/route"
 	"git.happydns.org/happyDomain/internal/captcha"
 	"git.happydns.org/happyDomain/internal/mailer"
+	"git.happydns.org/happyDomain/internal/metrics"
 	"git.happydns.org/happyDomain/internal/newsletter"
 	"git.happydns.org/happyDomain/internal/session"
 	"git.happydns.org/happyDomain/internal/storage"
 	"git.happydns.org/happyDomain/internal/usecase"
 	authuserUC "git.happydns.org/happyDomain/internal/usecase/authuser"
+	checkUC "git.happydns.org/happyDomain/internal/usecase/check"
+	checkresultUC "git.happydns.org/happyDomain/internal/usecase/checkresult"
 	domainUC "git.happydns.org/happyDomain/internal/usecase/domain"
 	domainlogUC "git.happydns.org/happyDomain/internal/usecase/domain_log"
 	"git.happydns.org/happyDomain/internal/usecase/orchestrator"
@@ -48,13 +51,18 @@ import (
 	zoneUC "git.happydns.org/happyDomain/internal/usecase/zone"
 	zoneServiceUC "git.happydns.org/happyDomain/internal/usecase/zone_service"
 	"git.happydns.org/happyDomain/model"
+	"git.happydns.org/happyDomain/pkg/domaininfo"
 	"git.happydns.org/happyDomain/web"
 )
 
 type Usecases struct {
 	authentication   happydns.AuthenticationUsecase
 	authUser         happydns.AuthUserUsecase
+	checker          happydns.CheckerUsecase
+	checkResult      happydns.CheckResultUsecase
+	checkerSchedule  happydns.CheckerScheduleUsecase
 	domain           happydns.DomainUsecase
+	domainInfo       happydns.DomainInfoUsecase
 	domainLog        happydns.DomainLogUsecase
 	provider         happydns.ProviderUsecase
 	providerAdmin    happydns.ProviderUsecase
@@ -81,6 +89,7 @@ type App struct {
 	router          *gin.Engine
 	srv             *http.Server
 	store           storage.Storage
+	checkScheduler  happydns.SchedulerUsecase
 	usecases        Usecases
 }
 
@@ -93,8 +102,12 @@ func NewApp(cfg *happydns.Options) *App {
 	app.initStorageEngine()
 	app.initNewsletter()
 	app.initInsights()
+	if err := app.initPlugins(); err != nil {
+		log.Fatalf("Plugin initialization error: %s", err)
+	}
 	app.initUsecases()
 	app.initCaptcha()
+	app.initCheckScheduler()
 	app.setupRouter()
 
 	return app
@@ -108,8 +121,12 @@ func NewAppWithStorage(cfg *happydns.Options, store storage.Storage) *App {
 
 	app.initMailer()
 	app.initNewsletter()
+	if err := app.initPlugins(); err != nil {
+		log.Fatalf("Plugin initialization error: %s", err)
+	}
 	app.initUsecases()
 	app.initCaptcha()
+	app.initCheckScheduler()
 	app.setupRouter()
 
 	return app
@@ -162,6 +179,9 @@ func (app *App) initStorageEngine() {
 		if err = app.store.MigrateSchema(); err != nil {
 			log.Fatal("Could not migrate database: ", err)
 		}
+
+		app.store = newInstrumentedStorage(app.store)
+		metrics.NewStorageStatsCollector(storage.NewStatsProvider(app.store))
 	}
 }
 
@@ -186,6 +206,22 @@ func (app *App) initInsights() {
 	}
 }
 
+func (app *App) initCheckScheduler() {
+	if app.cfg.DisableScheduler {
+		// Use a disabled scheduler that returns clear errors
+		app.checkScheduler = &disabledScheduler{}
+		return
+	}
+
+	app.checkScheduler = newCheckScheduler(
+		app.cfg,
+		app.store,
+		app.usecases.checker,
+		app.usecases.checkResult,
+		app.usecases.checkerSchedule,
+	)
+}
+
 func (app *App) initUsecases() {
 	sessionService := sessionUC.NewService(app.store)
 	authUserService := authuserUC.NewAuthUserUsecases(
@@ -207,6 +243,10 @@ func (app *App) initUsecases() {
 	app.usecases.service = serviceService
 	app.usecases.serviceSpecs = usecase.NewServiceSpecsUsecase()
 	app.usecases.zone = zoneService
+	app.usecases.domainInfo = usecase.NewDomainInfoUsecase(
+		domaininfo.GetDomainRDAPInfo,
+		domaininfo.GetDomainWhoisInfo,
+	)
 	app.usecases.domainLog = domainLogService
 
 	domainService := domainUC.NewService(
@@ -234,6 +274,9 @@ func (app *App) initUsecases() {
 	app.usecases.authUser = authUserService
 	app.usecases.resolver = usecase.NewResolverUsecase(app.cfg)
 	app.usecases.session = sessionService
+	app.usecases.checker = checkUC.NewCheckerUsecase(app.cfg, app.store, app.store)
+	app.usecases.checkerSchedule = checkresultUC.NewCheckScheduleUsecase(app.store, app.cfg, app.store, app.usecases.checker)
+	app.usecases.checkResult = checkresultUC.NewCheckResultUsecase(app.store, app.cfg, app.usecases.checker, app.usecases.checkerSchedule)
 
 	app.usecases.orchestrator = orchestrator.NewOrchestrator(
 		domainLogService,
@@ -255,7 +298,7 @@ func (app *App) setupRouter() {
 
 	gin.ForceConsoleColor()
 	app.router = gin.New()
-	app.router.Use(gin.Logger(), gin.Recovery(), sessions.Sessions(
+	app.router.Use(gin.Logger(), gin.Recovery(), metrics.HTTPMiddleware(), sessions.Sessions(
 		session.COOKIE_NAME,
 		session.NewSessionStore(app.cfg, app.store, []byte(app.cfg.JWTSecretKey)),
 	))
@@ -275,7 +318,12 @@ func (app *App) setupRouter() {
 			Authentication:        app.usecases.authentication,
 			AuthUser:              app.usecases.authUser,
 			CaptchaVerifier:       app.captchaVerifier,
+			Checker:               app.usecases.checker,
+			CheckResult:           app.usecases.checkResult,
+			CheckerSchedule:       app.usecases.checkerSchedule,
+			CheckScheduler:        app.checkScheduler,
 			Domain:                app.usecases.domain,
+			DomainInfo:            app.usecases.domainInfo,
 			DomainLog:             app.usecases.domainLog,
 			FailureTracker:        app.failureTracker,
 			Provider:              app.usecases.provider,
@@ -308,6 +356,8 @@ func (app *App) Start() {
 		go app.insights.Run()
 	}
 
+	go app.checkScheduler.Run()
+
 	log.Printf("Public interface listening on %s\n", app.cfg.Bind)
 	if err := app.srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
 		log.Fatalf("listen: %s\n", err)
@@ -333,4 +383,6 @@ func (app *App) Stop() {
 	if app.failureTracker != nil {
 		app.failureTracker.Close()
 	}
+
+	app.checkScheduler.Close()
 }

internal/app/checkscheduler.go

@@ -0,0 +1,641 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package app
+
+import (
+	"container/heap"
+	"context"
+	"fmt"
+	"log"
+	"runtime"
+	"sync"
+	"time"
+
+	"git.happydns.org/happyDomain/internal/metrics"
+	"git.happydns.org/happyDomain/internal/storage"
+	"git.happydns.org/happyDomain/model"
+)
+
+const (
+	SchedulerCheckInterval     = 1 * time.Minute // How often to check for due tests
+	SchedulerCleanupInterval   = 24 * time.Hour  // How often to clean up old executions
+	SchedulerDiscoveryInterval = 1 * time.Hour   // How often to auto-discover new targets
+	CheckExecutionTimeout      = 5 * time.Minute // Max time for a single check
+	MaxRetries                 = 3               // Max retry attempts for failed checks
+)
+
+// Priority levels for test execution queue
+const (
+	PriorityOnDemand  = iota // On-demand tests (highest priority)
+	PriorityOverdue          // Overdue scheduled tests
+	PriorityScheduled        // Regular scheduled tests
+)
+
+// checkScheduler manages background test execution
+type checkScheduler struct {
+	cfg              *happydns.Options
+	store            storage.Storage
+	checkerUsecase   happydns.CheckerUsecase
+	resultUsecase    happydns.CheckResultUsecase
+	scheduleUsecase  happydns.CheckerScheduleUsecase
+	stop             chan struct{}   // closed to stop the main Run loop
+	stopWorkers      chan struct{}   // closed to stop all workers simultaneously
+	runNowChan       chan *queueItem // on-demand items routed through the main loop
+	workAvail        chan struct{}   // non-blocking signals that queue has new work
+	queue            *priorityQueue
+	activeExecutions map[string]*activeExecution
+	workers          []*worker
+	mu               sync.RWMutex
+	wg               sync.WaitGroup
+	runtimeEnabled   bool
+	running          bool
+}
+
+// activeExecution tracks a running test execution
+type activeExecution struct {
+	execution *happydns.CheckExecution
+	cancel    context.CancelFunc
+	startTime time.Time
+}
+
+// queueItem represents a test execution request in the queue
+type queueItem struct {
+	schedule  *happydns.CheckerSchedule
+	execution *happydns.CheckExecution
+	priority  int
+	queuedAt  time.Time
+	retries   int
+}
+
+// --- container/heap implementation for priorityQueue ---
+
+// priorityHeap is the underlying heap, ordered by priority then arrival time.
+type priorityHeap []*queueItem
+
+func (h priorityHeap) Len() int { return len(h) }
+func (h priorityHeap) Less(i, j int) bool {
+	if h[i].priority != h[j].priority {
+		return h[i].priority < h[j].priority
+	}
+	return h[i].queuedAt.Before(h[j].queuedAt)
+}
+func (h priorityHeap) Swap(i, j int) { h[i], h[j] = h[j], h[i] }
+func (h *priorityHeap) Push(x any)   { *h = append(*h, x.(*queueItem)) }
+func (h *priorityHeap) Pop() any {
+	old := *h
+	n := len(old)
+	x := old[n-1]
+	old[n-1] = nil // avoid memory leak
+	*h = old[:n-1]
+	return x
+}
+
+// priorityQueue is a thread-safe min-heap of queueItems.
+type priorityQueue struct {
+	h  priorityHeap
+	mu sync.Mutex
+}
+
+func newPriorityQueue() *priorityQueue {
+	pq := &priorityQueue{}
+	heap.Init(&pq.h)
+	return pq
+}
+
+// Push adds an item to the queue.
+func (q *priorityQueue) Push(item *queueItem) {
+	q.mu.Lock()
+	defer q.mu.Unlock()
+	heap.Push(&q.h, item)
+}
+
+// Pop removes and returns the highest-priority item, or nil if empty.
+func (q *priorityQueue) Pop() *queueItem {
+	q.mu.Lock()
+	defer q.mu.Unlock()
+	if q.h.Len() == 0 {
+		return nil
+	}
+	return heap.Pop(&q.h).(*queueItem)
+}
+
+// Len returns the queue length.
+func (q *priorityQueue) Len() int {
+	q.mu.Lock()
+	defer q.mu.Unlock()
+	return q.h.Len()
+}
+
+// worker processes tests from the queue
+type worker struct {
+	id        int
+	scheduler *checkScheduler
+}
+
+// newCheckScheduler creates a new test scheduler
+func newCheckScheduler(
+	cfg *happydns.Options,
+	store storage.Storage,
+	checkerUsecase happydns.CheckerUsecase,
+	resultUsecase happydns.CheckResultUsecase,
+	scheduleUsecase happydns.CheckerScheduleUsecase,
+) *checkScheduler {
+	numWorkers := cfg.TestWorkers
+	if numWorkers <= 0 {
+		numWorkers = runtime.NumCPU()
+	}
+
+	scheduler := &checkScheduler{
+		cfg:              cfg,
+		store:            store,
+		checkerUsecase:   checkerUsecase,
+		resultUsecase:    resultUsecase,
+		scheduleUsecase:  scheduleUsecase,
+		stop:             make(chan struct{}),
+		stopWorkers:      make(chan struct{}),
+		runNowChan:       make(chan *queueItem, 100),
+		workAvail:        make(chan struct{}, numWorkers),
+		queue:            newPriorityQueue(),
+		activeExecutions: make(map[string]*activeExecution),
+		workers:          make([]*worker, numWorkers),
+		runtimeEnabled:   true,
+	}
+
+	for i := 0; i < numWorkers; i++ {
+		scheduler.workers[i] = &worker{
+			id:        i,
+			scheduler: scheduler,
+		}
+	}
+
+	return scheduler
+}
+
+// enqueue pushes an item to the priority queue and wakes one idle worker.
+func (s *checkScheduler) enqueue(item *queueItem) {
+	s.queue.Push(item)
+	metrics.SchedulerQueueDepth.Set(float64(s.queue.Len()))
+	select {
+	case s.workAvail <- struct{}{}:
+	default:
+		// All workers are already busy or already notified; they will drain
+		// the queue on their own after finishing the current item.
+	}
+}
+
+// Close stops the scheduler and waits for all workers to finish.
+func (s *checkScheduler) Close() {
+	log.Println("Stopping test scheduler...")
+
+	// Unblock the main Run loop.
+	close(s.stop)
+
+	// Unblock all workers simultaneously.
+	close(s.stopWorkers)
+
+	// Cancel all active test executions.
+	s.mu.Lock()
+	for _, exec := range s.activeExecutions {
+		exec.cancel()
+	}
+	s.mu.Unlock()
+
+	// Wait for all workers to finish their current item.
+	s.wg.Wait()
+
+	log.Println("Check scheduler stopped")
+}
+
+// Run starts the scheduler main loop. It must not be called more than once.
+func (s *checkScheduler) Run() {
+	s.mu.Lock()
+	s.running = true
+	s.mu.Unlock()
+
+	defer func() {
+		s.mu.Lock()
+		s.running = false
+		s.mu.Unlock()
+	}()
+
+	log.Printf("Starting test scheduler with %d workers...\n", len(s.workers))
+
+	// Reschedule overdue tests before starting workers so that tests missed
+	// during a server suspend or shutdown are spread into the near future
+	// instead of all firing at once.
+	if n, err := s.scheduleUsecase.RescheduleOverdueChecks(); err != nil {
+		log.Printf("Warning: failed to reschedule overdue tests: %v\n", err)
+	} else if n > 0 {
+		log.Printf("Rescheduled %d overdue test(s) into the near future\n", n)
+	}
+
+	// Start workers
+	for _, w := range s.workers {
+		s.wg.Add(1)
+		go w.run(&s.wg)
+	}
+
+	// Main scheduling loop
+	checkTicker := time.NewTicker(SchedulerCheckInterval)
+	cleanupTicker := time.NewTicker(SchedulerCleanupInterval)
+	discoveryTicker := time.NewTicker(SchedulerDiscoveryInterval)
+	defer checkTicker.Stop()
+	defer cleanupTicker.Stop()
+	defer discoveryTicker.Stop()
+
+	// Initial discovery: create default schedules for all existing targets
+	if err := s.scheduleUsecase.DiscoverAndEnsureSchedules(); err != nil {
+		log.Printf("Warning: schedule discovery encountered errors: %v\n", err)
+	}
+	// Initial check
+	s.checkSchedules()
+
+	for {
+		select {
+		case <-checkTicker.C:
+			s.checkSchedules()
+
+		case <-cleanupTicker.C:
+			s.cleanup()
+
+		case <-discoveryTicker.C:
+			if err := s.scheduleUsecase.DiscoverAndEnsureSchedules(); err != nil {
+				log.Printf("Warning: schedule discovery encountered errors: %v\n", err)
+			}
+
+		case item := <-s.runNowChan:
+			s.enqueue(item)
+
+		case <-s.stop:
+			return
+		}
+	}
+}
+
+// checkSchedules checks for due tests and queues them
+func (s *checkScheduler) checkSchedules() {
+	s.mu.RLock()
+	enabled := s.runtimeEnabled
+	s.mu.RUnlock()
+	if !enabled {
+		return
+	}
+
+	dueSchedules, err := s.scheduleUsecase.ListDueSchedules()
+	if err != nil {
+		log.Printf("Error listing due schedules: %v\n", err)
+		return
+	}
+
+	now := time.Now()
+	for _, schedule := range dueSchedules {
+		// Determine priority based on how overdue the test is
+		priority := PriorityScheduled
+		if schedule.NextRun.Add(schedule.Interval).Before(now) {
+			priority = PriorityOverdue
+		}
+
+		// Create execution record
+		execution := &happydns.CheckExecution{
+			ScheduleId:  &schedule.Id,
+			CheckerName: schedule.CheckerName,
+			OwnerId:     schedule.OwnerId,
+			InsideType:  schedule.InsideType,
+			InsideId:    schedule.InsideId,
+			TargetType:  schedule.TargetType,
+			TargetId:    schedule.TargetId,
+			Status:      happydns.CheckExecutionPending,
+			StartedAt:   now,
+			Options:     schedule.Options,
+		}
+
+		if err := s.resultUsecase.CreateCheckExecution(execution); err != nil {
+			log.Printf("Error creating execution for schedule %s: %v\n", schedule.Id.String(), err)
+			continue
+		}
+
+		s.enqueue(&queueItem{
+			schedule:  schedule,
+			execution: execution,
+			priority:  priority,
+			queuedAt:  now,
+			retries:   0,
+		})
+	}
+
+	// Mark scheduler run
+	if err := s.store.CheckSchedulerRun(); err != nil {
+		log.Printf("Error marking scheduler run: %v\n", err)
+	}
+}
+
+// TriggerOnDemandCheck triggers an immediate test execution.
+// It creates the execution record synchronously (so the caller gets an ID back)
+// and then routes the item through runNowChan so the main loop controls
+// all queue insertions.
+func (s *checkScheduler) TriggerOnDemandCheck(checkerName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, insideScopeType *happydns.CheckScopeType, insideId *happydns.Identifier, ownerId happydns.Identifier, options happydns.CheckerOptions) (happydns.Identifier, error) {
+	schedule := &happydns.CheckerSchedule{
+		CheckerName: checkerName,
+		OwnerId:     ownerId,
+		TargetType:  targetType,
+		TargetId:    targetId,
+		InsideType:  insideScopeType,
+		InsideId:    insideId,
+		Interval:    0, // On-demand, no interval
+		Enabled:     true,
+		Options:     options,
+	}
+
+	now := time.Now()
+
+	execution := &happydns.CheckExecution{
+		ScheduleId:  nil,
+		CheckerName: checkerName,
+		OwnerId:     ownerId,
+		InsideType:  insideScopeType,
+		InsideId:    insideId,
+		TargetType:  targetType,
+		TargetId:    targetId,
+		Status:      happydns.CheckExecutionPending,
+		StartedAt:   now,
+		Options:     options,
+	}
+
+	if err := s.resultUsecase.CreateCheckExecution(execution); err != nil {
+		return happydns.Identifier{}, err
+	}
+
+	item := &queueItem{
+		schedule:  schedule,
+		execution: execution,
+		priority:  PriorityOnDemand,
+		queuedAt:  now,
+		retries:   0,
+	}
+
+	// Route through the main loop when possible; fall back to direct enqueue
+	// if the channel is full so that the caller never blocks.
+	select {
+	case s.runNowChan <- item:
+	default:
+		s.enqueue(item)
+	}
+
+	return execution.Id, nil
+}
+
+// GetSchedulerStatus returns a snapshot of the current scheduler state
+func (s *checkScheduler) GetSchedulerStatus() happydns.SchedulerStatus {
+	s.mu.RLock()
+	activeCount := len(s.activeExecutions)
+	running := s.running
+	runtimeEnabled := s.runtimeEnabled
+	s.mu.RUnlock()
+
+	nextSchedules, _ := s.scheduleUsecase.ListUpcomingSchedules(20)
+
+	return happydns.SchedulerStatus{
+		ConfigEnabled:  !s.cfg.DisableScheduler,
+		RuntimeEnabled: runtimeEnabled,
+		Running:        running,
+		WorkerCount:    len(s.workers),
+		QueueSize:      s.queue.Len(),
+		ActiveCount:    activeCount,
+		NextSchedules:  nextSchedules,
+	}
+}
+
+// SetEnabled enables or disables the scheduler at runtime
+func (s *checkScheduler) SetEnabled(enabled bool) error {
+	s.mu.Lock()
+	wasEnabled := s.runtimeEnabled
+	s.runtimeEnabled = enabled
+	s.mu.Unlock()
+
+	if enabled && !wasEnabled {
+		// Spread out any overdue tests to avoid a thundering herd, then
+		// immediately enqueue whatever is now due.
+		if n, err := s.scheduleUsecase.RescheduleOverdueChecks(); err != nil {
+			log.Printf("Warning: failed to reschedule overdue tests on re-enable: %v\n", err)
+		} else if n > 0 {
+			log.Printf("Rescheduled %d overdue test(s) after scheduler re-enable\n", n)
+		}
+		s.checkSchedules()
+	}
+
+	return nil
+}
+
+// RescheduleUpcomingChecks randomizes the next run time of all enabled schedules
+// within their respective intervals, delegating to the schedule usecase.
+func (s *checkScheduler) RescheduleUpcomingChecks() (int, error) {
+	return s.scheduleUsecase.RescheduleUpcomingChecks()
+}
+
+// cleanup removes old execution records and expired test results
+func (s *checkScheduler) cleanup() {
+	log.Println("Running scheduler cleanup...")
+
+	// Delete completed/failed execution records older than 7 days
+	if err := s.resultUsecase.DeleteCompletedExecutions(7 * 24 * time.Hour); err != nil {
+		log.Printf("Error cleaning up old executions: %v\n", err)
+	}
+
+	// Delete test results older than the configured retention period
+	if err := s.resultUsecase.CleanupOldResults(); err != nil {
+		log.Printf("Error cleaning up old test results: %v\n", err)
+	}
+
+	log.Println("Scheduler cleanup complete")
+}
+
+// run is the worker's main loop. It drains the queue eagerly and waits for a
+// workAvail signal when idle, rather than sleeping on a fixed timer.
+func (w *worker) run(wg *sync.WaitGroup) {
+	defer wg.Done()
+
+	log.Printf("Worker %d started\n", w.id)
+
+	for {
+		// Drain: try to grab work before blocking.
+		if item := w.scheduler.queue.Pop(); item != nil {
+			metrics.SchedulerQueueDepth.Set(float64(w.scheduler.queue.Len()))
+			w.executeCheck(item)
+			continue
+		}
+
+		// Queue is empty; wait for new work or a stop signal.
+		select {
+		case <-w.scheduler.workAvail:
+			// Loop back to attempt a Pop.
+		case <-w.scheduler.stopWorkers:
+			log.Printf("Worker %d stopped\n", w.id)
+			return
+		}
+	}
+}
+
+// executeCheck runs a checker and stores the result.
+func (w *worker) executeCheck(item *queueItem) {
+	ctx, cancel := context.WithTimeout(context.Background(), CheckExecutionTimeout)
+	defer cancel()
+
+	execution := item.execution
+	schedule := item.schedule
+
+	metrics.SchedulerActiveWorkers.Inc()
+	checkStart := time.Now()
+	defer func() {
+		metrics.SchedulerActiveWorkers.Dec()
+		metrics.SchedulerCheckDuration.WithLabelValues(schedule.CheckerName).Observe(time.Since(checkStart).Seconds())
+	}()
+
+	// Always update schedule NextRun after execution, whether it succeeds or fails.
+	// This prevents the schedule from being re-queued on the next tick if the test fails.
+	if execution.ScheduleId != nil {
+		defer func() {
+			if err := w.scheduler.scheduleUsecase.UpdateScheduleAfterRun(*execution.ScheduleId); err != nil {
+				log.Printf("Worker %d: Error updating schedule after run: %v\n", w.id, err)
+			}
+		}()
+	}
+
+	// Mark execution as running
+	execution.Status = happydns.CheckExecutionRunning
+	if err := w.scheduler.resultUsecase.UpdateCheckExecution(execution); err != nil {
+		log.Printf("Worker %d: Error updating execution status: %v\n", w.id, err)
+		_ = w.scheduler.resultUsecase.FailCheckExecution(execution.Id, err.Error())
+		return
+	}
+
+	// Track active execution
+	startTime := time.Now()
+	w.scheduler.mu.Lock()
+	w.scheduler.activeExecutions[execution.Id.String()] = &activeExecution{
+		execution: execution,
+		cancel:    cancel,
+		startTime: startTime,
+	}
+	w.scheduler.mu.Unlock()
+
+	defer func() {
+		w.scheduler.mu.Lock()
+		delete(w.scheduler.activeExecutions, execution.Id.String())
+		w.scheduler.mu.Unlock()
+	}()
+
+	// Get the checker
+	checker, err := w.scheduler.checkerUsecase.GetChecker(schedule.CheckerName)
+	if err != nil {
+		errMsg := fmt.Sprintf("checker not found: %s - %v", schedule.CheckerName, err)
+		log.Printf("Worker %d: %s\n", w.id, errMsg)
+		_ = w.scheduler.resultUsecase.FailCheckExecution(execution.Id, errMsg)
+		return
+	}
+
+	var domainId, serviceId *happydns.Identifier
+	switch schedule.TargetType {
+	case happydns.CheckScopeDomain:
+		domainId = &schedule.TargetId
+	case happydns.CheckScopeService:
+		serviceId = &schedule.TargetId
+	}
+
+	// Merge options: global defaults < user opts < domain/service opts < schedule/on-demand opts < auto-fill
+	mergedOptions, mergeErr := w.scheduler.checkerUsecase.BuildMergedCheckerOptions(schedule.CheckerName, &schedule.OwnerId, domainId, serviceId, schedule.Options)
+	if mergeErr != nil {
+		// Non-fatal: fall back to schedule-only options
+		log.Printf("Worker %d: warning, could not prepare checker options for %s: %v\n", w.id, schedule.CheckerName, mergeErr)
+		mergedOptions = schedule.Options
+	}
+
+	// Prepare metadata
+	meta := map[string]string{
+		"target_type": schedule.TargetType.String(),
+		"target_id":   schedule.TargetId.String(),
+	}
+
+	// Run the check synchronously with context-based timeout.
+	// The checker is responsible for honouring ctx cancellation.
+	checkResult, testErr := w.runCheckSafe(ctx, checker, mergedOptions, meta)
+
+	duration := time.Since(startTime)
+
+	// Build the result record, enriching the partial CheckResult from RunCheck
+	// with execution metadata (owner, target, duration, etc.).
+	result := &happydns.CheckResult{
+		CheckerName:    schedule.CheckerName,
+		CheckType:      schedule.TargetType,
+		TargetId:       schedule.TargetId,
+		OwnerId:        schedule.OwnerId,
+		ExecutedAt:     startTime,
+		ScheduledCheck: execution.ScheduleId != nil,
+		Options:        schedule.Options,
+		Duration:       duration,
+	}
+
+	if checkResult != nil {
+		result.Status = checkResult.Status
+		result.StatusLine = checkResult.StatusLine
+		result.Report = checkResult.Report
+		if testErr != nil {
+			result.Error = testErr.Error()
+		}
+	} else {
+		result.Status = happydns.CheckResultStatusUnknown
+		result.StatusLine = "Check execution failed"
+		if testErr != nil {
+			result.Error = testErr.Error()
+		} else {
+			result.Error = "Unknown check execution error"
+		}
+	}
+
+	// Record check status metric
+	metrics.SchedulerChecksTotal.WithLabelValues(schedule.CheckerName, result.Status.String()).Inc()
+
+	// Save the result
+	if err := w.scheduler.resultUsecase.CreateCheckResult(result); err != nil {
+		log.Printf("Worker %d: Error saving test result: %v\n", w.id, err)
+		_ = w.scheduler.resultUsecase.FailCheckExecution(execution.Id, err.Error())
+		return
+	}
+
+	// Complete the execution
+	if err := w.scheduler.resultUsecase.CompleteCheckExecution(execution.Id, result.Id); err != nil {
+		log.Printf("Worker %d: Error completing execution: %v\n", w.id, err)
+		return
+	}
+
+	log.Printf("Worker %d: Completed test %s for target %s (status: %d, duration: %v)\n",
+		w.id, schedule.CheckerName, schedule.TargetId.String(), result.Status, duration)
+}
+
+// runCheckSafe calls checker.RunCheck and recovers from panics.
+func (w *worker) runCheckSafe(ctx context.Context, checker happydns.Checker, options happydns.CheckerOptions, meta map[string]string) (result *happydns.CheckResult, err error) {
+	defer func() {
+		if r := recover(); r != nil {
+			err = fmt.Errorf("checker panicked: %v", r)
+		}
+	}()
+	return checker.RunCheck(ctx, options, meta)
+}

internal/app/disabledscheduler.go

@@ -0,0 +1,58 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package app
+
+import (
+	"fmt"
+
+	"git.happydns.org/happyDomain/model"
+)
+
+// disabledScheduler is a no-op implementation of SchedulerUsecase used when the
+// scheduler is disabled in configuration.
+type disabledScheduler struct{}
+
+func (d *disabledScheduler) Run()   {}
+func (d *disabledScheduler) Close() {}
+
+func (d *disabledScheduler) TriggerOnDemandCheck(checkName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, _ *happydns.CheckScopeType, _ *happydns.Identifier, userId happydns.Identifier, options happydns.CheckerOptions) (happydns.Identifier, error) {
+	return happydns.Identifier{}, fmt.Errorf("test scheduler is disabled in configuration")
+}
+
+// GetSchedulerStatus returns a status indicating the scheduler is disabled
+func (d *disabledScheduler) GetSchedulerStatus() happydns.SchedulerStatus {
+	return happydns.SchedulerStatus{
+		ConfigEnabled:  false,
+		RuntimeEnabled: false,
+		Running:        false,
+	}
+}
+
+// SetEnabled returns an error since the scheduler is disabled in configuration
+func (d *disabledScheduler) SetEnabled(enabled bool) error {
+	return fmt.Errorf("scheduler is disabled in configuration, cannot enable at runtime")
+}
+
+// RescheduleUpcomingChecks returns an error since the scheduler is disabled
+func (d *disabledScheduler) RescheduleUpcomingChecks() (int, error) {
+	return 0, fmt.Errorf("test scheduler is disabled in configuration")
+}

internal/app/instrumented_storage.go

@@ -0,0 +1,624 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package app
+
+import (
+	"time"
+
+	"git.happydns.org/happyDomain/internal/metrics"
+	"git.happydns.org/happyDomain/internal/storage"
+	"git.happydns.org/happyDomain/model"
+)
+
+// instrumentedStorage wraps a storage.Storage to record Prometheus metrics for
+// every operation.
+type instrumentedStorage struct {
+	inner storage.Storage
+}
+
+// newInstrumentedStorage wraps the given Storage with metrics instrumentation.
+func newInstrumentedStorage(s storage.Storage) storage.Storage {
+	return &instrumentedStorage{inner: s}
+}
+
+// observe records the duration and outcome of a storage operation.
+func observeStorage(operation, entity string, start time.Time, err error) {
+	status := "success"
+	if err != nil {
+		status = "error"
+	}
+	metrics.StorageOperationsTotal.WithLabelValues(operation, entity, status).Inc()
+	metrics.StorageOperationDuration.WithLabelValues(operation, entity).Observe(time.Since(start).Seconds())
+}
+
+// Schema / lifecycle
+
+func (s *instrumentedStorage) SchemaVersion() int {
+	return s.inner.SchemaVersion()
+}
+
+func (s *instrumentedStorage) MigrateSchema() error {
+	return s.inner.MigrateSchema()
+}
+
+func (s *instrumentedStorage) Close() error {
+	return s.inner.Close()
+}
+
+// AuthUser
+
+func (s *instrumentedStorage) ListAllAuthUsers() (ret happydns.Iterator[happydns.UserAuth], err error) {
+	start := time.Now()
+	ret, err = s.inner.ListAllAuthUsers()
+	observeStorage("list", "authuser", start, err)
+	return
+}
+
+func (s *instrumentedStorage) GetAuthUser(id happydns.Identifier) (ret *happydns.UserAuth, err error) {
+	start := time.Now()
+	ret, err = s.inner.GetAuthUser(id)
+	observeStorage("get", "authuser", start, err)
+	return
+}
+
+func (s *instrumentedStorage) GetAuthUserByEmail(email string) (ret *happydns.UserAuth, err error) {
+	start := time.Now()
+	ret, err = s.inner.GetAuthUserByEmail(email)
+	observeStorage("get", "authuser", start, err)
+	return
+}
+
+func (s *instrumentedStorage) AuthUserExists(email string) (ret bool, err error) {
+	start := time.Now()
+	ret, err = s.inner.AuthUserExists(email)
+	observeStorage("get", "authuser", start, err)
+	return
+}
+
+func (s *instrumentedStorage) CreateAuthUser(user *happydns.UserAuth) (err error) {
+	start := time.Now()
+	err = s.inner.CreateAuthUser(user)
+	observeStorage("create", "authuser", start, err)
+	return
+}
+
+func (s *instrumentedStorage) UpdateAuthUser(user *happydns.UserAuth) (err error) {
+	start := time.Now()
+	err = s.inner.UpdateAuthUser(user)
+	observeStorage("update", "authuser", start, err)
+	return
+}
+
+func (s *instrumentedStorage) DeleteAuthUser(user *happydns.UserAuth) (err error) {
+	start := time.Now()
+	err = s.inner.DeleteAuthUser(user)
+	observeStorage("delete", "authuser", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ClearAuthUsers() (err error) {
+	start := time.Now()
+	err = s.inner.ClearAuthUsers()
+	observeStorage("delete", "authuser", start, err)
+	return
+}
+
+// Domain
+
+func (s *instrumentedStorage) ListAllDomains() (ret happydns.Iterator[happydns.Domain], err error) {
+	start := time.Now()
+	ret, err = s.inner.ListAllDomains()
+	observeStorage("list", "domain", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ListDomains(user *happydns.User) (ret []*happydns.Domain, err error) {
+	start := time.Now()
+	ret, err = s.inner.ListDomains(user)
+	observeStorage("list", "domain", start, err)
+	return
+}
+
+func (s *instrumentedStorage) GetDomain(domainid happydns.Identifier) (ret *happydns.Domain, err error) {
+	start := time.Now()
+	ret, err = s.inner.GetDomain(domainid)
+	observeStorage("get", "domain", start, err)
+	return
+}
+
+func (s *instrumentedStorage) GetDomainByDN(user *happydns.User, fqdn string) (ret []*happydns.Domain, err error) {
+	start := time.Now()
+	ret, err = s.inner.GetDomainByDN(user, fqdn)
+	observeStorage("get", "domain", start, err)
+	return
+}
+
+func (s *instrumentedStorage) CreateDomain(domain *happydns.Domain) (err error) {
+	start := time.Now()
+	err = s.inner.CreateDomain(domain)
+	observeStorage("create", "domain", start, err)
+	return
+}
+
+func (s *instrumentedStorage) UpdateDomain(domain *happydns.Domain) (err error) {
+	start := time.Now()
+	err = s.inner.UpdateDomain(domain)
+	observeStorage("update", "domain", start, err)
+	return
+}
+
+func (s *instrumentedStorage) DeleteDomain(domainid happydns.Identifier) (err error) {
+	start := time.Now()
+	err = s.inner.DeleteDomain(domainid)
+	observeStorage("delete", "domain", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ClearDomains() (err error) {
+	start := time.Now()
+	err = s.inner.ClearDomains()
+	observeStorage("delete", "domain", start, err)
+	return
+}
+
+// DomainLog
+
+func (s *instrumentedStorage) ListAllDomainLogs() (ret happydns.Iterator[happydns.DomainLogWithDomainId], err error) {
+	start := time.Now()
+	ret, err = s.inner.ListAllDomainLogs()
+	observeStorage("list", "domain_log", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ListDomainLogs(domain *happydns.Domain) (ret []*happydns.DomainLog, err error) {
+	start := time.Now()
+	ret, err = s.inner.ListDomainLogs(domain)
+	observeStorage("list", "domain_log", start, err)
+	return
+}
+
+func (s *instrumentedStorage) CreateDomainLog(domain *happydns.Domain, log *happydns.DomainLog) (err error) {
+	start := time.Now()
+	err = s.inner.CreateDomainLog(domain, log)
+	observeStorage("create", "domain_log", start, err)
+	return
+}
+
+func (s *instrumentedStorage) UpdateDomainLog(domain *happydns.Domain, log *happydns.DomainLog) (err error) {
+	start := time.Now()
+	err = s.inner.UpdateDomainLog(domain, log)
+	observeStorage("update", "domain_log", start, err)
+	return
+}
+
+func (s *instrumentedStorage) DeleteDomainLog(domain *happydns.Domain, log *happydns.DomainLog) (err error) {
+	start := time.Now()
+	err = s.inner.DeleteDomainLog(domain, log)
+	observeStorage("delete", "domain_log", start, err)
+	return
+}
+
+// Insight
+
+func (s *instrumentedStorage) InsightsRun() (err error) {
+	start := time.Now()
+	err = s.inner.InsightsRun()
+	observeStorage("run", "insight", start, err)
+	return
+}
+
+func (s *instrumentedStorage) LastInsightsRun() (t *time.Time, id happydns.Identifier, err error) {
+	start := time.Now()
+	t, id, err = s.inner.LastInsightsRun()
+	observeStorage("get", "insight", start, err)
+	return
+}
+
+// Provider
+
+func (s *instrumentedStorage) ListAllProviders() (ret happydns.Iterator[happydns.ProviderMessage], err error) {
+	start := time.Now()
+	ret, err = s.inner.ListAllProviders()
+	observeStorage("list", "provider", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ListProviders(user *happydns.User) (ret happydns.ProviderMessages, err error) {
+	start := time.Now()
+	ret, err = s.inner.ListProviders(user)
+	observeStorage("list", "provider", start, err)
+	return
+}
+
+func (s *instrumentedStorage) GetProvider(prvdid happydns.Identifier) (ret *happydns.ProviderMessage, err error) {
+	start := time.Now()
+	ret, err = s.inner.GetProvider(prvdid)
+	observeStorage("get", "provider", start, err)
+	return
+}
+
+func (s *instrumentedStorage) CreateProvider(prvd *happydns.Provider) (err error) {
+	start := time.Now()
+	err = s.inner.CreateProvider(prvd)
+	observeStorage("create", "provider", start, err)
+	return
+}
+
+func (s *instrumentedStorage) UpdateProvider(prvd *happydns.Provider) (err error) {
+	start := time.Now()
+	err = s.inner.UpdateProvider(prvd)
+	observeStorage("update", "provider", start, err)
+	return
+}
+
+func (s *instrumentedStorage) DeleteProvider(prvdid happydns.Identifier) (err error) {
+	start := time.Now()
+	err = s.inner.DeleteProvider(prvdid)
+	observeStorage("delete", "provider", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ClearProviders() (err error) {
+	start := time.Now()
+	err = s.inner.ClearProviders()
+	observeStorage("delete", "provider", start, err)
+	return
+}
+
+// Session
+
+func (s *instrumentedStorage) ListAllSessions() (ret happydns.Iterator[happydns.Session], err error) {
+	start := time.Now()
+	ret, err = s.inner.ListAllSessions()
+	observeStorage("list", "session", start, err)
+	return
+}
+
+func (s *instrumentedStorage) GetSession(sessionid string) (ret *happydns.Session, err error) {
+	start := time.Now()
+	ret, err = s.inner.GetSession(sessionid)
+	observeStorage("get", "session", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ListAuthUserSessions(user *happydns.UserAuth) (ret []*happydns.Session, err error) {
+	start := time.Now()
+	ret, err = s.inner.ListAuthUserSessions(user)
+	observeStorage("list", "session", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ListUserSessions(userid happydns.Identifier) (ret []*happydns.Session, err error) {
+	start := time.Now()
+	ret, err = s.inner.ListUserSessions(userid)
+	observeStorage("list", "session", start, err)
+	return
+}
+
+func (s *instrumentedStorage) UpdateSession(session *happydns.Session) (err error) {
+	start := time.Now()
+	err = s.inner.UpdateSession(session)
+	observeStorage("update", "session", start, err)
+	return
+}
+
+func (s *instrumentedStorage) DeleteSession(sessionid string) (err error) {
+	start := time.Now()
+	err = s.inner.DeleteSession(sessionid)
+	observeStorage("delete", "session", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ClearSessions() (err error) {
+	start := time.Now()
+	err = s.inner.ClearSessions()
+	observeStorage("delete", "session", start, err)
+	return
+}
+
+// CheckResult / CheckSchedule / CheckExecution
+
+func (s *instrumentedStorage) ListCheckResults(checkName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, limit int) (ret []*happydns.CheckResult, err error) {
+	start := time.Now()
+	ret, err = s.inner.ListCheckResults(checkName, targetType, targetId, limit)
+	observeStorage("list", "check_result", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ListCheckResultsByPlugin(userId happydns.Identifier, checkName string, limit int) (ret []*happydns.CheckResult, err error) {
+	start := time.Now()
+	ret, err = s.inner.ListCheckResultsByPlugin(userId, checkName, limit)
+	observeStorage("list", "check_result", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ListCheckResultsByUser(userId happydns.Identifier, limit int) (ret []*happydns.CheckResult, err error) {
+	start := time.Now()
+	ret, err = s.inner.ListCheckResultsByUser(userId, limit)
+	observeStorage("list", "check_result", start, err)
+	return
+}
+
+func (s *instrumentedStorage) GetCheckResult(checkName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, resultId happydns.Identifier) (ret *happydns.CheckResult, err error) {
+	start := time.Now()
+	ret, err = s.inner.GetCheckResult(checkName, targetType, targetId, resultId)
+	observeStorage("get", "check_result", start, err)
+	return
+}
+
+func (s *instrumentedStorage) CreateCheckResult(result *happydns.CheckResult) (err error) {
+	start := time.Now()
+	err = s.inner.CreateCheckResult(result)
+	observeStorage("create", "check_result", start, err)
+	return
+}
+
+func (s *instrumentedStorage) DeleteCheckResult(checkName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, resultId happydns.Identifier) (err error) {
+	start := time.Now()
+	err = s.inner.DeleteCheckResult(checkName, targetType, targetId, resultId)
+	observeStorage("delete", "check_result", start, err)
+	return
+}
+
+func (s *instrumentedStorage) DeleteOldCheckResults(checkName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, keepCount int) (err error) {
+	start := time.Now()
+	err = s.inner.DeleteOldCheckResults(checkName, targetType, targetId, keepCount)
+	observeStorage("delete", "check_result", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ListEnabledCheckerSchedules() (ret []*happydns.CheckerSchedule, err error) {
+	start := time.Now()
+	ret, err = s.inner.ListEnabledCheckerSchedules()
+	observeStorage("list", "check_schedule", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ListCheckerSchedulesByUser(userId happydns.Identifier) (ret []*happydns.CheckerSchedule, err error) {
+	start := time.Now()
+	ret, err = s.inner.ListCheckerSchedulesByUser(userId)
+	observeStorage("list", "check_schedule", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ListCheckerSchedulesByTarget(targetType happydns.CheckScopeType, targetId happydns.Identifier, insideType *happydns.CheckScopeType, insideId *happydns.Identifier) (ret []*happydns.CheckerSchedule, err error) {
+	start := time.Now()
+	ret, err = s.inner.ListCheckerSchedulesByTarget(targetType, targetId, insideType, insideId)
+	observeStorage("list", "check_schedule", start, err)
+	return
+}
+
+func (s *instrumentedStorage) GetCheckerSchedule(scheduleId happydns.Identifier) (ret *happydns.CheckerSchedule, err error) {
+	start := time.Now()
+	ret, err = s.inner.GetCheckerSchedule(scheduleId)
+	observeStorage("get", "check_schedule", start, err)
+	return
+}
+
+func (s *instrumentedStorage) CreateCheckerSchedule(schedule *happydns.CheckerSchedule) (err error) {
+	start := time.Now()
+	err = s.inner.CreateCheckerSchedule(schedule)
+	observeStorage("create", "check_schedule", start, err)
+	return
+}
+
+func (s *instrumentedStorage) UpdateCheckerSchedule(schedule *happydns.CheckerSchedule) (err error) {
+	start := time.Now()
+	err = s.inner.UpdateCheckerSchedule(schedule)
+	observeStorage("update", "check_schedule", start, err)
+	return
+}
+
+func (s *instrumentedStorage) DeleteCheckerSchedule(scheduleId happydns.Identifier) (err error) {
+	start := time.Now()
+	err = s.inner.DeleteCheckerSchedule(scheduleId)
+	observeStorage("delete", "check_schedule", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ListActiveCheckExecutions() (ret []*happydns.CheckExecution, err error) {
+	start := time.Now()
+	ret, err = s.inner.ListActiveCheckExecutions()
+	observeStorage("list", "check_execution", start, err)
+	return
+}
+
+func (s *instrumentedStorage) GetCheckExecution(executionId happydns.Identifier) (ret *happydns.CheckExecution, err error) {
+	start := time.Now()
+	ret, err = s.inner.GetCheckExecution(executionId)
+	observeStorage("get", "check_execution", start, err)
+	return
+}
+
+func (s *instrumentedStorage) CreateCheckExecution(execution *happydns.CheckExecution) (err error) {
+	start := time.Now()
+	err = s.inner.CreateCheckExecution(execution)
+	observeStorage("create", "check_execution", start, err)
+	return
+}
+
+func (s *instrumentedStorage) UpdateCheckExecution(execution *happydns.CheckExecution) (err error) {
+	start := time.Now()
+	err = s.inner.UpdateCheckExecution(execution)
+	observeStorage("update", "check_execution", start, err)
+	return
+}
+
+func (s *instrumentedStorage) DeleteCheckExecution(executionId happydns.Identifier) (err error) {
+	start := time.Now()
+	err = s.inner.DeleteCheckExecution(executionId)
+	observeStorage("delete", "check_execution", start, err)
+	return
+}
+
+func (s *instrumentedStorage) CheckSchedulerRun() (err error) {
+	start := time.Now()
+	err = s.inner.CheckSchedulerRun()
+	observeStorage("run", "check_schedule", start, err)
+	return
+}
+
+func (s *instrumentedStorage) LastCheckSchedulerRun() (t *time.Time, err error) {
+	start := time.Now()
+	t, err = s.inner.LastCheckSchedulerRun()
+	observeStorage("get", "check_schedule", start, err)
+	return
+}
+
+// CheckerConfiguration
+
+func (s *instrumentedStorage) ListAllCheckerConfigurations() (ret happydns.Iterator[happydns.CheckerOptions], err error) {
+	start := time.Now()
+	ret, err = s.inner.ListAllCheckerConfigurations()
+	observeStorage("list", "check_config", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ListCheckerConfiguration(name string) (ret []*happydns.CheckerOptionsPositional, err error) {
+	start := time.Now()
+	ret, err = s.inner.ListCheckerConfiguration(name)
+	observeStorage("list", "check_config", start, err)
+	return
+}
+
+func (s *instrumentedStorage) GetCheckerConfiguration(name string, a *happydns.Identifier, b *happydns.Identifier, c *happydns.Identifier) (ret []*happydns.CheckerOptionsPositional, err error) {
+	start := time.Now()
+	ret, err = s.inner.GetCheckerConfiguration(name, a, b, c)
+	observeStorage("get", "check_config", start, err)
+	return
+}
+
+func (s *instrumentedStorage) UpdateCheckerConfiguration(name string, a *happydns.Identifier, b *happydns.Identifier, c *happydns.Identifier, opts happydns.CheckerOptions) (err error) {
+	start := time.Now()
+	err = s.inner.UpdateCheckerConfiguration(name, a, b, c, opts)
+	observeStorage("update", "check_config", start, err)
+	return
+}
+
+func (s *instrumentedStorage) DeleteCheckerConfiguration(name string, a *happydns.Identifier, b *happydns.Identifier, c *happydns.Identifier) (err error) {
+	start := time.Now()
+	err = s.inner.DeleteCheckerConfiguration(name, a, b, c)
+	observeStorage("delete", "check_config", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ClearCheckerConfigurations() (err error) {
+	start := time.Now()
+	err = s.inner.ClearCheckerConfigurations()
+	observeStorage("delete", "check_config", start, err)
+	return
+}
+
+// User
+
+func (s *instrumentedStorage) ListAllUsers() (ret happydns.Iterator[happydns.User], err error) {
+	start := time.Now()
+	ret, err = s.inner.ListAllUsers()
+	observeStorage("list", "user", start, err)
+	return
+}
+
+func (s *instrumentedStorage) GetUser(userid happydns.Identifier) (ret *happydns.User, err error) {
+	start := time.Now()
+	ret, err = s.inner.GetUser(userid)
+	observeStorage("get", "user", start, err)
+	return
+}
+
+func (s *instrumentedStorage) GetUserByEmail(email string) (ret *happydns.User, err error) {
+	start := time.Now()
+	ret, err = s.inner.GetUserByEmail(email)
+	observeStorage("get", "user", start, err)
+	return
+}
+
+func (s *instrumentedStorage) CreateOrUpdateUser(user *happydns.User) (err error) {
+	start := time.Now()
+	err = s.inner.CreateOrUpdateUser(user)
+	observeStorage("update", "user", start, err)
+	return
+}
+
+func (s *instrumentedStorage) DeleteUser(userid happydns.Identifier) (err error) {
+	start := time.Now()
+	err = s.inner.DeleteUser(userid)
+	observeStorage("delete", "user", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ClearUsers() (err error) {
+	start := time.Now()
+	err = s.inner.ClearUsers()
+	observeStorage("delete", "user", start, err)
+	return
+}
+
+// Zone
+
+func (s *instrumentedStorage) ListAllZones() (ret happydns.Iterator[happydns.ZoneMessage], err error) {
+	start := time.Now()
+	ret, err = s.inner.ListAllZones()
+	observeStorage("list", "zone", start, err)
+	return
+}
+
+func (s *instrumentedStorage) GetZoneMeta(zoneid happydns.Identifier) (ret *happydns.ZoneMeta, err error) {
+	start := time.Now()
+	ret, err = s.inner.GetZoneMeta(zoneid)
+	observeStorage("get", "zone", start, err)
+	return
+}
+
+func (s *instrumentedStorage) GetZone(zoneid happydns.Identifier) (ret *happydns.ZoneMessage, err error) {
+	start := time.Now()
+	ret, err = s.inner.GetZone(zoneid)
+	observeStorage("get", "zone", start, err)
+	return
+}
+
+func (s *instrumentedStorage) CreateZone(zone *happydns.Zone) (err error) {
+	start := time.Now()
+	err = s.inner.CreateZone(zone)
+	observeStorage("create", "zone", start, err)
+	return
+}
+
+func (s *instrumentedStorage) UpdateZone(zone *happydns.Zone) (err error) {
+	start := time.Now()
+	err = s.inner.UpdateZone(zone)
+	observeStorage("update", "zone", start, err)
+	return
+}
+
+func (s *instrumentedStorage) DeleteZone(zoneid happydns.Identifier) (err error) {
+	start := time.Now()
+	err = s.inner.DeleteZone(zoneid)
+	observeStorage("delete", "zone", start, err)
+	return
+}
+
+func (s *instrumentedStorage) ClearZones() (err error) {
+	start := time.Now()
+	err = s.inner.ClearZones()
+	observeStorage("delete", "zone", start, err)
+	return
+}

internal/app/plugins.go

@@ -0,0 +1,134 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package app
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"plugin"
+
+	"git.happydns.org/happyDomain/checks"
+	"git.happydns.org/happyDomain/model"
+)
+
+// pluginLoader attempts to find and register one specific kind of plugin
+// symbol from an already-opened .so file.
+//
+// It returns (true, nil) when the symbol was found and registration
+// succeeded, (true, err) when the symbol was found but something went wrong,
+// and (false, nil) when the symbol simply isn't present in that file (which
+// is not considered an error — a single .so may implement only a subset of
+// the known plugin types).
+type pluginLoader func(p *plugin.Plugin, fname string) (found bool, err error)
+
+// pluginLoaders is the authoritative list of plugin types that happyDomain
+// knows about. To support a new plugin type, add a single entry here.
+var pluginLoaders = []pluginLoader{
+	loadCheckPlugin,
+}
+
+// loadCheckPlugin handles the NewTestPlugin symbol.
+func loadCheckPlugin(p *plugin.Plugin, fname string) (bool, error) {
+	sym, err := p.Lookup("NewCheckPlugin")
+	if err != nil {
+		// Symbol not present in this .so — not an error.
+		return false, nil
+	}
+
+	factory, ok := sym.(func() (string, happydns.Checker, error))
+	if !ok {
+		return true, fmt.Errorf("symbol NewCheckPlugin has unexpected type %T", sym)
+	}
+
+	pluginname, myplugin, err := factory()
+	if err != nil {
+		return true, err
+	}
+
+	checks.RegisterChecker(pluginname, myplugin)
+	log.Printf("Plugin %s loaded", pluginname)
+	return true, nil
+}
+
+// initPlugins scans each directory listed in cfg.PluginsDirectories, loads
+// every .so file found as a Go plugin, and registers it in the application's
+// PluginManager. All load errors are collected and returned as a joined error
+// so that a single bad plugin does not prevent the others from loading.
+func (a *App) initPlugins() error {
+	for _, directory := range a.cfg.PluginsDirectories {
+		files, err := os.ReadDir(directory)
+		if err != nil {
+			return fmt.Errorf("unable to read plugins directory %q: %s", directory, err)
+		}
+
+		for _, file := range files {
+			if file.IsDir() {
+				continue
+			}
+
+			// Only attempt to load shared-object files.
+			if filepath.Ext(file.Name()) != ".so" {
+				continue
+			}
+
+			fname := filepath.Join(directory, file.Name())
+
+			err = loadPlugin(fname)
+			if err != nil {
+				log.Printf("Unable to load plugin %q: %s", fname, err)
+			}
+		}
+	}
+
+	return nil
+}
+
+// loadPlugin opens the .so file at fname and runs every registered
+// pluginLoader against it. A loader that does not find its symbol is silently
+// skipped. If no loader recognises any symbol in the file a warning is logged,
+// but no error is returned because the file might be a valid plugin for a
+// future version of happyDomain. The first loader error that is encountered
+// is returned immediately.
+func loadPlugin(fname string) error {
+	p, err := plugin.Open(fname)
+	if err != nil {
+		return err
+	}
+
+	anyFound := false
+	for _, loader := range pluginLoaders {
+		found, err := loader(p, fname)
+		if err != nil {
+			return err
+		}
+		if found {
+			anyFound = true
+		}
+	}
+
+	if !anyFound {
+		log.Printf("Warning: plugin %q exports no recognised symbols", fname)
+	}
+	return nil
+}

internal/config/cli.go

@@ -60,6 +60,8 @@ func declareFlags(o *happydns.Options) {
 	flag.StringVar(&o.CaptchaProvider, "captcha-provider", o.CaptchaProvider, "Captcha provider to use for bot protection (altcha, hcaptcha, recaptchav2, turnstile, or empty to disable)")
 	flag.IntVar(&o.CaptchaLoginThreshold, "captcha-login-threshold", 3, "Number of failed login attempts before captcha is required (0 = always require when provider configured)")
 
+	flag.Var(&ArrayArgs{&o.PluginsDirectories}, "plugins-directory", "Path to a directory containing plugins (can be repeated multiple times)")
+
 	// Others flags are declared in some other files likes sources, storages, ... when they need specials configurations
 }
 

internal/config/config.go

@@ -44,15 +44,18 @@ func ConsolidateConfig() (opts *happydns.Options, err error) {
 
 	// Define defaults options
 	opts = &happydns.Options{
-		AdminBind:         "./happydomain.sock",
+		AdminBind:           "./happydomain.sock",
-		BasePath:          "/",
+		BasePath:            "/",
-		Bind:              ":8081",
+		Bind:                ":8081",
-		DefaultNameServer: "127.0.0.1:53",
+		DefaultNameServer:   "127.0.0.1:53",
-		ExternalURL:       *u,
+		ExternalURL:         *u,
-		JWTSigningMethod:  "HS512",
+		JWTSigningMethod:    "HS512",
-		MailFrom:          mail.Address{Name: "happyDomain", Address: "happydomain@localhost"},
+		MailFrom:            mail.Address{Name: "happyDomain", Address: "happydomain@localhost"},
-		MailSMTPPort:      587,
+		MailSMTPPort:        587,
-		StorageEngine:     "leveldb",
+		StorageEngine:       "leveldb",
+		MaxResultsPerCheck:  100,
+		ResultRetentionDays: 90,
+		TestWorkers:         2,
 	}
 
 	declareFlags(opts)

internal/config/custom.go

@@ -25,8 +25,25 @@ import (
 	"encoding/base64"
 	"net/mail"
 	"net/url"
+	"strings"
 )
 
+type ArrayArgs struct {
+	Slice *[]string
+}
+
+func (i *ArrayArgs) String() string {
+	if i == nil || i.Slice == nil {
+		return ""
+	}
+	return strings.Join(*i.Slice, ",")
+}
+
+func (i *ArrayArgs) Set(value string) error {
+	*i.Slice = append(*i.Slice, value)
+	return nil
+}
+
 type JWTSecretKey struct {
 	Secret *[]byte
 }

internal/metrics/collector.go

@@ -0,0 +1,101 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package metrics
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// StatsProvider is the minimal interface required by StorageStatsCollector to
+// count business entities. It is implemented by internal/app.storageStatsProvider.
+type StatsProvider interface {
+	CountUsers() (int, error)
+	CountDomains() (int, error)
+	CountZones() (int, error)
+	CountProviders() (int, error)
+}
+
+// StorageStatsCollector is a Prometheus Collector that queries storage at each
+// scrape to report accurate business-entity counts.
+type StorageStatsCollector struct {
+	provider StatsProvider
+
+	usersDesc     *prometheus.Desc
+	domainsDesc   *prometheus.Desc
+	zonesDesc     *prometheus.Desc
+	providersDesc *prometheus.Desc
+}
+
+// NewStorageStatsCollector creates a new collector backed by the given StatsProvider
+// and registers it with the default Prometheus registry.
+func NewStorageStatsCollector(p StatsProvider) *StorageStatsCollector {
+	c := &StorageStatsCollector{
+		provider: p,
+		usersDesc: prometheus.NewDesc(
+			"happydomain_registered_users_total",
+			"Current number of registered user accounts.",
+			nil, nil,
+		),
+		domainsDesc: prometheus.NewDesc(
+			"happydomain_domains_total",
+			"Current number of domains managed across all users.",
+			nil, nil,
+		),
+		zonesDesc: prometheus.NewDesc(
+			"happydomain_zones_total",
+			"Current number of zone snapshots stored.",
+			nil, nil,
+		),
+		providersDesc: prometheus.NewDesc(
+			"happydomain_providers_total",
+			"Current number of provider configurations across all users.",
+			nil, nil,
+		),
+	}
+	prometheus.MustRegister(c)
+	return c
+}
+
+// Describe implements prometheus.Collector.
+func (c *StorageStatsCollector) Describe(ch chan<- *prometheus.Desc) {
+	ch <- c.usersDesc
+	ch <- c.domainsDesc
+	ch <- c.zonesDesc
+	ch <- c.providersDesc
+}
+
+// Collect implements prometheus.Collector. It queries storage live so the
+// values always reflect the actual database state.
+func (c *StorageStatsCollector) Collect(ch chan<- prometheus.Metric) {
+	if n, err := c.provider.CountUsers(); err == nil {
+		ch <- prometheus.MustNewConstMetric(c.usersDesc, prometheus.GaugeValue, float64(n))
+	}
+	if n, err := c.provider.CountDomains(); err == nil {
+		ch <- prometheus.MustNewConstMetric(c.domainsDesc, prometheus.GaugeValue, float64(n))
+	}
+	if n, err := c.provider.CountZones(); err == nil {
+		ch <- prometheus.MustNewConstMetric(c.zonesDesc, prometheus.GaugeValue, float64(n))
+	}
+	if n, err := c.provider.CountProviders(); err == nil {
+		ch <- prometheus.MustNewConstMetric(c.providersDesc, prometheus.GaugeValue, float64(n))
+	}
+}

internal/metrics/http.go

@@ -0,0 +1,54 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package metrics
+
+import (
+	"strconv"
+	"time"
+
+	"github.com/gin-gonic/gin"
+)
+
+// HTTPMiddleware returns a Gin middleware that records HTTP request metrics.
+// It uses c.FullPath() to get the route pattern (e.g. /api/domains/:domain)
+// rather than the actual URL, avoiding high-cardinality labels.
+func HTTPMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		start := time.Now()
+		HTTPRequestsInFlight.Inc()
+
+		c.Next()
+
+		HTTPRequestsInFlight.Dec()
+
+		path := c.FullPath()
+		if path == "" {
+			path = "unknown"
+		}
+		method := c.Request.Method
+		status := strconv.Itoa(c.Writer.Status())
+		duration := time.Since(start).Seconds()
+
+		HTTPRequestsTotal.WithLabelValues(method, path, status).Inc()
+		HTTPRequestDuration.WithLabelValues(method, path).Observe(duration)
+	}
+}

internal/metrics/metrics.go

@@ -0,0 +1,104 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package metrics
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+)
+
+var (
+	// HTTP metrics
+	HTTPRequestsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
+		Name: "happydomain_http_requests_total",
+		Help: "Total number of HTTP requests.",
+	}, []string{"method", "path", "status"})
+
+	HTTPRequestDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
+		Name:    "happydomain_http_request_duration_seconds",
+		Help:    "Duration of HTTP requests in seconds.",
+		Buckets: prometheus.DefBuckets,
+	}, []string{"method", "path"})
+
+	HTTPRequestsInFlight = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "happydomain_http_requests_in_flight",
+		Help: "Current number of HTTP requests being served.",
+	})
+
+	// Scheduler metrics
+	SchedulerQueueDepth = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "happydomain_scheduler_queue_depth",
+		Help: "Number of items currently in the check scheduler queue.",
+	})
+
+	SchedulerActiveWorkers = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "happydomain_scheduler_active_workers",
+		Help: "Number of check scheduler workers currently executing a check.",
+	})
+
+	SchedulerChecksTotal = promauto.NewCounterVec(prometheus.CounterOpts{
+		Name: "happydomain_scheduler_checks_total",
+		Help: "Total number of checks executed by the scheduler.",
+	}, []string{"checker", "status"})
+
+	SchedulerCheckDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
+		Name:    "happydomain_scheduler_check_duration_seconds",
+		Help:    "Duration of individual check executions in seconds.",
+		Buckets: prometheus.DefBuckets,
+	}, []string{"checker"})
+
+	// DNS provider API metrics
+	ProviderAPICallsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
+		Name: "happydomain_provider_api_calls_total",
+		Help: "Total number of DNS provider API calls.",
+	}, []string{"provider", "operation", "status"})
+
+	ProviderAPIDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
+		Name:    "happydomain_provider_api_duration_seconds",
+		Help:    "Duration of DNS provider API calls in seconds.",
+		Buckets: prometheus.DefBuckets,
+	}, []string{"provider", "operation"})
+
+	// Storage metrics
+	StorageOperationsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
+		Name: "happydomain_storage_operations_total",
+		Help: "Total number of storage operations.",
+	}, []string{"operation", "entity", "status"})
+
+	StorageOperationDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
+		Name:    "happydomain_storage_operation_duration_seconds",
+		Help:    "Duration of storage operations in seconds.",
+		Buckets: prometheus.DefBuckets,
+	}, []string{"operation", "entity"})
+
+	// Build info
+	BuildInfo = promauto.NewGaugeVec(prometheus.GaugeOpts{
+		Name: "happydomain_build_info",
+		Help: "Build information about the running happyDomain instance.",
+	}, []string{"version"})
+)
+
+// SetBuildInfo records the application version in the build info metric.
+// Call this once during application startup.
+func SetBuildInfo(version string) {
+	BuildInfo.WithLabelValues(version).Set(1)
+}

internal/storage/inmemory/database.go

@@ -40,6 +40,7 @@ type InMemoryStorage struct {
 	data                map[string][]byte // Generic key-value store for KVStorage interface
 	authUsers           map[string]*happydns.UserAuth
 	authUsersByEmail    map[string]happydns.Identifier
+	checksCfg           map[string]*happydns.CheckerOptions
 	domains             map[string]*happydns.Domain
 	domainLogs          map[string]*happydns.DomainLogWithDomainId
 	domainLogsByDomains map[string][]*happydns.Identifier
@@ -58,6 +59,7 @@ func NewInMemoryStorage() (*InMemoryStorage, error) {
 		data:                make(map[string][]byte),
 		authUsers:           make(map[string]*happydns.UserAuth),
 		authUsersByEmail:    make(map[string]happydns.Identifier),
+		checksCfg:           make(map[string]*happydns.CheckerOptions),
 		domains:             make(map[string]*happydns.Domain),
 		domainLogs:          make(map[string]*happydns.DomainLogWithDomainId),
 		domainLogsByDomains: make(map[string][]*happydns.Identifier),

internal/storage/interface.go

@@ -23,6 +23,8 @@ package storage // import "git.happydns.org/happyDomain/internal/storage"
 
 import (
 	"git.happydns.org/happyDomain/internal/usecase/authuser"
+	"git.happydns.org/happyDomain/internal/usecase/check"
+	"git.happydns.org/happyDomain/internal/usecase/checkresult"
 	"git.happydns.org/happyDomain/internal/usecase/domain"
 	"git.happydns.org/happyDomain/internal/usecase/domain_log"
 	"git.happydns.org/happyDomain/internal/usecase/insight"
@@ -43,8 +45,10 @@ type Storage interface {
 	domain.DomainStorage
 	domainlog.DomainLogStorage
 	insight.InsightStorage
+	check.CheckerStorage
 	provider.ProviderStorage
 	session.SessionStorage
+	checkresult.CheckResultStorage
 	user.UserStorage
 	zone.ZoneStorage
 

internal/storage/kvtpl/check.go

@@ -0,0 +1,185 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2025 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package database
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+
+	"git.happydns.org/happyDomain/model"
+)
+
+func (s *KVStorage) ListAllCheckerConfigurations() (happydns.Iterator[happydns.CheckerOptions], error) {
+	iter := s.db.Search("chckrcfg-")
+	return NewKVIterator[happydns.CheckerOptions](s.db, iter), nil
+}
+
+func buildCheckerKey(cname string, user *happydns.Identifier, domain *happydns.Identifier, service *happydns.Identifier) string {
+	u := ""
+	if user != nil {
+		u = user.String()
+	}
+
+	d := ""
+	if domain != nil {
+		d = domain.String()
+	}
+
+	s := ""
+	if service != nil {
+		s = service.String()
+	}
+
+	return strings.Join([]string{cname, u, d, s}, "/")
+}
+
+func keyToPositional(key string, opts *happydns.CheckerOptions) (*happydns.CheckerOptionsPositional, error) {
+	tmp := strings.Split(key, "/")
+
+	if len(tmp) < 4 {
+		return nil, fmt.Errorf("malformed plugin configuration key, got %q", key)
+	}
+
+	cname := tmp[0]
+
+	var userid *happydns.Identifier
+	if len(tmp[1]) > 0 {
+		u, err := happydns.NewIdentifierFromString(tmp[1])
+		if err != nil {
+			return nil, err
+		}
+		userid = &u
+	}
+
+	var domainid *happydns.Identifier
+	if len(tmp[2]) > 0 {
+		d, err := happydns.NewIdentifierFromString(tmp[2])
+		if err != nil {
+			return nil, err
+		}
+		domainid = &d
+	}
+
+	var serviceid *happydns.Identifier
+	if len(tmp[3]) > 0 {
+		s, err := happydns.NewIdentifierFromString(tmp[3])
+		if err != nil {
+			return nil, err
+		}
+		serviceid = &s
+	}
+
+	return &happydns.CheckerOptionsPositional{
+		CheckName: cname,
+		UserId:    userid,
+		DomainId:  domainid,
+		ServiceId: serviceid,
+		Options:   *opts,
+	}, nil
+}
+
+func (s *KVStorage) ListCheckerConfiguration(cname string) (configs []*happydns.CheckerOptionsPositional, err error) {
+	iter := s.db.Search("chckrcfg-" + cname + "/")
+	defer iter.Release()
+
+	for iter.Next() {
+		var p happydns.CheckerOptions
+
+		e := s.db.DecodeData(iter.Value(), &p)
+		if e != nil {
+			err = errors.Join(err, e)
+			continue
+		}
+
+		opts, e := keyToPositional(strings.TrimPrefix(iter.Key(), "chckrcfg-"), &p)
+		if e != nil {
+			err = errors.Join(err, e)
+			continue
+		}
+
+		configs = append(configs, opts)
+	}
+
+	return
+}
+
+func (s *KVStorage) GetCheckerConfiguration(cname string, user *happydns.Identifier, domain *happydns.Identifier, service *happydns.Identifier) (configs []*happydns.CheckerOptionsPositional, err error) {
+	iter := s.db.Search("chckrcfg-" + cname + "/")
+	defer iter.Release()
+
+	for iter.Next() {
+		var p happydns.CheckerOptions
+
+		e := s.db.DecodeData(iter.Value(), &p)
+		if e != nil {
+			err = errors.Join(err, e)
+			continue
+		}
+
+		opts, e := keyToPositional(strings.TrimPrefix(iter.Key(), "chckrcfg-"), &p)
+		if e != nil {
+			err = errors.Join(err, e)
+			continue
+		}
+
+		// Match logic:
+		// - When parameter is nil: match ONLY configs with nil ID (requesting specific scope)
+		// - When parameter is not nil: match configs with nil ID (admin-level) OR matching ID
+		matchUser := (user == nil && opts.UserId == nil) ||
+			(user != nil && (opts.UserId == nil || opts.UserId.Equals(*user)))
+
+		matchDomain := (domain == nil && opts.DomainId == nil) ||
+			(domain != nil && (opts.DomainId == nil || opts.DomainId.Equals(*domain)))
+
+		matchService := (service == nil && opts.ServiceId == nil) ||
+			(service != nil && (opts.ServiceId == nil || opts.ServiceId.Equals(*service)))
+
+		if matchUser && matchDomain && matchService {
+			configs = append(configs, opts)
+		}
+	}
+
+	return
+}
+
+func (s *KVStorage) UpdateCheckerConfiguration(cname string, user *happydns.Identifier, domain *happydns.Identifier, service *happydns.Identifier, opts happydns.CheckerOptions) error {
+	return s.db.Put(fmt.Sprintf("chckrcfg-%s", buildCheckerKey(cname, user, domain, service)), opts)
+}
+
+func (s *KVStorage) DeleteCheckerConfiguration(cname string, user *happydns.Identifier, domain *happydns.Identifier, service *happydns.Identifier) error {
+	return s.db.Delete(fmt.Sprintf("chckrcfg-%s", buildCheckerKey(cname, user, domain, service)))
+}
+
+func (s *KVStorage) ClearCheckerConfigurations() error {
+	iter := s.db.Search("chckrcfg-")
+	defer iter.Release()
+
+	for iter.Next() {
+		err := s.db.Delete(iter.Key())
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

internal/storage/kvtpl/checkresult.go

@@ -0,0 +1,453 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package database
+
+import (
+	"errors"
+	"fmt"
+	"sort"
+	"strings"
+	"time"
+
+	"git.happydns.org/happyDomain/model"
+)
+
+// Check Result storage keys:
+// checkresult|{plugin-name}|{target-type}|{target-id}|{result-id}
+func makeCheckResultKey(checkName string, targetType happydns.CheckScopeType, targetId, resultId happydns.Identifier) string {
+	return fmt.Sprintf("checkresult|%s|%d|%s|%s", checkName, targetType, targetId.String(), resultId.String())
+}
+
+func makeCheckResultPrefix(checkName string, targetType happydns.CheckScopeType, targetId happydns.Identifier) string {
+	return fmt.Sprintf("checkresult|%s|%d|%s|", checkName, targetType, targetId.String())
+}
+
+// ListCheckResults retrieves check results for a specific plugin+target combination
+func (s *KVStorage) ListCheckResults(checkName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, limit int) ([]*happydns.CheckResult, error) {
+	prefix := makeCheckResultPrefix(checkName, targetType, targetId)
+	iter := s.db.Search(prefix)
+	defer iter.Release()
+
+	var results []*happydns.CheckResult
+	for iter.Next() {
+		var r happydns.CheckResult
+		if err := s.db.DecodeData(iter.Value(), &r); err != nil {
+			return nil, err
+		}
+		results = append(results, &r)
+	}
+
+	// Sort by ExecutedAt descending (most recent first)
+	sort.Slice(results, func(i, j int) bool {
+		return results[i].ExecutedAt.After(results[j].ExecutedAt)
+	})
+
+	// Apply limit
+	if limit > 0 && len(results) > limit {
+		results = results[:limit]
+	}
+
+	return results, nil
+}
+
+// ListCheckResultsByPlugin retrieves all check results for a plugin across all targets for a user
+func (s *KVStorage) ListCheckResultsByPlugin(userId happydns.Identifier, checkName string, limit int) ([]*happydns.CheckResult, error) {
+	prefix := fmt.Sprintf("checkresult|%s|", checkName)
+	iter := s.db.Search(prefix)
+	defer iter.Release()
+
+	var results []*happydns.CheckResult
+	for iter.Next() {
+		var r happydns.CheckResult
+		if err := s.db.DecodeData(iter.Value(), &r); err != nil {
+			return nil, err
+		}
+		// Filter by user
+		if r.OwnerId.Equals(userId) {
+			results = append(results, &r)
+		}
+	}
+
+	// Sort by ExecutedAt descending (most recent first)
+	sort.Slice(results, func(i, j int) bool {
+		return results[i].ExecutedAt.After(results[j].ExecutedAt)
+	})
+
+	// Apply limit
+	if limit > 0 && len(results) > limit {
+		results = results[:limit]
+	}
+
+	return results, nil
+}
+
+// ListCheckResultsByUser retrieves all check results for a user
+func (s *KVStorage) ListCheckResultsByUser(userId happydns.Identifier, limit int) ([]*happydns.CheckResult, error) {
+	iter := s.db.Search("checkresult|")
+	defer iter.Release()
+
+	var results []*happydns.CheckResult
+	for iter.Next() {
+		var r happydns.CheckResult
+		if err := s.db.DecodeData(iter.Value(), &r); err != nil {
+			return nil, err
+		}
+		// Filter by user
+		if r.OwnerId.Equals(userId) {
+			results = append(results, &r)
+		}
+	}
+
+	// Sort by ExecutedAt descending (most recent first)
+	sort.Slice(results, func(i, j int) bool {
+		return results[i].ExecutedAt.After(results[j].ExecutedAt)
+	})
+
+	// Apply limit
+	if limit > 0 && len(results) > limit {
+		results = results[:limit]
+	}
+
+	return results, nil
+}
+
+// GetCheckResult retrieves a specific check result by its ID
+func (s *KVStorage) GetCheckResult(checkName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, resultId happydns.Identifier) (*happydns.CheckResult, error) {
+	key := makeCheckResultKey(checkName, targetType, targetId, resultId)
+	var result happydns.CheckResult
+	err := s.db.Get(key, &result)
+	if errors.Is(err, happydns.ErrNotFound) {
+		return nil, happydns.ErrCheckResultNotFound
+	}
+	return &result, err
+}
+
+// CreateCheckResult stores a new check result
+func (s *KVStorage) CreateCheckResult(result *happydns.CheckResult) error {
+	prefix := makeCheckResultPrefix(result.CheckerName, result.CheckType, result.TargetId)
+	key, id, err := s.db.FindIdentifierKey(prefix)
+	if err != nil {
+		return err
+	}
+
+	result.Id = id
+	return s.db.Put(key, result)
+}
+
+// DeleteCheckResult removes a specific check result
+func (s *KVStorage) DeleteCheckResult(checkName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, resultId happydns.Identifier) error {
+	key := makeCheckResultKey(checkName, targetType, targetId, resultId)
+	return s.db.Delete(key)
+}
+
+// DeleteOldCheckResults removes old check results keeping only the most recent N results
+func (s *KVStorage) DeleteOldCheckResults(checkName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, keepCount int) error {
+	results, err := s.ListCheckResults(checkName, targetType, targetId, 0)
+	if err != nil {
+		return err
+	}
+
+	// Results are already sorted by ExecutedAt descending
+	// Delete results beyond keepCount
+	if len(results) > keepCount {
+		for _, r := range results[keepCount:] {
+			if err := s.DeleteCheckResult(checkName, targetType, targetId, r.Id); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+// Checker Schedule storage keys:
+// checkschedule|{schedule-id}
+// checkschedule.byuser|{user-id}|{schedule-id}
+// checkschedule.bytarget|{target-type}|{target-id}|{schedule-id}
+
+func makeCheckerScheduleKey(scheduleId happydns.Identifier) string {
+	return fmt.Sprintf("checkschedule|%s", scheduleId.String())
+}
+
+func makeCheckerScheduleUserIndexKey(userId, scheduleId happydns.Identifier) string {
+	return fmt.Sprintf("checkschedule.byuser|%s|%s", userId.String(), scheduleId.String())
+}
+
+func makeCheckerScheduleTargetIndexKey(targetType happydns.CheckScopeType, targetId, scheduleId happydns.Identifier) string {
+	return fmt.Sprintf("checkschedule.bytarget|%d|%s|%s", targetType, targetId.String(), scheduleId.String())
+}
+
+// ListEnabledCheckerSchedules retrieves all enabled schedules
+func (s *KVStorage) ListEnabledCheckerSchedules() ([]*happydns.CheckerSchedule, error) {
+	iter := s.db.Search("checkschedule|")
+	defer iter.Release()
+
+	var schedules []*happydns.CheckerSchedule
+	for iter.Next() {
+		var sched happydns.CheckerSchedule
+		if err := s.db.DecodeData(iter.Value(), &sched); err != nil {
+			return nil, err
+		}
+		if sched.Enabled {
+			schedules = append(schedules, &sched)
+		}
+	}
+
+	return schedules, nil
+}
+
+// ListCheckerSchedulesByUser retrieves all schedules for a specific user
+func (s *KVStorage) ListCheckerSchedulesByUser(userId happydns.Identifier) ([]*happydns.CheckerSchedule, error) {
+	prefix := fmt.Sprintf("checkschedule.byuser|%s|", userId.String())
+	iter := s.db.Search(prefix)
+	defer iter.Release()
+
+	var schedules []*happydns.CheckerSchedule
+	for iter.Next() {
+		// Extract schedule ID from index key
+		key := string(iter.Key())
+		parts := strings.Split(key, "|")
+		if len(parts) < 3 {
+			continue
+		}
+
+		scheduleId, err := happydns.NewIdentifierFromString(parts[2])
+		if err != nil {
+			continue
+		}
+
+		// Get the actual schedule
+		var sched happydns.CheckerSchedule
+		schedKey := makeCheckerScheduleKey(scheduleId)
+		if err := s.db.Get(schedKey, &sched); err != nil {
+			continue
+		}
+
+		schedules = append(schedules, &sched)
+	}
+
+	return schedules, nil
+}
+
+// ListCheckerSchedulesByTarget retrieves all schedules for a specific target
+func (s *KVStorage) ListCheckerSchedulesByTarget(targetType happydns.CheckScopeType, targetId happydns.Identifier, insideType *happydns.CheckScopeType, insideId *happydns.Identifier) ([]*happydns.CheckerSchedule, error) {
+	prefix := fmt.Sprintf("checkschedule.bytarget|%d|%s|", targetType, targetId.String())
+	iter := s.db.Search(prefix)
+	defer iter.Release()
+
+	var schedules []*happydns.CheckerSchedule
+	for iter.Next() {
+		// Extract schedule ID from index key
+		key := string(iter.Key())
+		parts := strings.Split(key, "|")
+		if len(parts) < 4 {
+			continue
+		}
+
+		scheduleId, err := happydns.NewIdentifierFromString(parts[3])
+		if err != nil {
+			continue
+		}
+
+		// Get the actual schedule
+		var sched happydns.CheckerSchedule
+		schedKey := makeCheckerScheduleKey(scheduleId)
+		if err := s.db.Get(schedKey, &sched); err != nil {
+			continue
+		}
+
+		// Post-filter by insideType/insideId
+		if insideType == nil {
+			if sched.InsideType != nil {
+				continue
+			}
+		} else {
+			if sched.InsideType == nil || *sched.InsideType != *insideType {
+				continue
+			}
+			if insideId == nil {
+				if sched.InsideId != nil {
+					continue
+				}
+			} else {
+				if sched.InsideId == nil || !sched.InsideId.Equals(*insideId) {
+					continue
+				}
+			}
+		}
+
+		schedules = append(schedules, &sched)
+	}
+
+	return schedules, nil
+}
+
+// GetCheckerSchedule retrieves a specific schedule by ID
+func (s *KVStorage) GetCheckerSchedule(scheduleId happydns.Identifier) (*happydns.CheckerSchedule, error) {
+	key := makeCheckerScheduleKey(scheduleId)
+	var schedule happydns.CheckerSchedule
+	err := s.db.Get(key, &schedule)
+	if errors.Is(err, happydns.ErrNotFound) {
+		return nil, happydns.ErrCheckScheduleNotFound
+	}
+	return &schedule, err
+}
+
+// CreateCheckerSchedule creates a new check schedule
+func (s *KVStorage) CreateCheckerSchedule(schedule *happydns.CheckerSchedule) error {
+	key, id, err := s.db.FindIdentifierKey("checkschedule|")
+	if err != nil {
+		return err
+	}
+
+	schedule.Id = id
+
+	// Store the schedule
+	if err := s.db.Put(key, schedule); err != nil {
+		return err
+	}
+
+	// Create indexes
+	userIndexKey := makeCheckerScheduleUserIndexKey(schedule.OwnerId, schedule.Id)
+	if err := s.db.Put(userIndexKey, []byte{}); err != nil {
+		return err
+	}
+
+	targetIndexKey := makeCheckerScheduleTargetIndexKey(schedule.TargetType, schedule.TargetId, schedule.Id)
+	if err := s.db.Put(targetIndexKey, []byte{}); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// UpdateCheckerSchedule updates an existing schedule
+func (s *KVStorage) UpdateCheckerSchedule(schedule *happydns.CheckerSchedule) error {
+	key := makeCheckerScheduleKey(schedule.Id)
+	return s.db.Put(key, schedule)
+}
+
+// DeleteCheckerSchedule removes a schedule and its indexes
+func (s *KVStorage) DeleteCheckerSchedule(scheduleId happydns.Identifier) error {
+	// Get the schedule first to know what indexes to delete
+	schedule, err := s.GetCheckerSchedule(scheduleId)
+	if err != nil {
+		return err
+	}
+
+	// Delete indexes
+	userIndexKey := makeCheckerScheduleUserIndexKey(schedule.OwnerId, schedule.Id)
+	if err := s.db.Delete(userIndexKey); err != nil {
+		return err
+	}
+
+	targetIndexKey := makeCheckerScheduleTargetIndexKey(schedule.TargetType, schedule.TargetId, schedule.Id)
+	if err := s.db.Delete(targetIndexKey); err != nil {
+		return err
+	}
+
+	// Delete the schedule itself
+	key := makeCheckerScheduleKey(scheduleId)
+	return s.db.Delete(key)
+}
+
+// Check Execution storage keys:
+// checkexec|{execution-id}
+
+func makeCheckExecutionKey(executionId happydns.Identifier) string {
+	return fmt.Sprintf("checkexec|%s", executionId.String())
+}
+
+// ListActiveCheckExecutions retrieves all executions that are pending or running
+func (s *KVStorage) ListActiveCheckExecutions() ([]*happydns.CheckExecution, error) {
+	iter := s.db.Search("checkexec|")
+	defer iter.Release()
+
+	var executions []*happydns.CheckExecution
+	for iter.Next() {
+		var exec happydns.CheckExecution
+		if err := s.db.DecodeData(iter.Value(), &exec); err != nil {
+			return nil, err
+		}
+		if exec.Status == happydns.CheckExecutionPending || exec.Status == happydns.CheckExecutionRunning {
+			executions = append(executions, &exec)
+		}
+	}
+
+	return executions, nil
+}
+
+// GetCheckExecution retrieves a specific execution by ID
+func (s *KVStorage) GetCheckExecution(executionId happydns.Identifier) (*happydns.CheckExecution, error) {
+	key := makeCheckExecutionKey(executionId)
+	var execution happydns.CheckExecution
+	err := s.db.Get(key, &execution)
+	if errors.Is(err, happydns.ErrNotFound) {
+		return nil, happydns.ErrCheckExecutionNotFound
+	}
+	return &execution, err
+}
+
+// CreateCheckExecution creates a new check execution record
+func (s *KVStorage) CreateCheckExecution(execution *happydns.CheckExecution) error {
+	key, id, err := s.db.FindIdentifierKey("checkexec|")
+	if err != nil {
+		return err
+	}
+
+	execution.Id = id
+	return s.db.Put(key, execution)
+}
+
+// UpdateCheckExecution updates an existing execution record
+func (s *KVStorage) UpdateCheckExecution(execution *happydns.CheckExecution) error {
+	key := makeCheckExecutionKey(execution.Id)
+	return s.db.Put(key, execution)
+}
+
+// DeleteCheckExecution removes an execution record
+func (s *KVStorage) DeleteCheckExecution(executionId happydns.Identifier) error {
+	key := makeCheckExecutionKey(executionId)
+	return s.db.Delete(key)
+}
+
+// Scheduler state storage key:
+// checkscheduler.lastrun
+
+// CheckerSchedulerRun marks that the scheduler has run at current time
+func (s *KVStorage) CheckSchedulerRun() error {
+	now := time.Now()
+	return s.db.Put("checkscheduler.lastrun", &now)
+}
+
+// LastCheckSchedulerRun retrieves the last time the scheduler ran
+func (s *KVStorage) LastCheckSchedulerRun() (*time.Time, error) {
+	var lastRun time.Time
+	err := s.db.Get("checkscheduler.lastrun", &lastRun)
+	if errors.Is(err, happydns.ErrNotFound) {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &lastRun, nil
+}

internal/storage/stats_provider.go

@@ -0,0 +1,84 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package storage
+
+// StatsProvider implements metrics.StatsProvider using a Storage.
+type StatsProvider struct {
+	store Storage
+}
+
+// NewStatsProvider creates a StatsProvider backed by the given Storage.
+func NewStatsProvider(s Storage) *StatsProvider {
+	return &StatsProvider{store: s}
+}
+
+func (p *StatsProvider) CountUsers() (int, error) {
+	it, err := p.store.ListAllUsers()
+	if err != nil {
+		return 0, err
+	}
+	n := 0
+	for it.Next() {
+		n++
+	}
+	it.Close()
+	return n, nil
+}
+
+func (p *StatsProvider) CountDomains() (int, error) {
+	it, err := p.store.ListAllDomains()
+	if err != nil {
+		return 0, err
+	}
+	n := 0
+	for it.Next() {
+		n++
+	}
+	it.Close()
+	return n, nil
+}
+
+func (p *StatsProvider) CountZones() (int, error) {
+	it, err := p.store.ListAllZones()
+	if err != nil {
+		return 0, err
+	}
+	n := 0
+	for it.Next() {
+		n++
+	}
+	it.Close()
+	return n, nil
+}
+
+func (p *StatsProvider) CountProviders() (int, error) {
+	it, err := p.store.ListAllProviders()
+	if err != nil {
+		return 0, err
+	}
+	n := 0
+	for it.Next() {
+		n++
+	}
+	it.Close()
+	return n, nil
+}

internal/usecase/check/check_options_test.go

@@ -0,0 +1,450 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package check_test
+
+import (
+	"context"
+	"testing"
+
+	"git.happydns.org/happyDomain/checks"
+	"git.happydns.org/happyDomain/internal/storage"
+	"git.happydns.org/happyDomain/internal/storage/inmemory"
+	kv "git.happydns.org/happyDomain/internal/storage/kvtpl"
+	uc "git.happydns.org/happyDomain/internal/usecase/check"
+	"git.happydns.org/happyDomain/model"
+)
+
+// ---------------------------------------------------------------------------
+// mockCheckerForOptions – registered once at package init.
+// ---------------------------------------------------------------------------
+
+const testCheckerName = "test-mock-checker-options"
+
+type mockCheckerForOptions struct{}
+
+func (m *mockCheckerForOptions) ID() string   { return testCheckerName }
+func (m *mockCheckerForOptions) Name() string { return testCheckerName }
+func (m *mockCheckerForOptions) Availability() happydns.CheckerAvailability {
+	return happydns.CheckerAvailability{ApplyToDomain: true}
+}
+func (m *mockCheckerForOptions) Options() happydns.CheckerOptionsDocumentation {
+	return happydns.CheckerOptionsDocumentation{
+		RunOpts: []happydns.CheckerOptionDocumentation{
+			{Id: "run-param", Default: "run-default"},
+		},
+		DomainOpts: []happydns.CheckerOptionDocumentation{
+			{Id: "domain-autofill", AutoFill: happydns.AutoFillDomainName},
+			{Id: "domain-param", Default: "domain-default"},
+		},
+		UserOpts: []happydns.CheckerOptionDocumentation{
+			{Id: "user-param"},
+		},
+		ServiceOpts: []happydns.CheckerOptionDocumentation{
+			{Id: "service-param"},
+		},
+	}
+}
+func (m *mockCheckerForOptions) RunCheck(_ context.Context, opts happydns.CheckerOptions, meta map[string]string) (*happydns.CheckResult, error) {
+	return nil, nil
+}
+
+func init() {
+	checks.RegisterChecker(testCheckerName, &mockCheckerForOptions{})
+}
+
+// ---------------------------------------------------------------------------
+// Helper: create a fresh in-memory database for each test.
+// ---------------------------------------------------------------------------
+
+func newOptionsTestDB(t *testing.T) storage.Storage {
+	t.Helper()
+	mem, err := inmemory.NewInMemoryStorage()
+	if err != nil {
+		t.Fatalf("failed to create in-memory storage: %v", err)
+	}
+	db, err := kv.NewKVDatabase(mem)
+	if err != nil {
+		t.Fatalf("failed to create KV database: %v", err)
+	}
+	return db
+}
+
+func newTestCheckerUsecase(db storage.Storage) happydns.CheckerUsecase {
+	return uc.NewCheckerUsecase(&happydns.Options{}, db, db)
+}
+
+// ---------------------------------------------------------------------------
+// GetStoredCheckerOptionsNoDefault tests
+// ---------------------------------------------------------------------------
+
+func Test_GetStoredOptions_EmptyStore(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	opts, err := checkerUC.GetStoredCheckerOptionsNoDefault(testCheckerName, nil, nil, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(opts) != 0 {
+		t.Errorf("expected empty options from empty store, got %v", opts)
+	}
+}
+
+func Test_GetStoredOptions_MergesStored(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	userId, _ := happydns.NewRandomIdentifier()
+	// Store user-level option.
+	if err := db.UpdateCheckerConfiguration(testCheckerName, &userId, nil, nil, happydns.CheckerOptions{"user-param": "val"}); err != nil {
+		t.Fatalf("failed to seed option: %v", err)
+	}
+
+	opts, err := checkerUC.GetStoredCheckerOptionsNoDefault(testCheckerName, &userId, nil, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if opts["user-param"] != "val" {
+		t.Errorf("expected user-param='val', got %v", opts["user-param"])
+	}
+}
+
+func Test_GetStoredOptions_AutoFillInjects(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	// Create a domain in the db.
+	domain := &happydns.Domain{
+		DomainName: "example.com.",
+	}
+	if err := db.CreateDomain(domain); err != nil {
+		t.Fatalf("failed to create domain: %v", err)
+	}
+
+	opts, err := checkerUC.GetStoredCheckerOptionsNoDefault(testCheckerName, nil, &domain.Id, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if opts["domain-autofill"] != "example.com." {
+		t.Errorf("expected domain-autofill='example.com.', got %v", opts["domain-autofill"])
+	}
+}
+
+func Test_GetStoredOptions_UnknownCheckerReturnsStored(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	// Store options for an unknown checker.
+	if err := db.UpdateCheckerConfiguration("unknown-checker", nil, nil, nil, happydns.CheckerOptions{"some-param": "some-value"}); err != nil {
+		t.Fatalf("failed to seed option: %v", err)
+	}
+
+	opts, err := checkerUC.GetStoredCheckerOptionsNoDefault("unknown-checker", nil, nil, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if opts["some-param"] != "some-value" {
+		t.Errorf("expected some-param='some-value', got %v", opts["some-param"])
+	}
+}
+
+// ---------------------------------------------------------------------------
+// BuildMergedCheckerOptions tests
+// ---------------------------------------------------------------------------
+
+func Test_BuildMerged_DefaultsFirst(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	merged, err := checkerUC.BuildMergedCheckerOptions(testCheckerName, nil, nil, nil, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if merged["run-param"] != "run-default" {
+		t.Errorf("expected run-param='run-default', got %v", merged["run-param"])
+	}
+	if merged["domain-param"] != "domain-default" {
+		t.Errorf("expected domain-param='domain-default', got %v", merged["domain-param"])
+	}
+}
+
+func Test_BuildMerged_StoredOverridesDefault(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	domainId, _ := happydns.NewRandomIdentifier()
+
+	// Store domain-level option that overrides the default.
+	if err := db.UpdateCheckerConfiguration(testCheckerName, nil, &domainId, nil, happydns.CheckerOptions{"domain-param": "custom"}); err != nil {
+		t.Fatalf("failed to seed option: %v", err)
+	}
+
+	merged, err := checkerUC.BuildMergedCheckerOptions(testCheckerName, nil, &domainId, nil, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if merged["domain-param"] != "custom" {
+		t.Errorf("expected domain-param='custom' (stored overrides default), got %v", merged["domain-param"])
+	}
+}
+
+func Test_BuildMerged_RunOptsOverrideStored(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	// Store an admin-level value for run-param.
+	if err := db.UpdateCheckerConfiguration(testCheckerName, nil, nil, nil, happydns.CheckerOptions{"run-param": "stored-value"}); err != nil {
+		t.Fatalf("failed to seed option: %v", err)
+	}
+
+	runOpts := happydns.CheckerOptions{"run-param": "runtime"}
+	merged, err := checkerUC.BuildMergedCheckerOptions(testCheckerName, nil, nil, nil, runOpts)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if merged["run-param"] != "runtime" {
+		t.Errorf("expected run-param='runtime' (runOpts wins), got %v", merged["run-param"])
+	}
+}
+
+func Test_BuildMerged_AutoFillWinsOverAll(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	// Create domain in db.
+	domain := &happydns.Domain{
+		DomainName: "example.com.",
+	}
+	if err := db.CreateDomain(domain); err != nil {
+		t.Fatalf("failed to create domain: %v", err)
+	}
+
+	// Both stored and runOpts attempt to set domain-autofill.
+	if err := db.UpdateCheckerConfiguration(testCheckerName, nil, nil, nil, happydns.CheckerOptions{"domain-autofill": "manual-value"}); err != nil {
+		t.Fatalf("failed to seed option: %v", err)
+	}
+	runOpts := happydns.CheckerOptions{"domain-autofill": "runtime-value"}
+
+	merged, err := checkerUC.BuildMergedCheckerOptions(testCheckerName, nil, &domain.Id, nil, runOpts)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	// Auto-fill always wins.
+	if merged["domain-autofill"] != "example.com." {
+		t.Errorf("expected domain-autofill='example.com.' (auto-fill wins), got %v", merged["domain-autofill"])
+	}
+}
+
+func Test_BuildMerged_NilAutoFillStoreSkips(t *testing.T) {
+	db := newOptionsTestDB(t)
+	// Pass nil as the CheckAutoFillStorage interface (not a typed nil).
+	checkerUC := uc.NewCheckerUsecase(&happydns.Options{}, db, nil)
+
+	domainId, _ := happydns.NewRandomIdentifier()
+
+	// Should not panic even when autoFillStore is nil.
+	merged, err := checkerUC.BuildMergedCheckerOptions(testCheckerName, nil, &domainId, nil, nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	// domain-autofill should NOT be set (no auto-fill storage available).
+	if _, ok := merged["domain-autofill"]; ok {
+		t.Errorf("expected domain-autofill to be absent when autoFillStore is nil, got %v", merged["domain-autofill"])
+	}
+}
+
+// ---------------------------------------------------------------------------
+// SetCheckerOptions tests
+// ---------------------------------------------------------------------------
+
+func Test_SetOptions_ServiceLevel(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	userId, _ := happydns.NewRandomIdentifier()
+	domainId, _ := happydns.NewRandomIdentifier()
+	serviceId, _ := happydns.NewRandomIdentifier()
+
+	opts := happydns.CheckerOptions{"service-param": "val"}
+	if err := checkerUC.SetCheckerOptions(testCheckerName, &userId, &domainId, &serviceId, opts); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	// Verify the configuration was stored at service scope.
+	configs, err := db.GetCheckerConfiguration(testCheckerName, &userId, &domainId, &serviceId)
+	if err != nil {
+		t.Fatalf("failed to retrieve config: %v", err)
+	}
+	// Find the service-level entry (UserId, DomainId, ServiceId all set).
+	found := false
+	for _, c := range configs {
+		if c.UserId != nil && c.DomainId != nil && c.ServiceId != nil {
+			found = true
+			break
+		}
+	}
+	if !found {
+		t.Error("expected a service-level configuration entry to be stored")
+	}
+}
+
+func Test_SetOptions_DomainLevel(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	userId, _ := happydns.NewRandomIdentifier()
+	domainId, _ := happydns.NewRandomIdentifier()
+
+	opts := happydns.CheckerOptions{"domain-param": "val"}
+	if err := checkerUC.SetCheckerOptions(testCheckerName, &userId, &domainId, nil, opts); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	configs, err := db.GetCheckerConfiguration(testCheckerName, &userId, &domainId, nil)
+	if err != nil {
+		t.Fatalf("failed to retrieve config: %v", err)
+	}
+	found := false
+	for _, c := range configs {
+		if c.UserId != nil && c.DomainId != nil && c.ServiceId == nil {
+			found = true
+			break
+		}
+	}
+	if !found {
+		t.Error("expected a domain-level configuration entry to be stored")
+	}
+}
+
+func Test_SetOptions_UserLevel(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	userId, _ := happydns.NewRandomIdentifier()
+
+	opts := happydns.CheckerOptions{"user-param": "val"}
+	if err := checkerUC.SetCheckerOptions(testCheckerName, &userId, nil, nil, opts); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	configs, err := db.GetCheckerConfiguration(testCheckerName, &userId, nil, nil)
+	if err != nil {
+		t.Fatalf("failed to retrieve config: %v", err)
+	}
+	found := false
+	for _, c := range configs {
+		if c.UserId != nil && c.DomainId == nil && c.ServiceId == nil {
+			found = true
+			break
+		}
+	}
+	if !found {
+		t.Error("expected a user-level configuration entry to be stored")
+	}
+}
+
+func Test_SetOptions_AdminLevel(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	opts := happydns.CheckerOptions{"run-param": "admin-val"}
+	if err := checkerUC.SetCheckerOptions(testCheckerName, nil, nil, nil, opts); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	configs, err := db.GetCheckerConfiguration(testCheckerName, nil, nil, nil)
+	if err != nil {
+		t.Fatalf("failed to retrieve config: %v", err)
+	}
+	if len(configs) == 0 {
+		t.Error("expected at least one admin-level configuration entry to be stored")
+	}
+}
+
+func Test_SetOptions_UnknownCheckerErrors(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	opts := happydns.CheckerOptions{"param": "val"}
+	if err := checkerUC.SetCheckerOptions("unknown-checker-xyz", nil, nil, nil, opts); err == nil {
+		t.Fatal("expected error for unknown checker")
+	}
+}
+
+// ---------------------------------------------------------------------------
+// OverwriteSomeCheckerOptions tests
+// ---------------------------------------------------------------------------
+
+func Test_Overwrite_MergesWithExisting(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	// Pre-seed existing options at admin scope.
+	if err := db.UpdateCheckerConfiguration(testCheckerName, nil, nil, nil, happydns.CheckerOptions{"a": "1"}); err != nil {
+		t.Fatalf("failed to seed option: %v", err)
+	}
+
+	if err := checkerUC.OverwriteSomeCheckerOptions(testCheckerName, nil, nil, nil, happydns.CheckerOptions{"b": "2"}); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	// Retrieve the stored options and verify both keys are present.
+	configs, err := db.GetCheckerConfiguration(testCheckerName, nil, nil, nil)
+	if err != nil {
+		t.Fatalf("failed to retrieve config: %v", err)
+	}
+	if len(configs) == 0 {
+		t.Fatal("expected at least one config entry")
+	}
+	merged := configs[0].Options
+	if merged["a"] != "1" {
+		t.Errorf("expected a='1' to be preserved, got %v", merged["a"])
+	}
+	if merged["b"] != "2" {
+		t.Errorf("expected b='2' to be added, got %v", merged["b"])
+	}
+}
+
+func Test_Overwrite_OverridesExistingKey(t *testing.T) {
+	db := newOptionsTestDB(t)
+	checkerUC := newTestCheckerUsecase(db)
+
+	// Pre-seed existing options.
+	if err := db.UpdateCheckerConfiguration(testCheckerName, nil, nil, nil, happydns.CheckerOptions{"a": "1"}); err != nil {
+		t.Fatalf("failed to seed option: %v", err)
+	}
+
+	if err := checkerUC.OverwriteSomeCheckerOptions(testCheckerName, nil, nil, nil, happydns.CheckerOptions{"a": "99"}); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	configs, err := db.GetCheckerConfiguration(testCheckerName, nil, nil, nil)
+	if err != nil {
+		t.Fatalf("failed to retrieve config: %v", err)
+	}
+	if len(configs) == 0 {
+		t.Fatal("expected at least one config entry")
+	}
+	if configs[0].Options["a"] != "99" {
+		t.Errorf("expected a='99' after overwrite, got %v", configs[0].Options["a"])
+	}
+}

internal/usecase/check/check_storage.go

@@ -0,0 +1,62 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package check
+
+import (
+	"git.happydns.org/happyDomain/model"
+)
+
+type CheckerStorage interface {
+	// ListAllCheckConfigurations retrieves the list of known Providers.
+	ListAllCheckerConfigurations() (happydns.Iterator[happydns.CheckerOptions], error)
+
+	// ListCheckerConfiguration retrieves all providers own by the given User.
+	ListCheckerConfiguration(string) ([]*happydns.CheckerOptionsPositional, error)
+
+	// GetCheckerConfiguration retrieves the full Provider with the given identifier and owner.
+	GetCheckerConfiguration(string, *happydns.Identifier, *happydns.Identifier, *happydns.Identifier) ([]*happydns.CheckerOptionsPositional, error)
+
+	// UpdateCheckerConfiguration updates the fields of the given Provider.
+	UpdateCheckerConfiguration(string, *happydns.Identifier, *happydns.Identifier, *happydns.Identifier, happydns.CheckerOptions) error
+
+	// DeleteCheckerConfiguration removes the given Provider from the database.
+	DeleteCheckerConfiguration(string, *happydns.Identifier, *happydns.Identifier, *happydns.Identifier) error
+
+	// ClearCheckerConfigurations deletes all Providers present in the database.
+	ClearCheckerConfigurations() error
+}
+
+// CheckAutoFillStorage provides the domain/zone/user lookups needed to
+// resolve auto-fill variables for test check options.
+type CheckAutoFillStorage interface {
+	// GetDomain retrieves the Domain with the given identifier.
+	GetDomain(domainid happydns.Identifier) (*happydns.Domain, error)
+
+	// GetUser retrieves the User with the given identifier.
+	GetUser(userid happydns.Identifier) (*happydns.User, error)
+
+	// ListDomains retrieves all Domains associated to the given User.
+	ListDomains(user *happydns.User) ([]*happydns.Domain, error)
+
+	// GetZone retrieves the full Zone (including Services and metadata) for the given identifier.
+	GetZone(zoneid happydns.Identifier) (*happydns.ZoneMessage, error)
+}

internal/usecase/check/check_usecase.go

@@ -0,0 +1,331 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package check
+
+import (
+	"cmp"
+	"fmt"
+	"log"
+	"maps"
+	"slices"
+
+	"git.happydns.org/happyDomain/checks"
+	"git.happydns.org/happyDomain/model"
+)
+
+type checkerUsecase struct {
+	config        *happydns.Options
+	store         CheckerStorage
+	autoFillStore CheckAutoFillStorage
+}
+
+func NewCheckerUsecase(cfg *happydns.Options, store CheckerStorage, autoFillStore CheckAutoFillStorage) happydns.CheckerUsecase {
+	return &checkerUsecase{
+		config:        cfg,
+		store:         store,
+		autoFillStore: autoFillStore,
+	}
+}
+
+func (tu *checkerUsecase) GetChecker(cname string) (happydns.Checker, error) {
+	checker, err := checks.FindChecker(cname)
+	if err != nil {
+		return nil, fmt.Errorf("unable to find check named %q: %w", cname, err)
+	}
+
+	return checker, nil
+}
+
+// copyNonEmpty copies key/value pairs from src into dst, skipping nil or empty-string values.
+func copyNonEmpty(dst, src happydns.CheckerOptions) {
+	for k, v := range src {
+		if v == nil {
+			continue
+		}
+		if s, ok := v.(string); ok && s == "" {
+			continue
+		}
+		dst[k] = v
+	}
+}
+
+func compareIdentifiers(a, b *happydns.Identifier) int {
+	if a == nil && b == nil {
+		return 0
+	}
+	if a == nil {
+		return -1
+	}
+	if b == nil {
+		return 1
+	}
+
+	if a.Equals(*b) {
+		return 0
+	}
+
+	return a.Compare(*b)
+}
+
+// CompareCheckerOptionsPositional defines the merge precedence ordering for
+// checker option configs: admin < user < domain < service.
+func CompareCheckerOptionsPositional(a, b *happydns.CheckerOptionsPositional) int {
+	if a.CheckName != b.CheckName {
+		return cmp.Compare(a.CheckName, b.CheckName)
+	}
+	if res := compareIdentifiers(a.UserId, b.UserId); res != 0 {
+		return res
+	}
+	if res := compareIdentifiers(a.DomainId, b.DomainId); res != 0 {
+		return res
+	}
+	return compareIdentifiers(a.ServiceId, b.ServiceId)
+}
+
+func (tu *checkerUsecase) GetCheckerOptions(cname string, userid *happydns.Identifier, domainid *happydns.Identifier, serviceid *happydns.Identifier) (*happydns.CheckerOptions, error) {
+	configs, err := tu.store.GetCheckerConfiguration(cname, userid, domainid, serviceid)
+	if err != nil {
+		return nil, err
+	}
+
+	slices.SortFunc(configs, CompareCheckerOptionsPositional)
+
+	opts := make(happydns.CheckerOptions)
+
+	for _, c := range configs {
+		maps.Copy(opts, c.Options)
+	}
+
+	return &opts, nil
+}
+
+func (tu *checkerUsecase) ListCheckers() (*map[string]happydns.Checker, error) {
+	return checks.GetCheckers(), nil
+}
+
+// GetStoredCheckerOptionsNoDefault returns the stored options (user/domain/service scopes)
+// with auto-fill variables applied, but without checker-defined defaults or run-time overrides.
+func (tu *checkerUsecase) GetStoredCheckerOptionsNoDefault(cname string, userid *happydns.Identifier, domainid *happydns.Identifier, serviceid *happydns.Identifier) (happydns.CheckerOptions, error) {
+	stored, err := tu.GetCheckerOptions(cname, userid, domainid, serviceid)
+	if err != nil {
+		return nil, err
+	}
+
+	var opts happydns.CheckerOptions
+	if stored != nil {
+		opts = *stored
+	} else {
+		opts = make(happydns.CheckerOptions)
+	}
+
+	checker, err := tu.GetChecker(cname)
+	if err != nil {
+		return opts, nil
+	}
+
+	return tu.applyAutoFill(checker, userid, domainid, serviceid, opts), nil
+}
+
+// BuildMergedCheckerOptions merges checker options from all sources in priority order:
+// checker defaults < stored (user/domain/service) options < runOpts < auto-fill variables.
+func (tu *checkerUsecase) BuildMergedCheckerOptions(cname string, userid *happydns.Identifier, domainid *happydns.Identifier, serviceid *happydns.Identifier, runOpts happydns.CheckerOptions) (happydns.CheckerOptions, error) {
+	merged := make(happydns.CheckerOptions)
+
+	// 1. Fill checker defaults.
+	checker, err := tu.GetChecker(cname)
+	if err != nil {
+		log.Printf("Warning: unable to get checker %q for default options: %v", cname, err)
+	} else {
+		opts := checker.Options()
+
+		allOpts := []happydns.CheckerOptionDocumentation{}
+		allOpts = append(allOpts, opts.RunOpts...)
+		allOpts = append(allOpts, opts.ServiceOpts...)
+		allOpts = append(allOpts, opts.DomainOpts...)
+		allOpts = append(allOpts, opts.UserOpts...)
+		allOpts = append(allOpts, opts.AdminOpts...)
+		for _, opt := range allOpts {
+			if opt.Default != nil {
+				merged[opt.Id] = opt.Default
+			} else if opt.Placeholder != "" {
+				merged[opt.Id] = opt.Placeholder
+			}
+		}
+	}
+
+	// 2. Override with stored options (user/domain/service scopes).
+	baseOptions, err := tu.GetCheckerOptions(cname, userid, domainid, serviceid)
+	if err != nil {
+		return merged, fmt.Errorf("could not fetch stored checker options for %s: %w", cname, err)
+	}
+	if baseOptions != nil {
+		copyNonEmpty(merged, *baseOptions)
+	}
+
+	// 3. Override with caller-supplied run options.
+	copyNonEmpty(merged, runOpts)
+
+	// 4. Inject auto-fill variables (always win over any user-supplied value).
+	if checker != nil {
+		merged = tu.applyAutoFill(checker, userid, domainid, serviceid, merged)
+	}
+
+	return merged, nil
+}
+
+// applyAutoFill resolves auto-fill fields declared by the checker and injects
+// the context-resolved values into a copy of opts.
+func (tu *checkerUsecase) applyAutoFill(
+	checker happydns.Checker,
+	userid *happydns.Identifier,
+	domainid *happydns.Identifier,
+	serviceid *happydns.Identifier,
+	opts happydns.CheckerOptions,
+) happydns.CheckerOptions {
+	// Collect which auto-fill keys are needed.
+	needed := make(map[string]string) // autoFill constant → field id
+	options := checker.Options()
+	for _, groups := range [][]happydns.CheckerOptionDocumentation{
+		options.RunOpts, options.DomainOpts, options.ServiceOpts,
+		options.UserOpts, options.AdminOpts,
+	} {
+		for _, opt := range groups {
+			if opt.AutoFill != "" {
+				needed[opt.AutoFill] = opt.Id
+			}
+		}
+	}
+
+	if len(needed) == 0 || tu.autoFillStore == nil {
+		return opts
+	}
+
+	autoFillCtx := tu.buildAutoFillContext(userid, domainid, serviceid)
+
+	result := maps.Clone(opts)
+	for autoFillKey, fieldId := range needed {
+		if val, ok := autoFillCtx[autoFillKey]; ok {
+			result[fieldId] = val
+		}
+	}
+	return result
+}
+
+// buildAutoFillContext resolves the available auto-fill values for the given
+// user/domain/service identifiers.
+func (tu *checkerUsecase) buildAutoFillContext(userid *happydns.Identifier, domainid *happydns.Identifier, serviceid *happydns.Identifier) map[string]any {
+	ctx := make(map[string]any)
+
+	if domainid != nil {
+		if domain, err := tu.autoFillStore.GetDomain(*domainid); err == nil {
+			ctx[happydns.AutoFillDomainName] = domain.DomainName
+
+			if len(domain.ZoneHistory) > 0 {
+				// The first element in ZoneHistory is the current (most recent) zone.
+				zoneMsg, err := tu.autoFillStore.GetZone(domain.ZoneHistory[0])
+				if err == nil {
+					ctx[happydns.AutoFillZone] = zoneMsg
+				}
+			}
+		}
+	} else if serviceid != nil && userid != nil {
+		// To resolve service context we need to find which domain/zone owns the service.
+		user, err := tu.autoFillStore.GetUser(*userid)
+		if err != nil {
+			return ctx
+		}
+		domains, err := tu.autoFillStore.ListDomains(user)
+		if err != nil {
+			return ctx
+		}
+		for _, domain := range domains {
+			if len(domain.ZoneHistory) == 0 {
+				continue
+			}
+			// The first element in ZoneHistory is the current (most recent) zone.
+			zoneMsg, err := tu.autoFillStore.GetZone(domain.ZoneHistory[0])
+			if err != nil {
+				continue
+			}
+			for subdomain, svcs := range zoneMsg.Services {
+				for _, svc := range svcs {
+					if svc.Id.Equals(*serviceid) {
+						ctx[happydns.AutoFillDomainName] = domain.DomainName
+						ctx[happydns.AutoFillSubdomain] = string(subdomain)
+						ctx[happydns.AutoFillZone] = zoneMsg
+						ctx[happydns.AutoFillService] = svc
+						ctx[happydns.AutoFillServiceType] = svc.Type
+						return ctx
+					}
+				}
+			}
+		}
+	}
+
+	return ctx
+}
+
+func (tu *checkerUsecase) SetCheckerOptions(cname string, userid *happydns.Identifier, domainid *happydns.Identifier, serviceid *happydns.Identifier, opts happydns.CheckerOptions) error {
+	// filter opts that correspond to the level set
+	checker, err := tu.GetChecker(cname)
+	if err != nil {
+		return fmt.Errorf("unable to get checker: %w", err)
+	}
+
+	options := checker.Options()
+
+	var relevantOpts []happydns.CheckerOptionDocumentation
+	if serviceid != nil {
+		relevantOpts = options.ServiceOpts
+	} else if domainid != nil {
+		relevantOpts = options.DomainOpts
+	} else if userid != nil {
+		relevantOpts = options.UserOpts
+	} else {
+		relevantOpts = options.AdminOpts
+	}
+
+	allowed := make(map[string]struct{}, len(relevantOpts))
+	for _, opt := range relevantOpts {
+		allowed[opt.Id] = struct{}{}
+	}
+
+	filteredOpts := make(happydns.CheckerOptions)
+	for id := range allowed {
+		if val, exists := opts[id]; exists && val != "" {
+			filteredOpts[id] = val
+		}
+	}
+
+	return tu.store.UpdateCheckerConfiguration(cname, userid, domainid, serviceid, filteredOpts)
+}
+
+func (tu *checkerUsecase) OverwriteSomeCheckerOptions(cname string, userid *happydns.Identifier, domainid *happydns.Identifier, serviceid *happydns.Identifier, opts happydns.CheckerOptions) error {
+	current, err := tu.GetCheckerOptions(cname, userid, domainid, serviceid)
+	if err != nil {
+		return err
+	}
+
+	maps.Copy(*current, opts)
+
+	return tu.store.UpdateCheckerConfiguration(cname, userid, domainid, serviceid, *current)
+}

internal/usecase/check/check_usecase_test.go

@@ -0,0 +1,85 @@
+package check_test
+
+import (
+	"slices"
+	"testing"
+
+	uc "git.happydns.org/happyDomain/internal/usecase/check"
+	"git.happydns.org/happyDomain/model"
+)
+
+func TestSortByCheckName(t *testing.T) {
+	slice := []*happydns.CheckerOptionsPositional{
+		{CheckName: "zeta"},
+		{CheckName: "alpha"},
+		{CheckName: "beta"},
+	}
+
+	slices.SortFunc(slice, uc.CompareCheckerOptionsPositional)
+
+	got := []string{slice[0].CheckName, slice[1].CheckName, slice[2].CheckName}
+	want := []string{"alpha", "beta", "zeta"}
+
+	for i := range want {
+		if got[i] != want[i] {
+			t.Errorf("expected %v, got %v", want, got)
+			break
+		}
+	}
+}
+
+func TestNilBeforeNonNil(t *testing.T) {
+	uid, _ := happydns.NewRandomIdentifier()
+	slice := []*happydns.CheckerOptionsPositional{
+		{CheckName: "alpha", UserId: &uid},
+		{CheckName: "alpha", UserId: nil},
+	}
+
+	slices.SortFunc(slice, uc.CompareCheckerOptionsPositional)
+
+	if slice[0].UserId != nil {
+		t.Errorf("expected nil UserId first, got %+v", slice[0].UserId)
+	}
+}
+
+func TestDomainIdOrder(t *testing.T) {
+	did, _ := happydns.NewRandomIdentifier()
+	slice := []*happydns.CheckerOptionsPositional{
+		{CheckName: "alpha", UserId: nil, DomainId: &did},
+		{CheckName: "alpha", UserId: nil, DomainId: nil},
+	}
+
+	slices.SortFunc(slice, uc.CompareCheckerOptionsPositional)
+
+	if slice[0].DomainId != nil {
+		t.Errorf("expected nil DomainId first, got %+v", slice[0].DomainId)
+	}
+}
+
+func TestServiceIdOrder(t *testing.T) {
+	sid, _ := happydns.NewRandomIdentifier()
+	slice := []*happydns.CheckerOptionsPositional{
+		{CheckName: "alpha", UserId: nil, DomainId: nil, ServiceId: &sid},
+		{CheckName: "alpha", UserId: nil, DomainId: nil, ServiceId: nil},
+	}
+
+	slices.SortFunc(slice, uc.CompareCheckerOptionsPositional)
+
+	if slice[0].ServiceId != nil {
+		t.Errorf("expected nil ServiceId first, got %+v", slice[0].ServiceId)
+	}
+}
+
+func TestStableGrouping(t *testing.T) {
+	uid, _ := happydns.NewRandomIdentifier()
+
+	slice := []*happydns.CheckerOptionsPositional{
+		{CheckName: "alpha", UserId: &uid},
+		{CheckName: "alpha", UserId: &uid},
+	}
+
+	slices.SortFunc(slice, uc.CompareCheckerOptionsPositional)
+	if slice[0].CheckName != slice[1].CheckName {
+		t.Errorf("expected grouping, got %+v vs %+v", slice[0], slice[1])
+	}
+}

internal/usecase/checkresult/checkresult_usecase.go

@@ -0,0 +1,434 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package checkresult
+
+import (
+	"fmt"
+	"slices"
+	"time"
+
+	"git.happydns.org/happyDomain/model"
+)
+
+// CheckResultUsecase implements business logic for check results
+type CheckResultUsecase struct {
+	storage           CheckResultStorage
+	options           *happydns.Options
+	checkerUC         happydns.CheckerUsecase
+	checkerScheduleUC happydns.CheckerScheduleUsecase
+}
+
+// NewCheckResultUsecase creates a new check result usecase
+func NewCheckResultUsecase(storage CheckResultStorage, options *happydns.Options, checkerUC happydns.CheckerUsecase, checkerScheduleUC happydns.CheckerScheduleUsecase) *CheckResultUsecase {
+	return &CheckResultUsecase{
+		storage:           storage,
+		options:           options,
+		checkerUC:         checkerUC,
+		checkerScheduleUC: checkerScheduleUC,
+	}
+}
+
+// ListCheckerStatuses returns all checkers applicable to scope with their schedule
+// and most recent result for the given target.
+func (u *CheckResultUsecase) ListCheckerStatuses(scope happydns.CheckScopeType, targetID happydns.Identifier, insideScope *happydns.CheckScopeType, insideID *happydns.Identifier, user *happydns.User, domain *happydns.Domain, service *happydns.Service) ([]happydns.CheckerStatus, error) {
+	plugins, err := u.checkerUC.ListCheckers()
+	if err != nil {
+		return nil, err
+	}
+
+	// Get schedules for this target
+	schedules, err := u.checkerScheduleUC.ListSchedulesByTarget(scope, targetID, insideScope, insideID)
+	if err != nil {
+		return nil, err
+	}
+
+	// Build schedule map
+	scheduleMap := make(map[string]*happydns.CheckerSchedule, len(schedules))
+	for _, sched := range schedules {
+		if sched.OwnerId.Equals(user.Id) {
+			scheduleMap[sched.CheckerName] = sched
+		}
+	}
+
+	// Get service type for LimitToServices filtering
+	var serviceType string
+	if scope == happydns.CheckScopeService && service != nil {
+		serviceType = service.Type
+	}
+
+	// Build response with last results
+	var statuses []happydns.CheckerStatus
+	for checkername, check := range *plugins {
+		// Filter plugins by scope
+		if scope == happydns.CheckScopeDomain && !check.Availability().ApplyToDomain {
+			continue
+		}
+		if scope == happydns.CheckScopeService && !check.Availability().ApplyToService {
+			continue
+		}
+
+		// Filter plugins by service type if LimitToServices is set
+		if scope == happydns.CheckScopeService && serviceType != "" {
+			limitTo := check.Availability().LimitToServices
+			if len(limitTo) > 0 && !slices.Contains(limitTo, serviceType) {
+				continue
+			}
+		}
+
+		info := happydns.CheckerStatus{
+			CheckerName:   checkername,
+			NotDiscovered: true,
+		}
+
+		// Check if there's a schedule
+		if sched, ok := scheduleMap[checkername]; ok {
+			info.Enabled = sched.Enabled
+			info.Schedule = sched
+			info.NotDiscovered = false
+
+			// Get last result
+			results, err := u.ListCheckResultsByTarget(checkername, scope, targetID, insideScope, insideID, user.Id, 1)
+			if err == nil && len(results) > 0 {
+				info.LastResult = results[0]
+			}
+		}
+
+		statuses = append(statuses, info)
+	}
+
+	return statuses, nil
+}
+
+// ListCheckResultsByTarget retrieves check results for a specific target owned by userId
+func (u *CheckResultUsecase) ListCheckResultsByTarget(pluginName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, insideScope *happydns.CheckScopeType, insideID *happydns.Identifier, userId happydns.Identifier, limit int) ([]*happydns.CheckResult, error) {
+	// Apply default limit if not specified
+	if limit <= 0 {
+		limit = 5 // Default to 5 most recent results
+	}
+
+	results, err := u.storage.ListCheckResults(pluginName, targetType, targetId, limit)
+	if err != nil {
+		return nil, err
+	}
+
+	results = filterResultsByInside(results, insideScope, insideID)
+
+	// Filter by owner
+	owned := results[:0]
+	for _, r := range results {
+		if r.OwnerId.Equals(userId) {
+			owned = append(owned, r)
+		}
+	}
+
+	return owned, nil
+}
+
+// ListAllCheckResultsByTarget retrieves all check results for a target across all plugins
+func (u *CheckResultUsecase) ListAllCheckResultsByTarget(targetType happydns.CheckScopeType, targetId happydns.Identifier, insideScope *happydns.CheckScopeType, insideID *happydns.Identifier, userId happydns.Identifier, limit int) ([]*happydns.CheckResult, error) {
+	// Get all results for the user and filter by target
+	allResults, err := u.storage.ListCheckResultsByUser(userId, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	// Filter by target
+	var results []*happydns.CheckResult
+	for _, r := range allResults {
+		if r.CheckType == targetType && r.TargetId.Equals(targetId) {
+			results = append(results, r)
+		}
+	}
+
+	results = filterResultsByInside(results, insideScope, insideID)
+
+	// Apply limit
+	if limit > 0 && len(results) > limit {
+		results = results[:limit]
+	}
+
+	return results, nil
+}
+
+// filterResultsByInside filters check results by insideScope/insideID.
+// If insideScope is nil, only results with nil InsideType are returned.
+func filterResultsByInside(results []*happydns.CheckResult, insideScope *happydns.CheckScopeType, insideID *happydns.Identifier) []*happydns.CheckResult {
+	filtered := results[:0]
+	for _, r := range results {
+		if insideScope == nil {
+			if r.InsideType == nil {
+				filtered = append(filtered, r)
+			}
+		} else {
+			if r.InsideType != nil && *r.InsideType == *insideScope && insideID != nil && r.InsideId != nil && r.InsideId.Equals(*insideID) {
+				filtered = append(filtered, r)
+			}
+		}
+	}
+	return filtered
+}
+
+// GetCheckResult retrieves a specific check result owned by userId
+func (u *CheckResultUsecase) GetCheckResult(pluginName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, resultId happydns.Identifier, insideScope *happydns.CheckScopeType, insideID *happydns.Identifier, userId happydns.Identifier) (*happydns.CheckResult, error) {
+	result, err := u.storage.GetCheckResult(pluginName, targetType, targetId, resultId)
+	if err != nil {
+		return nil, err
+	}
+
+	// Verify the result belongs to the expected inside scope
+	if insideScope == nil {
+		if result.InsideType != nil {
+			return nil, happydns.ErrNotFound
+		}
+	} else {
+		if result.InsideType == nil || *result.InsideType != *insideScope || insideID == nil || result.InsideId == nil || !result.InsideId.Equals(*insideID) {
+			return nil, happydns.ErrNotFound
+		}
+	}
+
+	// Verify ownership
+	if !result.OwnerId.Equals(userId) {
+		return nil, happydns.ErrNotFound
+	}
+
+	return result, nil
+}
+
+// CreateCheckResult stores a new check result and enforces retention policy
+func (u *CheckResultUsecase) CreateCheckResult(result *happydns.CheckResult) error {
+	// Store the result
+	if err := u.storage.CreateCheckResult(result); err != nil {
+		return err
+	}
+
+	// Enforce retention policy
+	maxResults := u.options.MaxResultsPerCheck
+	if maxResults <= 0 {
+		maxResults = 100 // Default
+	}
+
+	return u.storage.DeleteOldCheckResults(result.CheckerName, result.CheckType, result.TargetId, maxResults)
+}
+
+// DeleteCheckResult removes a specific check result owned by userId
+func (u *CheckResultUsecase) DeleteCheckResult(pluginName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, resultId happydns.Identifier, insideScope *happydns.CheckScopeType, insideID *happydns.Identifier, userId happydns.Identifier) error {
+	result, err := u.storage.GetCheckResult(pluginName, targetType, targetId, resultId)
+	if err != nil {
+		return err
+	}
+	if !result.OwnerId.Equals(userId) {
+		return happydns.ErrNotFound
+	}
+	return u.storage.DeleteCheckResult(pluginName, targetType, targetId, resultId)
+}
+
+// DeleteAllCheckResults removes all results for a specific plugin+target combination owned by userId
+func (u *CheckResultUsecase) DeleteAllCheckResults(pluginName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, insideScope *happydns.CheckScopeType, insideID *happydns.Identifier, userId happydns.Identifier) error {
+	// Get all results first
+	results, err := u.storage.ListCheckResults(pluginName, targetType, targetId, 0)
+	if err != nil {
+		return err
+	}
+
+	results = filterResultsByInside(results, insideScope, insideID)
+
+	// Delete only results owned by the requesting user
+	for _, r := range results {
+		if !r.OwnerId.Equals(userId) {
+			continue
+		}
+		if err := u.storage.DeleteCheckResult(pluginName, targetType, targetId, r.Id); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// CleanupOldResults removes check results older than retention period
+func (u *CheckResultUsecase) CleanupOldResults() error {
+	retentionDays := u.options.ResultRetentionDays
+	if retentionDays <= 0 {
+		retentionDays = 90 // Default
+	}
+
+	cutoffTime := time.Now().AddDate(0, 0, -retentionDays)
+
+	// Get all results for all users (inefficient but necessary without a time-based index)
+	// In a production system, you might want to add a time-based index for this
+	// For now, we'll iterate through results and delete old ones
+
+	// This is a placeholder - the actual implementation would need to be optimized
+	// based on specific storage patterns
+	_ = cutoffTime
+
+	return nil
+}
+
+// GetCheckExecution retrieves the status of a check execution
+func (u *CheckResultUsecase) GetCheckExecution(executionId happydns.Identifier) (*happydns.CheckExecution, error) {
+	return u.storage.GetCheckExecution(executionId)
+}
+
+// CreateCheckExecution creates a new check execution record
+func (u *CheckResultUsecase) CreateCheckExecution(execution *happydns.CheckExecution) error {
+	if execution.StartedAt.IsZero() {
+		execution.StartedAt = time.Now()
+	}
+	return u.storage.CreateCheckExecution(execution)
+}
+
+// UpdateCheckExecution updates an existing check execution
+func (u *CheckResultUsecase) UpdateCheckExecution(execution *happydns.CheckExecution) error {
+	return u.storage.UpdateCheckExecution(execution)
+}
+
+// CompleteCheckExecution marks an execution as completed with a result
+func (u *CheckResultUsecase) CompleteCheckExecution(executionId happydns.Identifier, resultId happydns.Identifier) error {
+	execution, err := u.storage.GetCheckExecution(executionId)
+	if err != nil {
+		return err
+	}
+
+	now := time.Now()
+	execution.Status = happydns.CheckExecutionCompleted
+	execution.CompletedAt = &now
+	execution.ResultId = &resultId
+
+	return u.storage.UpdateCheckExecution(execution)
+}
+
+// FailCheckExecution marks an execution as failed
+func (u *CheckResultUsecase) FailCheckExecution(executionId happydns.Identifier, errorMsg string) error {
+	execution, err := u.storage.GetCheckExecution(executionId)
+	if err != nil {
+		return err
+	}
+
+	now := time.Now()
+	execution.Status = happydns.CheckExecutionFailed
+	execution.CompletedAt = &now
+
+	// Store error in a result
+	result := &happydns.CheckResult{
+		CheckerName:    execution.CheckerName,
+		CheckType:      execution.TargetType,
+		TargetId:       execution.TargetId,
+		InsideType:     execution.InsideType,
+		InsideId:       execution.InsideId,
+		OwnerId:        execution.OwnerId,
+		ExecutedAt:     time.Now(),
+		ScheduledCheck: execution.ScheduleId != nil,
+		Options:        execution.Options,
+		Status:         happydns.CheckResultStatusCritical,
+		StatusLine:     "Execution failed",
+		Error:          errorMsg,
+		Duration:       now.Sub(execution.StartedAt),
+	}
+
+	if err := u.CreateCheckResult(result); err != nil {
+		return fmt.Errorf("failed to create error result: %w", err)
+	}
+
+	execution.ResultId = &result.Id
+
+	return u.storage.UpdateCheckExecution(execution)
+}
+
+// GetWorstCheckStatus returns the worst (most critical) status from the most
+// recent result of each checker for a given target. Returns nil if no results exist.
+func (u *CheckResultUsecase) GetWorstCheckStatus(targetType happydns.CheckScopeType, targetId happydns.Identifier, insideScope *happydns.CheckScopeType, insideID *happydns.Identifier, userId happydns.Identifier) (*happydns.CheckResultStatus, error) {
+	results, err := u.ListAllCheckResultsByTarget(targetType, targetId, insideScope, insideID, userId, 0)
+	if err != nil || len(results) == 0 {
+		return nil, err
+	}
+
+	// Keep only the latest result per checker
+	latest := map[string]*happydns.CheckResult{}
+	for _, r := range results {
+		if prev, ok := latest[r.CheckerName]; !ok || r.ExecutedAt.After(prev.ExecutedAt) {
+			latest[r.CheckerName] = r
+		}
+	}
+
+	// Find minimum (worst) status among latest results, ignoring Unknown (which
+	// means the check couldn't run, not that the domain is in a bad state).
+	var worst *happydns.CheckResultStatus
+	for _, r := range latest {
+		s := r.Status
+		if s == happydns.CheckResultStatusUnknown {
+			continue
+		}
+		if worst == nil || s < *worst {
+			worst = &s
+		}
+	}
+
+	return worst, nil
+}
+
+// GetWorstCheckStatusByUser fetches all results for the user once and returns
+// a map from target ID string to worst (most critical) status per target.
+func (u *CheckResultUsecase) GetWorstCheckStatusByUser(targetType happydns.CheckScopeType, userId happydns.Identifier) (map[string]*happydns.CheckResultStatus, error) {
+	allResults, err := u.storage.ListCheckResultsByUser(userId, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	type key struct {
+		target  string
+		checker string
+	}
+	latest := map[key]*happydns.CheckResult{}
+	for _, r := range allResults {
+		if r.CheckType != targetType || r.CheckerName == "" {
+			continue
+		}
+		k := key{target: r.TargetId.String(), checker: r.CheckerName}
+		if prev, ok := latest[k]; !ok || r.ExecutedAt.After(prev.ExecutedAt) {
+			latest[k] = r
+		}
+	}
+
+	worst := map[string]*happydns.CheckResultStatus{}
+	for k, r := range latest {
+		s := r.Status
+		if prev, ok := worst[k.target]; !ok || s < *prev {
+			worst[k.target] = &s
+		}
+	}
+
+	return worst, nil
+}
+
+// DeleteCompletedExecutions removes execution records that are completed
+func (u *CheckResultUsecase) DeleteCompletedExecutions(olderThan time.Duration) error {
+	cutoffTime := time.Now().Add(-olderThan)
+
+	// Get active executions (this won't include completed ones)
+	// We need a different query to get completed executions older than cutoff
+	// For now, this is a placeholder
+
+	_ = cutoffTime
+
+	return nil
+}

internal/usecase/checkresult/checkresult_usecase_test.go

@@ -0,0 +1,490 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package checkresult_test
+
+import (
+	"testing"
+	"time"
+
+	"git.happydns.org/happyDomain/internal/storage"
+	"git.happydns.org/happyDomain/internal/storage/inmemory"
+	kv "git.happydns.org/happyDomain/internal/storage/kvtpl"
+	checkresultUC "git.happydns.org/happyDomain/internal/usecase/checkresult"
+	"git.happydns.org/happyDomain/model"
+)
+
+// newTestDB creates a fresh in-memory storage for each test.
+func newTestDB(t *testing.T) storage.Storage {
+	t.Helper()
+	mem, err := inmemory.NewInMemoryStorage()
+	if err != nil {
+		t.Fatalf("failed to create in-memory storage: %v", err)
+	}
+	db, err := kv.NewKVDatabase(mem)
+	if err != nil {
+		t.Fatalf("failed to create KV database: %v", err)
+	}
+	return db
+}
+
+func newTestCheckResultUsecase(db storage.Storage, maxResults int) *checkresultUC.CheckResultUsecase {
+	return checkresultUC.NewCheckResultUsecase(db, &happydns.Options{MaxResultsPerCheck: maxResults}, nil, nil)
+}
+
+// ---------------------------------------------------------------------------
+// CreateCheckResult tests
+// ---------------------------------------------------------------------------
+
+func Test_CreateCheckResult_DefaultMaxResults(t *testing.T) {
+	db := newTestDB(t)
+	// MaxResultsPerCheck=0 → default 100; verify results are stored correctly.
+	uc := newTestCheckResultUsecase(db, 0)
+
+	targetId, _ := happydns.NewRandomIdentifier()
+	ownerId, _ := happydns.NewRandomIdentifier()
+
+	result := &happydns.CheckResult{
+		CheckerName: "checker",
+		CheckType:   happydns.CheckScopeDomain,
+		TargetId:    targetId,
+		OwnerId:     ownerId,
+		ExecutedAt:  time.Now(),
+	}
+
+	if err := uc.CreateCheckResult(result); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if result.Id.IsEmpty() {
+		t.Error("expected result to have a non-empty ID after create")
+	}
+
+	stored, err := db.ListCheckResults("checker", happydns.CheckScopeDomain, targetId, 0)
+	if err != nil {
+		t.Fatalf("unexpected error listing results: %v", err)
+	}
+	if len(stored) != 1 {
+		t.Errorf("expected 1 stored result, got %d", len(stored))
+	}
+}
+
+func Test_CreateCheckResult_CustomMaxResults(t *testing.T) {
+	db := newTestDB(t)
+	// MaxResultsPerCheck=3: pre-seed 5 results, create 1 more → expect 3 to remain.
+	uc := newTestCheckResultUsecase(db, 3)
+
+	targetId, _ := happydns.NewRandomIdentifier()
+	ownerId, _ := happydns.NewRandomIdentifier()
+
+	for i := range 5 {
+		r := &happydns.CheckResult{
+			CheckerName: "checker",
+			CheckType:   happydns.CheckScopeDomain,
+			TargetId:    targetId,
+			OwnerId:     ownerId,
+			ExecutedAt:  time.Now().Add(-time.Duration(5-i) * time.Minute),
+		}
+		if err := db.CreateCheckResult(r); err != nil {
+			t.Fatalf("failed to seed result: %v", err)
+		}
+	}
+
+	// Creating one more via the usecase triggers retention → prune to 3.
+	if err := uc.CreateCheckResult(&happydns.CheckResult{
+		CheckerName: "checker",
+		CheckType:   happydns.CheckScopeDomain,
+		TargetId:    targetId,
+		OwnerId:     ownerId,
+		ExecutedAt:  time.Now(),
+	}); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	remaining, err := db.ListCheckResults("checker", happydns.CheckScopeDomain, targetId, 0)
+	if err != nil {
+		t.Fatalf("unexpected error listing results: %v", err)
+	}
+	if len(remaining) != 3 {
+		t.Errorf("expected 3 results after retention (MaxResultsPerCheck=3), got %d", len(remaining))
+	}
+}
+
+func Test_CreateCheckResult_StoresResult(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckResultUsecase(db, 10)
+
+	targetId, _ := happydns.NewRandomIdentifier()
+	ownerId, _ := happydns.NewRandomIdentifier()
+
+	result := &happydns.CheckResult{
+		CheckerName: "checker",
+		CheckType:   happydns.CheckScopeDomain,
+		TargetId:    targetId,
+		OwnerId:     ownerId,
+		ExecutedAt:  time.Now(),
+	}
+
+	if err := uc.CreateCheckResult(result); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if result.Id.IsEmpty() {
+		t.Error("expected result to have a non-empty ID after create")
+	}
+
+	// Verify retrievable from storage.
+	fetched, err := db.GetCheckResult("checker", happydns.CheckScopeDomain, targetId, result.Id)
+	if err != nil {
+		t.Fatalf("expected result to be retrievable: %v", err)
+	}
+	if fetched.Id.IsEmpty() {
+		t.Error("retrieved result has empty ID")
+	}
+}
+
+// ---------------------------------------------------------------------------
+// ListCheckResultsByTarget tests
+// ---------------------------------------------------------------------------
+
+func Test_ListCheckResultsByTarget_DefaultLimit(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckResultUsecase(db, 100)
+
+	targetId, _ := happydns.NewRandomIdentifier()
+	ownerId, _ := happydns.NewRandomIdentifier()
+
+	for i := range 8 {
+		r := &happydns.CheckResult{
+			CheckerName: "checker",
+			CheckType:   happydns.CheckScopeDomain,
+			TargetId:    targetId,
+			OwnerId:     ownerId,
+			ExecutedAt:  time.Now().Add(time.Duration(i) * time.Second),
+		}
+		if err := db.CreateCheckResult(r); err != nil {
+			t.Fatalf("failed to seed result: %v", err)
+		}
+	}
+
+	results, err := uc.ListCheckResultsByTarget("checker", happydns.CheckScopeDomain, targetId, nil, nil, ownerId, 0)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(results) > 5 {
+		t.Errorf("expected at most 5 results (default limit), got %d", len(results))
+	}
+}
+
+func Test_ListCheckResultsByTarget_CustomLimit(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckResultUsecase(db, 100)
+
+	targetId, _ := happydns.NewRandomIdentifier()
+	ownerId, _ := happydns.NewRandomIdentifier()
+
+	for i := range 4 {
+		r := &happydns.CheckResult{
+			CheckerName: "checker",
+			CheckType:   happydns.CheckScopeDomain,
+			TargetId:    targetId,
+			OwnerId:     ownerId,
+			ExecutedAt:  time.Now().Add(time.Duration(i) * time.Second),
+		}
+		if err := db.CreateCheckResult(r); err != nil {
+			t.Fatalf("failed to seed result: %v", err)
+		}
+	}
+
+	results, err := uc.ListCheckResultsByTarget("checker", happydns.CheckScopeDomain, targetId, nil, nil, ownerId, 2)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(results) != 2 {
+		t.Errorf("expected 2 results with limit=2, got %d", len(results))
+	}
+}
+
+// ---------------------------------------------------------------------------
+// DeleteAllCheckResults tests
+// ---------------------------------------------------------------------------
+
+func Test_DeleteAllCheckResults_Empty(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckResultUsecase(db, 10)
+
+	targetId, _ := happydns.NewRandomIdentifier()
+
+	if err := uc.DeleteAllCheckResults("checker", happydns.CheckScopeDomain, targetId, nil, nil, targetId); err != nil {
+		t.Fatalf("unexpected error on empty store: %v", err)
+	}
+}
+
+func Test_DeleteAllCheckResults_OnlyTargetDeleted(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckResultUsecase(db, 100)
+
+	targetId1, _ := happydns.NewRandomIdentifier()
+	targetId2, _ := happydns.NewRandomIdentifier()
+	ownerId, _ := happydns.NewRandomIdentifier()
+
+	for range 3 {
+		r := &happydns.CheckResult{
+			CheckerName: "checker",
+			CheckType:   happydns.CheckScopeDomain,
+			TargetId:    targetId1,
+			OwnerId:     ownerId,
+			ExecutedAt:  time.Now(),
+		}
+		if err := db.CreateCheckResult(r); err != nil {
+			t.Fatalf("failed to seed targetId1 result: %v", err)
+		}
+	}
+	for range 2 {
+		r := &happydns.CheckResult{
+			CheckerName: "checker",
+			CheckType:   happydns.CheckScopeDomain,
+			TargetId:    targetId2,
+			OwnerId:     ownerId,
+			ExecutedAt:  time.Now(),
+		}
+		if err := db.CreateCheckResult(r); err != nil {
+			t.Fatalf("failed to seed targetId2 result: %v", err)
+		}
+	}
+
+	if err := uc.DeleteAllCheckResults("checker", happydns.CheckScopeDomain, targetId1, nil, nil, ownerId); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	remaining1, _ := db.ListCheckResults("checker", happydns.CheckScopeDomain, targetId1, 0)
+	if len(remaining1) != 0 {
+		t.Errorf("expected 0 results for targetId1 after delete, got %d", len(remaining1))
+	}
+
+	remaining2, _ := db.ListCheckResults("checker", happydns.CheckScopeDomain, targetId2, 0)
+	if len(remaining2) != 2 {
+		t.Errorf("expected 2 results for targetId2 to remain, got %d", len(remaining2))
+	}
+}
+
+// ---------------------------------------------------------------------------
+// CreateCheckExecution tests
+// ---------------------------------------------------------------------------
+
+func Test_CreateCheckExecution_SetsStartedAt(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckResultUsecase(db, 10)
+
+	targetId, _ := happydns.NewRandomIdentifier()
+	ownerId, _ := happydns.NewRandomIdentifier()
+
+	execution := &happydns.CheckExecution{
+		CheckerName: "checker",
+		OwnerId:     ownerId,
+		TargetType:  happydns.CheckScopeDomain,
+		TargetId:    targetId,
+	}
+
+	before := time.Now()
+	if err := uc.CreateCheckExecution(execution); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	after := time.Now()
+
+	if execution.StartedAt.IsZero() {
+		t.Error("expected StartedAt to be set")
+	}
+	if execution.StartedAt.Before(before) || execution.StartedAt.After(after) {
+		t.Errorf("StartedAt %v not in expected range [%v, %v]", execution.StartedAt, before, after)
+	}
+}
+
+func Test_CreateCheckExecution_PreservesStartedAt(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckResultUsecase(db, 10)
+
+	targetId, _ := happydns.NewRandomIdentifier()
+	ownerId, _ := happydns.NewRandomIdentifier()
+	specificTime := time.Date(2024, 1, 15, 10, 0, 0, 0, time.UTC)
+
+	execution := &happydns.CheckExecution{
+		CheckerName: "checker",
+		OwnerId:     ownerId,
+		TargetType:  happydns.CheckScopeDomain,
+		TargetId:    targetId,
+		StartedAt:   specificTime,
+	}
+
+	if err := uc.CreateCheckExecution(execution); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if !execution.StartedAt.Equal(specificTime) {
+		t.Errorf("expected StartedAt to be preserved as %v, got %v", specificTime, execution.StartedAt)
+	}
+}
+
+// ---------------------------------------------------------------------------
+// CompleteCheckExecution tests
+// ---------------------------------------------------------------------------
+
+func Test_CompleteCheckExecution_SetsStatus(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckResultUsecase(db, 10)
+
+	targetId, _ := happydns.NewRandomIdentifier()
+	ownerId, _ := happydns.NewRandomIdentifier()
+	resultId, _ := happydns.NewRandomIdentifier()
+
+	execution := &happydns.CheckExecution{
+		CheckerName: "checker",
+		OwnerId:     ownerId,
+		TargetType:  happydns.CheckScopeDomain,
+		TargetId:    targetId,
+		Status:      happydns.CheckExecutionRunning,
+		StartedAt:   time.Now().Add(-time.Second),
+	}
+	if err := uc.CreateCheckExecution(execution); err != nil {
+		t.Fatalf("failed to create execution: %v", err)
+	}
+
+	before := time.Now()
+	if err := uc.CompleteCheckExecution(execution.Id, resultId); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	after := time.Now()
+
+	updated, err := db.GetCheckExecution(execution.Id)
+	if err != nil {
+		t.Fatalf("failed to retrieve execution: %v", err)
+	}
+	if updated.Status != happydns.CheckExecutionCompleted {
+		t.Errorf("expected status Completed, got %v", updated.Status)
+	}
+	if updated.CompletedAt == nil {
+		t.Error("expected CompletedAt to be set")
+	} else if updated.CompletedAt.Before(before) || updated.CompletedAt.After(after) {
+		t.Errorf("CompletedAt %v not in expected range [%v, %v]", *updated.CompletedAt, before, after)
+	}
+	if updated.ResultId == nil || !updated.ResultId.Equals(resultId) {
+		t.Error("expected ResultId to be set to the provided resultId")
+	}
+}
+
+func Test_CompleteCheckExecution_NotFound(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckResultUsecase(db, 10)
+
+	nonExistentId, _ := happydns.NewRandomIdentifier()
+	resultId, _ := happydns.NewRandomIdentifier()
+
+	if err := uc.CompleteCheckExecution(nonExistentId, resultId); err == nil {
+		t.Fatal("expected error for non-existent execution ID")
+	}
+}
+
+// ---------------------------------------------------------------------------
+// FailCheckExecution tests
+// ---------------------------------------------------------------------------
+
+func Test_FailCheckExecution_CreatesErrorResult(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckResultUsecase(db, 10)
+
+	targetId, _ := happydns.NewRandomIdentifier()
+	ownerId, _ := happydns.NewRandomIdentifier()
+
+	execution := &happydns.CheckExecution{
+		CheckerName: "checker",
+		OwnerId:     ownerId,
+		TargetType:  happydns.CheckScopeDomain,
+		TargetId:    targetId,
+		Status:      happydns.CheckExecutionRunning,
+		StartedAt:   time.Now().Add(-time.Second),
+	}
+	if err := uc.CreateCheckExecution(execution); err != nil {
+		t.Fatalf("failed to create execution: %v", err)
+	}
+
+	if err := uc.FailCheckExecution(execution.Id, "something went wrong"); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	// Verify the check result was created.
+	results, err := db.ListCheckResults("checker", happydns.CheckScopeDomain, targetId, 0)
+	if err != nil {
+		t.Fatalf("failed to list results: %v", err)
+	}
+	if len(results) != 1 {
+		t.Fatalf("expected 1 check result to be created on failure, got %d", len(results))
+	}
+	result := results[0]
+	if result.Status != happydns.CheckResultStatusCritical {
+		t.Errorf("expected Status=KO, got %v", result.Status)
+	}
+	if result.Error != "something went wrong" {
+		t.Errorf("expected Error='something went wrong', got %q", result.Error)
+	}
+
+	// Verify the execution status was updated.
+	updated, err := db.GetCheckExecution(execution.Id)
+	if err != nil {
+		t.Fatalf("failed to retrieve execution: %v", err)
+	}
+	if updated.Status != happydns.CheckExecutionFailed {
+		t.Errorf("expected execution status Failed, got %v", updated.Status)
+	}
+}
+
+func Test_FailCheckExecution_ScheduledCheckFlag(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckResultUsecase(db, 10)
+
+	targetId, _ := happydns.NewRandomIdentifier()
+	ownerId, _ := happydns.NewRandomIdentifier()
+	scheduleId, _ := happydns.NewRandomIdentifier()
+
+	execution := &happydns.CheckExecution{
+		CheckerName: "checker",
+		OwnerId:     ownerId,
+		TargetType:  happydns.CheckScopeDomain,
+		TargetId:    targetId,
+		ScheduleId:  &scheduleId,
+		Status:      happydns.CheckExecutionRunning,
+		StartedAt:   time.Now().Add(-time.Second),
+	}
+	if err := uc.CreateCheckExecution(execution); err != nil {
+		t.Fatalf("failed to create execution: %v", err)
+	}
+
+	if err := uc.FailCheckExecution(execution.Id, "scheduled check failed"); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	results, err := db.ListCheckResults("checker", happydns.CheckScopeDomain, targetId, 0)
+	if err != nil {
+		t.Fatalf("failed to list results: %v", err)
+	}
+	if len(results) != 1 {
+		t.Fatalf("expected 1 result, got %d", len(results))
+	}
+	if !results[0].ScheduledCheck {
+		t.Error("expected ScheduledCheck=true when execution has a non-nil ScheduleId")
+	}
+}

internal/usecase/checkresult/checkschedule_usecase.go

@@ -0,0 +1,465 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package checkresult
+
+import (
+	"errors"
+	"fmt"
+	"math/rand"
+	"sort"
+	"time"
+
+	"git.happydns.org/happyDomain/model"
+)
+
+const (
+	// Default check intervals
+	DefaultUserCheckInterval    = 4 * time.Hour   // 4 hours for user checks
+	DefaultDomainCheckInterval  = 24 * time.Hour  // 24 hours for domain checks
+	DefaultServiceCheckInterval = 1 * time.Hour   // 1 hour for service checks
+	MinimumCheckInterval        = 5 * time.Minute // Minimum interval allowed
+)
+
+// CheckScheduleUsecase implements business logic for check schedules
+type CheckScheduleUsecase struct {
+	storage        CheckResultStorage
+	options        *happydns.Options
+	domainLister   DomainLister
+	checkerUsecase happydns.CheckerUsecase
+}
+
+// NewCheckScheduleUsecase creates a new check schedule usecase
+func NewCheckScheduleUsecase(storage CheckResultStorage, options *happydns.Options, domainLister DomainLister, checkerUsecase happydns.CheckerUsecase) *CheckScheduleUsecase {
+	return &CheckScheduleUsecase{
+		storage:        storage,
+		options:        options,
+		domainLister:   domainLister,
+		checkerUsecase: checkerUsecase,
+	}
+}
+
+// ListUserSchedules retrieves all schedules for a specific user
+func (u *CheckScheduleUsecase) ListUserSchedules(userId happydns.Identifier) ([]*happydns.CheckerSchedule, error) {
+	return u.storage.ListCheckerSchedulesByUser(userId)
+}
+
+// ListSchedulesByTarget retrieves all schedules for a specific target
+func (u *CheckScheduleUsecase) ListSchedulesByTarget(targetType happydns.CheckScopeType, targetId happydns.Identifier, insideType *happydns.CheckScopeType, insideId *happydns.Identifier) ([]*happydns.CheckerSchedule, error) {
+	return u.storage.ListCheckerSchedulesByTarget(targetType, targetId, insideType, insideId)
+}
+
+// GetSchedule retrieves a specific schedule by ID
+func (u *CheckScheduleUsecase) GetSchedule(scheduleId happydns.Identifier) (*happydns.CheckerSchedule, error) {
+	return u.storage.GetCheckerSchedule(scheduleId)
+}
+
+// CreateSchedule creates a new check schedule with validation
+func (u *CheckScheduleUsecase) CreateSchedule(schedule *happydns.CheckerSchedule) error {
+	// Set default interval if not specified
+	if schedule.Interval == 0 {
+		schedule.Interval = u.getDefaultInterval(schedule.CheckerName, schedule.TargetType)
+	}
+
+	// Validate interval against per-checker and global bounds
+	if err := u.validateInterval(schedule.CheckerName, &schedule.Interval); err != nil {
+		return err
+	}
+
+	// Validate interval
+	if schedule.Interval < MinimumCheckInterval {
+		return fmt.Errorf("check interval must be at least %v", MinimumCheckInterval)
+	}
+
+	// Calculate next run time: pick a random offset within the interval
+	// to spread load evenly across all schedules
+	// TODO: Use a smarter load balance function in the future
+	if schedule.NextRun.IsZero() {
+		offset := time.Duration(rand.Int63n(int64(schedule.Interval)))
+		schedule.NextRun = time.Now().Add(offset)
+	}
+
+	return u.storage.CreateCheckerSchedule(schedule)
+}
+
+// UpdateSchedule updates an existing schedule
+func (u *CheckScheduleUsecase) UpdateSchedule(schedule *happydns.CheckerSchedule) error {
+	// Validate interval against per-checker and global bounds
+	if err := u.validateInterval(schedule.CheckerName, &schedule.Interval); err != nil {
+		return err
+	}
+
+	// Get existing schedule to preserve certain fields
+	existing, err := u.storage.GetCheckerSchedule(schedule.Id)
+	if err != nil {
+		return err
+	}
+
+	// Preserve LastRun if not explicitly changed
+	if schedule.LastRun == nil {
+		schedule.LastRun = existing.LastRun
+	}
+
+	// Recalculate next run time if interval changed
+	if schedule.Interval != existing.Interval {
+		if schedule.LastRun != nil {
+			schedule.NextRun = schedule.LastRun.Add(schedule.Interval)
+		} else {
+			schedule.NextRun = time.Now().Add(schedule.Interval)
+		}
+	}
+
+	return u.storage.UpdateCheckerSchedule(schedule)
+}
+
+// DeleteSchedule removes a schedule
+func (u *CheckScheduleUsecase) DeleteSchedule(scheduleId happydns.Identifier) error {
+	return u.storage.DeleteCheckerSchedule(scheduleId)
+}
+
+// EnableSchedule enables a schedule
+func (u *CheckScheduleUsecase) EnableSchedule(scheduleId happydns.Identifier) error {
+	schedule, err := u.storage.GetCheckerSchedule(scheduleId)
+	if err != nil {
+		return err
+	}
+
+	schedule.Enabled = true
+
+	// Reset next run time if it's in the past
+	if schedule.NextRun.Before(time.Now()) {
+		schedule.NextRun = time.Now().Add(schedule.Interval)
+	}
+
+	return u.storage.UpdateCheckerSchedule(schedule)
+}
+
+// DisableSchedule disables a schedule
+func (u *CheckScheduleUsecase) DisableSchedule(scheduleId happydns.Identifier) error {
+	schedule, err := u.storage.GetCheckerSchedule(scheduleId)
+	if err != nil {
+		return err
+	}
+
+	schedule.Enabled = false
+	return u.storage.UpdateCheckerSchedule(schedule)
+}
+
+// UpdateScheduleAfterRun updates a schedule after it has been executed
+func (u *CheckScheduleUsecase) UpdateScheduleAfterRun(scheduleId happydns.Identifier) error {
+	schedule, err := u.storage.GetCheckerSchedule(scheduleId)
+	if err != nil {
+		return err
+	}
+
+	now := time.Now()
+	schedule.LastRun = &now
+	schedule.NextRun = now.Add(schedule.Interval)
+
+	return u.storage.UpdateCheckerSchedule(schedule)
+}
+
+// ListDueSchedules retrieves all enabled schedules that are due to run
+func (u *CheckScheduleUsecase) ListDueSchedules() ([]*happydns.CheckerSchedule, error) {
+	schedules, err := u.storage.ListEnabledCheckerSchedules()
+	if err != nil {
+		return nil, err
+	}
+
+	now := time.Now()
+	var dueSchedules []*happydns.CheckerSchedule
+
+	for _, schedule := range schedules {
+		if schedule.NextRun.Before(now) {
+			dueSchedules = append(dueSchedules, schedule)
+		}
+	}
+
+	return dueSchedules, nil
+}
+
+// ListUpcomingSchedules retrieves the next `limit` enabled schedules sorted by NextRun ascending
+func (u *CheckScheduleUsecase) ListUpcomingSchedules(limit int) ([]*happydns.CheckerSchedule, error) {
+	schedules, err := u.storage.ListEnabledCheckerSchedules()
+	if err != nil {
+		return nil, err
+	}
+
+	sort.Slice(schedules, func(i, j int) bool {
+		return schedules[i].NextRun.Before(schedules[j].NextRun)
+	})
+
+	if limit > 0 && len(schedules) > limit {
+		schedules = schedules[:limit]
+	}
+
+	return schedules, nil
+}
+
+// getDefaultInterval returns the default check interval. If the checker
+// implements CheckerIntervalProvider, its default is used; otherwise a
+// scope-based fallback is returned.
+func (u *CheckScheduleUsecase) getDefaultInterval(checkerName string, targetType happydns.CheckScopeType) time.Duration {
+	if spec := u.getCheckerIntervalSpec(checkerName); spec != nil {
+		return spec.Default
+	}
+
+	switch targetType {
+	case happydns.CheckScopeUser:
+		return DefaultUserCheckInterval
+	case happydns.CheckScopeDomain:
+		return DefaultDomainCheckInterval
+	case happydns.CheckScopeService:
+		return DefaultServiceCheckInterval
+	default:
+		return DefaultDomainCheckInterval
+	}
+}
+
+// validateInterval clamps the interval to per-checker bounds (if available)
+// and enforces the global MinimumCheckInterval as an absolute floor.
+func (u *CheckScheduleUsecase) validateInterval(checkerName string, interval *time.Duration) error {
+	if spec := u.getCheckerIntervalSpec(checkerName); spec != nil {
+		if *interval < spec.Min {
+			*interval = spec.Min
+		}
+		if *interval > spec.Max {
+			*interval = spec.Max
+		}
+	}
+
+	if *interval < MinimumCheckInterval {
+		return fmt.Errorf("check interval must be at least %v", MinimumCheckInterval)
+	}
+
+	return nil
+}
+
+// getCheckerIntervalSpec returns the CheckIntervalSpec for a checker if it
+// implements CheckerIntervalProvider, or nil otherwise.
+func (u *CheckScheduleUsecase) getCheckerIntervalSpec(checkerName string) *happydns.CheckIntervalSpec {
+	if u.checkerUsecase == nil {
+		return nil
+	}
+	checker, err := u.checkerUsecase.GetChecker(checkerName)
+	if err != nil {
+		return nil
+	}
+	ip, ok := checker.(happydns.CheckerIntervalProvider)
+	if !ok {
+		return nil
+	}
+	spec := ip.CheckInterval()
+	return &spec
+}
+
+// ValidateScheduleOwnership checks if a user owns a schedule
+func (u *CheckScheduleUsecase) ValidateScheduleOwnership(scheduleId happydns.Identifier, userId happydns.Identifier) error {
+	schedule, err := u.storage.GetCheckerSchedule(scheduleId)
+	if err != nil {
+		return err
+	}
+
+	if !schedule.OwnerId.Equals(userId) {
+		return fmt.Errorf("user does not own this schedule")
+	}
+
+	return nil
+}
+
+// CreateDefaultSchedulesForTarget creates default schedules for a new target
+func (u *CheckScheduleUsecase) CreateDefaultSchedulesForTarget(
+	checkerName string,
+	targetType happydns.CheckScopeType,
+	targetId happydns.Identifier,
+	insideType *happydns.CheckScopeType,
+	insideId *happydns.Identifier,
+	ownerId happydns.Identifier,
+	enabled bool,
+) error {
+	schedule := &happydns.CheckerSchedule{
+		CheckerName: checkerName,
+		OwnerId:     ownerId,
+		InsideType:  insideType,
+		InsideId:    insideId,
+		TargetType:  targetType,
+		TargetId:    targetId,
+		Interval:    u.getDefaultInterval(checkerName, targetType),
+		Enabled:     enabled,
+		NextRun:     time.Now().Add(u.getDefaultInterval(checkerName, targetType)),
+		Options:     make(happydns.CheckerOptions),
+	}
+
+	return u.CreateSchedule(schedule)
+}
+
+// rescheduleChecks reschedules each given schedule to a random time in [now, now+maxOffsetFn(schedule)].
+func (u *CheckScheduleUsecase) rescheduleChecks(schedules []*happydns.CheckerSchedule, maxOffsetFn func(*happydns.CheckerSchedule) time.Duration) (int, error) {
+	count := 0
+	now := time.Now()
+	for _, schedule := range schedules {
+		maxOffset := maxOffsetFn(schedule)
+		if maxOffset <= 0 {
+			maxOffset = time.Second
+		}
+		schedule.NextRun = now.Add(time.Duration(rand.Int63n(int64(maxOffset))))
+		if err := u.storage.UpdateCheckerSchedule(schedule); err != nil {
+			return count, err
+		}
+		count++
+	}
+	return count, nil
+}
+
+// RescheduleUpcomingChecks randomizes the next run time of all enabled schedules
+// within their respective intervals to spread load evenly. Useful after a restart.
+func (u *CheckScheduleUsecase) RescheduleUpcomingChecks() (int, error) {
+	schedules, err := u.storage.ListEnabledCheckerSchedules()
+	if err != nil {
+		return 0, err
+	}
+	return u.rescheduleChecks(schedules, func(s *happydns.CheckerSchedule) time.Duration {
+		return s.Interval
+	})
+}
+
+// RescheduleOverdueChecks reschedules checks whose NextRun is in the past,
+// spreading them over a short window to avoid scheduler famine (e.g. after
+// a long machine suspend or server downtime).
+// If there are fewer than 10 overdue checks, they are left as-is so that the
+// caller's immediate checkSchedules pass enqueues them directly.
+func (u *CheckScheduleUsecase) RescheduleOverdueChecks() (int, error) {
+	schedules, err := u.storage.ListEnabledCheckerSchedules()
+	if err != nil {
+		return 0, err
+	}
+
+	now := time.Now()
+	var overdue []*happydns.CheckerSchedule
+	for _, s := range schedules {
+		if s.NextRun.Before(now) {
+			overdue = append(overdue, s)
+		}
+	}
+
+	if len(overdue) == 0 {
+		return 0, nil
+	}
+
+	// Small backlog: let the caller enqueue them directly on the next
+	// checkSchedules pass rather than deferring them into the future.
+	if len(overdue) < 10 {
+		return 0, nil
+	}
+
+	// Spread overdue checks over a small window proportional to their count,
+	// capped at MinimumCheckInterval, to prevent all of them from running at once.
+	spreadWindow := time.Duration(len(overdue)) * 5 * time.Second
+	if spreadWindow > MinimumCheckInterval {
+		spreadWindow = MinimumCheckInterval
+	}
+
+	return u.rescheduleChecks(overdue, func(s *happydns.CheckerSchedule) time.Duration {
+		return spreadWindow
+	})
+}
+
+// DeleteSchedulesForTarget removes all schedules for a target
+func (u *CheckScheduleUsecase) DeleteSchedulesForTarget(targetType happydns.CheckScopeType, targetId happydns.Identifier, insideType *happydns.CheckScopeType, insideId *happydns.Identifier, ownerId happydns.Identifier) error {
+	schedules, err := u.storage.ListCheckerSchedulesByTarget(targetType, targetId, insideType, insideId)
+	if err != nil {
+		return err
+	}
+
+	for _, schedule := range schedules {
+		if !schedule.OwnerId.Equals(ownerId) {
+			continue
+		}
+		if err := u.storage.DeleteCheckerSchedule(schedule.Id); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// DiscoverAndEnsureSchedules creates default enabled schedules for all (plugin, domain)
+// pairs that don't yet have an explicit schedule record. This implements the opt-out
+// model: checks run automatically unless a schedule with Enabled=false has been saved.
+// Non-fatal per-domain errors are collected and returned together.
+func (u *CheckScheduleUsecase) DiscoverAndEnsureSchedules() error {
+	if u.domainLister == nil || u.checkerUsecase == nil {
+		return nil
+	}
+
+	plugins, err := u.checkerUsecase.ListCheckers()
+	if err != nil {
+		return fmt.Errorf("listing check plugins for discovery: %w", err)
+	}
+
+	iter, err := u.domainLister.ListAllDomains()
+	if err != nil {
+		return fmt.Errorf("listing domains for schedule discovery: %w", err)
+	}
+	defer iter.Close()
+
+	var errs []error
+	for iter.Next() {
+		domain := iter.Item()
+		if domain == nil {
+			continue
+		}
+		for checkerName, p := range *plugins {
+			if !p.Availability().ApplyToDomain {
+				continue
+			}
+
+			schedules, err := u.ListSchedulesByTarget(happydns.CheckScopeDomain, domain.Id, nil, nil)
+			if err != nil {
+				errs = append(errs, fmt.Errorf("listing schedules for domain %s: %w", domain.Id, err))
+				continue
+			}
+
+			hasSchedule := false
+			for _, sched := range schedules {
+				if sched.CheckerName == checkerName {
+					hasSchedule = true
+					break
+				}
+			}
+
+			if !hasSchedule {
+				if err := u.CreateSchedule(&happydns.CheckerSchedule{
+					CheckerName: checkerName,
+					OwnerId:     domain.Owner,
+					TargetType:  happydns.CheckScopeDomain,
+					TargetId:    domain.Id,
+					Enabled:     true,
+				}); err != nil {
+					errs = append(errs, fmt.Errorf("auto-creating schedule for domain %s / plugin %s: %w",
+						domain.Id, checkerName, err))
+				}
+			}
+		}
+	}
+
+	return errors.Join(errs...)
+}

internal/usecase/checkresult/checkschedule_usecase_test.go

@@ -0,0 +1,890 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package checkresult_test
+
+import (
+	"context"
+	"fmt"
+	"testing"
+	"time"
+
+	"git.happydns.org/happyDomain/internal/storage"
+	checkresultUC "git.happydns.org/happyDomain/internal/usecase/checkresult"
+	"git.happydns.org/happyDomain/model"
+)
+
+// ---------------------------------------------------------------------------
+// mockCheckerUsecase – minimal CheckerUsecase backed by a fixed map.
+// ---------------------------------------------------------------------------
+
+type mockCheckerUsecase struct {
+	checkers map[string]happydns.Checker
+}
+
+func (m *mockCheckerUsecase) ListCheckers() (*map[string]happydns.Checker, error) {
+	return &m.checkers, nil
+}
+
+func (m *mockCheckerUsecase) GetChecker(name string) (happydns.Checker, error) {
+	c, ok := m.checkers[name]
+	if !ok {
+		return nil, fmt.Errorf("checker not found: %s", name)
+	}
+	return c, nil
+}
+
+func (m *mockCheckerUsecase) GetCheckerOptions(name string, userid *happydns.Identifier, domainid *happydns.Identifier, serviceid *happydns.Identifier) (*happydns.CheckerOptions, error) {
+	return nil, nil
+}
+
+func (m *mockCheckerUsecase) BuildMergedCheckerOptions(name string, userid *happydns.Identifier, domainid *happydns.Identifier, serviceid *happydns.Identifier, runOpts happydns.CheckerOptions) (happydns.CheckerOptions, error) {
+	return runOpts, nil
+}
+
+func (m *mockCheckerUsecase) GetStoredCheckerOptionsNoDefault(name string, userid *happydns.Identifier, domainid *happydns.Identifier, serviceid *happydns.Identifier) (happydns.CheckerOptions, error) {
+	return make(happydns.CheckerOptions), nil
+}
+
+func (m *mockCheckerUsecase) SetCheckerOptions(name string, userid *happydns.Identifier, domainid *happydns.Identifier, serviceid *happydns.Identifier, opts happydns.CheckerOptions) error {
+	return nil
+}
+
+func (m *mockCheckerUsecase) OverwriteSomeCheckerOptions(name string, userid *happydns.Identifier, domainid *happydns.Identifier, serviceid *happydns.Identifier, opts happydns.CheckerOptions) error {
+	return nil
+}
+
+// ---------------------------------------------------------------------------
+// mockDomainChecker – Checker with configurable Availability.
+// ---------------------------------------------------------------------------
+
+type mockDomainChecker struct {
+	name         string
+	applyDomain  bool
+	applyService bool
+}
+
+func (m *mockDomainChecker) ID() string   { return m.name }
+func (m *mockDomainChecker) Name() string { return m.name }
+func (m *mockDomainChecker) Availability() happydns.CheckerAvailability {
+	return happydns.CheckerAvailability{ApplyToDomain: m.applyDomain, ApplyToService: m.applyService}
+}
+func (m *mockDomainChecker) Options() happydns.CheckerOptionsDocumentation {
+	return happydns.CheckerOptionsDocumentation{}
+}
+func (m *mockDomainChecker) RunCheck(_ context.Context, opts happydns.CheckerOptions, meta map[string]string) (*happydns.CheckResult, error) {
+	return nil, nil
+}
+
+// ---------------------------------------------------------------------------
+// Constructor helper
+// ---------------------------------------------------------------------------
+
+func newTestCheckScheduleUsecase(db storage.Storage, checkerUC happydns.CheckerUsecase) *checkresultUC.CheckScheduleUsecase {
+	return checkresultUC.NewCheckScheduleUsecase(db, &happydns.Options{}, db, checkerUC)
+}
+
+// seedSchedule creates and stores a schedule in the db, returning it with its assigned ID.
+func seedSchedule(t *testing.T, db storage.Storage, interval time.Duration) *happydns.CheckerSchedule {
+	t.Helper()
+	ownerId, _ := happydns.NewRandomIdentifier()
+	targetId, _ := happydns.NewRandomIdentifier()
+
+	s := &happydns.CheckerSchedule{
+		CheckerName: "checker",
+		OwnerId:     ownerId,
+		TargetType:  happydns.CheckScopeDomain,
+		TargetId:    targetId,
+		Interval:    interval,
+		Enabled:     true,
+		NextRun:     time.Now().Add(interval),
+	}
+	if err := db.CreateCheckerSchedule(s); err != nil {
+		t.Fatalf("failed to seed schedule: %v", err)
+	}
+	return s
+}
+
+// ---------------------------------------------------------------------------
+// CreateSchedule tests
+// ---------------------------------------------------------------------------
+
+func Test_CreateSchedule_DefaultInterval_Domain(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	ownerId, _ := happydns.NewRandomIdentifier()
+	targetId, _ := happydns.NewRandomIdentifier()
+
+	schedule := &happydns.CheckerSchedule{
+		CheckerName: "checker",
+		OwnerId:     ownerId,
+		TargetType:  happydns.CheckScopeDomain,
+		TargetId:    targetId,
+		Enabled:     true,
+	}
+
+	if err := uc.CreateSchedule(schedule); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if schedule.Interval != checkresultUC.DefaultDomainCheckInterval {
+		t.Errorf("expected default domain interval %v, got %v", checkresultUC.DefaultDomainCheckInterval, schedule.Interval)
+	}
+}
+
+func Test_CreateSchedule_DefaultInterval_Service(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	ownerId, _ := happydns.NewRandomIdentifier()
+	targetId, _ := happydns.NewRandomIdentifier()
+
+	schedule := &happydns.CheckerSchedule{
+		CheckerName: "checker",
+		OwnerId:     ownerId,
+		TargetType:  happydns.CheckScopeService,
+		TargetId:    targetId,
+		Enabled:     true,
+	}
+
+	if err := uc.CreateSchedule(schedule); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if schedule.Interval != checkresultUC.DefaultServiceCheckInterval {
+		t.Errorf("expected default service interval %v, got %v", checkresultUC.DefaultServiceCheckInterval, schedule.Interval)
+	}
+}
+
+func Test_CreateSchedule_MinimumIntervalRejected(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	ownerId, _ := happydns.NewRandomIdentifier()
+	targetId, _ := happydns.NewRandomIdentifier()
+
+	schedule := &happydns.CheckerSchedule{
+		CheckerName: "checker",
+		OwnerId:     ownerId,
+		TargetType:  happydns.CheckScopeDomain,
+		TargetId:    targetId,
+		Interval:    4 * time.Minute,
+		Enabled:     true,
+	}
+
+	if err := uc.CreateSchedule(schedule); err == nil {
+		t.Fatal("expected error for interval below minimum (4 minutes)")
+	}
+}
+
+func Test_CreateSchedule_ExactMinimumAccepted(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	ownerId, _ := happydns.NewRandomIdentifier()
+	targetId, _ := happydns.NewRandomIdentifier()
+
+	schedule := &happydns.CheckerSchedule{
+		CheckerName: "checker",
+		OwnerId:     ownerId,
+		TargetType:  happydns.CheckScopeDomain,
+		TargetId:    targetId,
+		Interval:    checkresultUC.MinimumCheckInterval,
+		Enabled:     true,
+	}
+
+	if err := uc.CreateSchedule(schedule); err != nil {
+		t.Errorf("expected no error for exactly minimum interval, got: %v", err)
+	}
+}
+
+func Test_CreateSchedule_NextRunSetWhenZero(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	ownerId, _ := happydns.NewRandomIdentifier()
+	targetId, _ := happydns.NewRandomIdentifier()
+	interval := 30 * time.Minute
+
+	schedule := &happydns.CheckerSchedule{
+		CheckerName: "checker",
+		OwnerId:     ownerId,
+		TargetType:  happydns.CheckScopeDomain,
+		TargetId:    targetId,
+		Interval:    interval,
+		Enabled:     true,
+	}
+
+	before := time.Now()
+	if err := uc.CreateSchedule(schedule); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	if schedule.NextRun.IsZero() {
+		t.Fatal("expected NextRun to be set")
+	}
+	// NextRun = now + rand(0, interval), so NextRun is in [before, before+interval).
+	if schedule.NextRun.Before(before) || schedule.NextRun.After(before.Add(interval)) {
+		t.Errorf("NextRun %v not in expected range [%v, %v+interval]", schedule.NextRun, before, before)
+	}
+}
+
+func Test_CreateSchedule_NextRunPreserved(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	ownerId, _ := happydns.NewRandomIdentifier()
+	targetId, _ := happydns.NewRandomIdentifier()
+	specificNextRun := time.Now().Add(3 * time.Hour)
+
+	schedule := &happydns.CheckerSchedule{
+		CheckerName: "checker",
+		OwnerId:     ownerId,
+		TargetType:  happydns.CheckScopeDomain,
+		TargetId:    targetId,
+		Interval:    30 * time.Minute,
+		Enabled:     true,
+		NextRun:     specificNextRun,
+	}
+
+	if err := uc.CreateSchedule(schedule); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if !schedule.NextRun.Equal(specificNextRun) {
+		t.Errorf("expected NextRun to be preserved as %v, got %v", specificNextRun, schedule.NextRun)
+	}
+}
+
+// ---------------------------------------------------------------------------
+// UpdateSchedule tests
+// ---------------------------------------------------------------------------
+
+func Test_UpdateSchedule_PreservesLastRun(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	existing := seedSchedule(t, db, time.Hour)
+	lastRun := time.Now().Add(-30 * time.Minute)
+	existing.LastRun = &lastRun
+	// Store LastRun into the db.
+	if err := db.UpdateCheckerSchedule(existing); err != nil {
+		t.Fatalf("failed to persist LastRun: %v", err)
+	}
+
+	// Update without setting LastRun → should be preserved from existing.
+	update := *existing
+	update.LastRun = nil
+
+	if err := uc.UpdateSchedule(&update); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	stored, err := db.GetCheckerSchedule(existing.Id)
+	if err != nil {
+		t.Fatalf("failed to retrieve schedule: %v", err)
+	}
+	if stored.LastRun == nil {
+		t.Error("expected LastRun to be preserved from existing schedule")
+	} else if !stored.LastRun.Equal(lastRun) {
+		t.Errorf("expected LastRun %v, got %v", lastRun, *stored.LastRun)
+	}
+}
+
+func Test_UpdateSchedule_RecalculatesNextRun(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	existing := seedSchedule(t, db, time.Hour)
+	lastRun := time.Now().Add(-20 * time.Minute)
+	existing.LastRun = &lastRun
+	if err := db.UpdateCheckerSchedule(existing); err != nil {
+		t.Fatalf("failed to persist LastRun: %v", err)
+	}
+
+	newInterval := 2 * time.Hour
+	update := *existing
+	update.Interval = newInterval
+
+	if err := uc.UpdateSchedule(&update); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	stored, err := db.GetCheckerSchedule(existing.Id)
+	if err != nil {
+		t.Fatalf("failed to retrieve schedule: %v", err)
+	}
+	expectedNextRun := lastRun.Add(newInterval)
+	if !stored.NextRun.Equal(expectedNextRun) {
+		t.Errorf("expected NextRun=%v (LastRun+newInterval), got %v", expectedNextRun, stored.NextRun)
+	}
+}
+
+func Test_UpdateSchedule_NextRunFromNowWhenNoLastRun(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	existing := seedSchedule(t, db, time.Hour)
+	// Ensure no LastRun in stored version.
+	existing.LastRun = nil
+	if err := db.UpdateCheckerSchedule(existing); err != nil {
+		t.Fatalf("failed to persist cleared LastRun: %v", err)
+	}
+
+	newInterval := 2 * time.Hour
+	update := *existing
+	update.Interval = newInterval
+
+	before := time.Now()
+	if err := uc.UpdateSchedule(&update); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	after := time.Now()
+
+	stored, err := db.GetCheckerSchedule(existing.Id)
+	if err != nil {
+		t.Fatalf("failed to retrieve schedule: %v", err)
+	}
+	lowerBound := before.Add(newInterval)
+	upperBound := after.Add(newInterval)
+	if stored.NextRun.Before(lowerBound) || stored.NextRun.After(upperBound) {
+		t.Errorf("expected NextRun in [%v, %v], got %v", lowerBound, upperBound, stored.NextRun)
+	}
+}
+
+func Test_UpdateSchedule_MinimumIntervalRejected(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	existing := seedSchedule(t, db, time.Hour)
+	update := *existing
+	update.Interval = 2 * time.Minute
+
+	if err := uc.UpdateSchedule(&update); err == nil {
+		t.Fatal("expected error for interval below minimum")
+	}
+}
+
+// ---------------------------------------------------------------------------
+// EnableSchedule / DisableSchedule tests
+// ---------------------------------------------------------------------------
+
+func Test_EnableSchedule_SetsEnabled(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	existing := seedSchedule(t, db, time.Hour)
+	existing.Enabled = false
+	existing.NextRun = time.Now().Add(time.Hour) // future, no reset needed
+	if err := db.UpdateCheckerSchedule(existing); err != nil {
+		t.Fatalf("failed to persist disabled schedule: %v", err)
+	}
+
+	if err := uc.EnableSchedule(existing.Id); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	stored, err := db.GetCheckerSchedule(existing.Id)
+	if err != nil {
+		t.Fatalf("failed to retrieve schedule: %v", err)
+	}
+	if !stored.Enabled {
+		t.Error("expected Enabled=true after EnableSchedule")
+	}
+}
+
+func Test_EnableSchedule_ResetsNextRunIfPast(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	existing := seedSchedule(t, db, time.Hour)
+	existing.Enabled = false
+	existing.NextRun = time.Now().Add(-time.Hour) // in the past
+	if err := db.UpdateCheckerSchedule(existing); err != nil {
+		t.Fatalf("failed to persist past NextRun: %v", err)
+	}
+
+	before := time.Now()
+	if err := uc.EnableSchedule(existing.Id); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	after := time.Now()
+
+	stored, err := db.GetCheckerSchedule(existing.Id)
+	if err != nil {
+		t.Fatalf("failed to retrieve schedule: %v", err)
+	}
+	lowerBound := before.Add(existing.Interval)
+	upperBound := after.Add(existing.Interval)
+	if stored.NextRun.Before(lowerBound) || stored.NextRun.After(upperBound) {
+		t.Errorf("expected NextRun in [%v, %v] after enable, got %v", lowerBound, upperBound, stored.NextRun)
+	}
+}
+
+func Test_DisableSchedule_SetsDisabled(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	existing := seedSchedule(t, db, time.Hour)
+	// It's already Enabled=true from seedSchedule.
+
+	if err := uc.DisableSchedule(existing.Id); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	stored, err := db.GetCheckerSchedule(existing.Id)
+	if err != nil {
+		t.Fatalf("failed to retrieve schedule: %v", err)
+	}
+	if stored.Enabled {
+		t.Error("expected Enabled=false after DisableSchedule")
+	}
+}
+
+// ---------------------------------------------------------------------------
+// ListDueSchedules tests
+// ---------------------------------------------------------------------------
+
+func Test_ListDueSchedules_FiltersDisabledAndFuture(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	ownerId, _ := happydns.NewRandomIdentifier()
+	targetId, _ := happydns.NewRandomIdentifier()
+
+	pastTime := time.Now().Add(-time.Minute)
+	futureTime := time.Now().Add(time.Hour)
+
+	makeAndStore := func(enabled bool, nextRun time.Time) *happydns.CheckerSchedule {
+		s := &happydns.CheckerSchedule{
+			CheckerName: "checker",
+			OwnerId:     ownerId,
+			TargetType:  happydns.CheckScopeDomain,
+			TargetId:    targetId,
+			Interval:    time.Hour,
+			Enabled:     enabled,
+			NextRun:     nextRun,
+		}
+		if err := db.CreateCheckerSchedule(s); err != nil {
+			t.Fatalf("failed to create schedule: %v", err)
+		}
+		return s
+	}
+
+	enabledDue := makeAndStore(true, pastTime)
+	_ = makeAndStore(false, pastTime)    // disabled + past → not returned
+	_ = makeAndStore(true, futureTime)   // enabled + future → not returned
+
+	due, err := uc.ListDueSchedules()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(due) != 1 {
+		t.Errorf("expected 1 due schedule, got %d", len(due))
+	}
+	if len(due) > 0 && !due[0].Id.Equals(enabledDue.Id) {
+		t.Errorf("expected the enabled+past schedule to be returned")
+	}
+}
+
+func Test_ListDueSchedules_Empty(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	due, err := uc.ListDueSchedules()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(due) != 0 {
+		t.Errorf("expected 0 due schedules, got %d", len(due))
+	}
+}
+
+// ---------------------------------------------------------------------------
+// ListUpcomingSchedules tests
+// ---------------------------------------------------------------------------
+
+func Test_ListUpcomingSchedules_SortedAscending(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	ownerId, _ := happydns.NewRandomIdentifier()
+	targetId, _ := happydns.NewRandomIdentifier()
+	now := time.Now()
+
+	// Insert in reverse order (far future first) to ensure sorting is needed.
+	for i := 3; i >= 1; i-- {
+		s := &happydns.CheckerSchedule{
+			CheckerName: "checker",
+			OwnerId:     ownerId,
+			TargetType:  happydns.CheckScopeDomain,
+			TargetId:    targetId,
+			Interval:    time.Hour,
+			Enabled:     true,
+			NextRun:     now.Add(time.Duration(i) * time.Hour),
+		}
+		if err := db.CreateCheckerSchedule(s); err != nil {
+			t.Fatalf("failed to create schedule: %v", err)
+		}
+	}
+
+	upcoming, err := uc.ListUpcomingSchedules(0)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	for i := 1; i < len(upcoming); i++ {
+		if upcoming[i].NextRun.Before(upcoming[i-1].NextRun) {
+			t.Errorf("schedules not in ascending order at index %d: %v > %v",
+				i, upcoming[i-1].NextRun, upcoming[i].NextRun)
+		}
+	}
+}
+
+func Test_ListUpcomingSchedules_LimitApplied(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	ownerId, _ := happydns.NewRandomIdentifier()
+	targetId, _ := happydns.NewRandomIdentifier()
+	now := time.Now()
+
+	for i := range 5 {
+		s := &happydns.CheckerSchedule{
+			CheckerName: "checker",
+			OwnerId:     ownerId,
+			TargetType:  happydns.CheckScopeDomain,
+			TargetId:    targetId,
+			Interval:    time.Hour,
+			Enabled:     true,
+			NextRun:     now.Add(time.Duration(i) * time.Hour),
+		}
+		if err := db.CreateCheckerSchedule(s); err != nil {
+			t.Fatalf("failed to create schedule: %v", err)
+		}
+	}
+
+	upcoming, err := uc.ListUpcomingSchedules(3)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(upcoming) != 3 {
+		t.Errorf("expected 3 schedules with limit=3, got %d", len(upcoming))
+	}
+}
+
+// ---------------------------------------------------------------------------
+// ValidateScheduleOwnership tests
+// ---------------------------------------------------------------------------
+
+func Test_ValidateScheduleOwnership_Match(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	existing := seedSchedule(t, db, time.Hour)
+
+	if err := uc.ValidateScheduleOwnership(existing.Id, existing.OwnerId); err != nil {
+		t.Errorf("expected no error for matching owner, got: %v", err)
+	}
+}
+
+func Test_ValidateScheduleOwnership_Mismatch(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	existing := seedSchedule(t, db, time.Hour)
+	wrongUserId, _ := happydns.NewRandomIdentifier()
+
+	if err := uc.ValidateScheduleOwnership(existing.Id, wrongUserId); err == nil {
+		t.Fatal("expected error for wrong owner")
+	}
+}
+
+// ---------------------------------------------------------------------------
+// RescheduleOverdueChecks tests
+// ---------------------------------------------------------------------------
+
+func createOverdueSchedules(t *testing.T, db storage.Storage, n int) []*happydns.CheckerSchedule {
+	t.Helper()
+	ownerId, _ := happydns.NewRandomIdentifier()
+	targetId, _ := happydns.NewRandomIdentifier()
+	pastTime := time.Now().Add(-2 * time.Hour)
+
+	schedules := make([]*happydns.CheckerSchedule, n)
+	for i := range n {
+		s := &happydns.CheckerSchedule{
+			CheckerName: "checker",
+			OwnerId:     ownerId,
+			TargetType:  happydns.CheckScopeDomain,
+			TargetId:    targetId,
+			Interval:    time.Hour,
+			Enabled:     true,
+			NextRun:     pastTime,
+		}
+		if err := db.CreateCheckerSchedule(s); err != nil {
+			t.Fatalf("failed to create overdue schedule: %v", err)
+		}
+		schedules[i] = s
+	}
+	return schedules
+}
+
+func Test_RescheduleOverdueChecks_FewOverdue_NoChange(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	schedules := createOverdueSchedules(t, db, 5)
+	originalNextRuns := make([]time.Time, len(schedules))
+	for i, s := range schedules {
+		originalNextRuns[i] = s.NextRun
+	}
+
+	count, err := uc.RescheduleOverdueChecks()
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if count != 0 {
+		t.Errorf("expected count=0 for fewer than 10 overdue schedules, got %d", count)
+	}
+
+	// NextRun should not have changed.
+	for i, s := range schedules {
+		stored, err := db.GetCheckerSchedule(s.Id)
+		if err != nil {
+			t.Fatalf("failed to retrieve schedule: %v", err)
+		}
+		if !stored.NextRun.Equal(originalNextRuns[i]) {
+			t.Errorf("schedule[%d] NextRun changed when it should not have", i)
+		}
+	}
+}
+
+func Test_RescheduleOverdueChecks_ManyOverdue_Rescheduled(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	schedules := createOverdueSchedules(t, db, 15)
+
+	before := time.Now()
+	count, err := uc.RescheduleOverdueChecks()
+	after := time.Now()
+
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if count != 15 {
+		t.Errorf("expected count=15, got %d", count)
+	}
+
+	// All schedules should now have NextRun in [before, before+MinimumCheckInterval].
+	for i, s := range schedules {
+		stored, err := db.GetCheckerSchedule(s.Id)
+		if err != nil {
+			t.Fatalf("failed to retrieve schedule[%d]: %v", i, err)
+		}
+		if !stored.NextRun.After(before) {
+			t.Errorf("schedule[%d] NextRun %v should be after %v", i, stored.NextRun, before)
+		}
+		upperBound := after.Add(checkresultUC.MinimumCheckInterval)
+		if stored.NextRun.After(upperBound) {
+			t.Errorf("schedule[%d] NextRun %v should not exceed %v", i, stored.NextRun, upperBound)
+		}
+	}
+}
+
+func Test_RescheduleOverdueChecks_FutureSchedulesIgnored(t *testing.T) {
+	db := newTestDB(t)
+	uc := newTestCheckScheduleUsecase(db, nil)
+
+	overdue := createOverdueSchedules(t, db, 15)
+	_ = overdue // created in db
+
+	// Add 3 future enabled schedules.
+	ownerId, _ := happydns.NewRandomIdentifier()
+	targetId, _ := happydns.NewRandomIdentifier()
+	futureTime := time.Now().Add(2 * time.Hour)
+	var futureSchedules []*happydns.CheckerSchedule
+	for range 3 {
+		s := &happydns.CheckerSchedule{
+			CheckerName: "checker",
+			OwnerId:     ownerId,
+			TargetType:  happydns.CheckScopeDomain,
+			TargetId:    targetId,
+			Interval:    time.Hour,
+			Enabled:     true,
+			NextRun:     futureTime,
+		}
+		if err := db.CreateCheckerSchedule(s); err != nil {
+			t.Fatalf("failed to create future schedule: %v", err)
+		}
+		futureSchedules = append(futureSchedules, s)
+	}
+
+	if _, err := uc.RescheduleOverdueChecks(); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	// Future schedules should retain their original NextRun.
+	for i, s := range futureSchedules {
+		stored, err := db.GetCheckerSchedule(s.Id)
+		if err != nil {
+			t.Fatalf("failed to retrieve future schedule[%d]: %v", i, err)
+		}
+		if !stored.NextRun.Equal(futureTime) {
+			t.Errorf("future schedule[%d] NextRun changed from %v to %v", i, futureTime, stored.NextRun)
+		}
+	}
+}
+
+// ---------------------------------------------------------------------------
+// DiscoverAndEnsureSchedules tests
+// ---------------------------------------------------------------------------
+
+func createDomain(t *testing.T, db storage.Storage, name string) *happydns.Domain {
+	t.Helper()
+	ownerId, _ := happydns.NewRandomIdentifier()
+	domain := &happydns.Domain{
+		Owner:      ownerId,
+		DomainName: name,
+	}
+	if err := db.CreateDomain(domain); err != nil {
+		t.Fatalf("failed to create domain %s: %v", name, err)
+	}
+	return domain
+}
+
+func Test_DiscoverAndEnsureSchedules_CreatesForMissingPlugin(t *testing.T) {
+	db := newTestDB(t)
+	domain := createDomain(t, db, "example.com.")
+	checkerUC := &mockCheckerUsecase{
+		checkers: map[string]happydns.Checker{
+			"domain-checker": &mockDomainChecker{name: "domain-checker", applyDomain: true},
+		},
+	}
+	uc := newTestCheckScheduleUsecase(db, checkerUC)
+
+	if err := uc.DiscoverAndEnsureSchedules(); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	schedules, err := db.ListCheckerSchedulesByTarget(happydns.CheckScopeDomain, domain.Id, nil, nil)
+	if err != nil {
+		t.Fatalf("failed to list schedules: %v", err)
+	}
+	if len(schedules) != 1 {
+		t.Errorf("expected 1 schedule created, got %d", len(schedules))
+	}
+}
+
+func Test_DiscoverAndEnsureSchedules_SkipsExistingSchedule(t *testing.T) {
+	db := newTestDB(t)
+	domain := createDomain(t, db, "example.com.")
+	checkerUC := &mockCheckerUsecase{
+		checkers: map[string]happydns.Checker{
+			"domain-checker": &mockDomainChecker{name: "domain-checker", applyDomain: true},
+		},
+	}
+
+	// Pre-seed a schedule for this domain + checker.
+	pre := &happydns.CheckerSchedule{
+		CheckerName: "domain-checker",
+		OwnerId:     domain.Owner,
+		TargetType:  happydns.CheckScopeDomain,
+		TargetId:    domain.Id,
+		Interval:    24 * time.Hour,
+		Enabled:     true,
+		NextRun:     time.Now().Add(time.Hour),
+	}
+	if err := db.CreateCheckerSchedule(pre); err != nil {
+		t.Fatalf("failed to seed schedule: %v", err)
+	}
+
+	uc := newTestCheckScheduleUsecase(db, checkerUC)
+	if err := uc.DiscoverAndEnsureSchedules(); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	schedules, err := db.ListCheckerSchedulesByTarget(happydns.CheckScopeDomain, domain.Id, nil, nil)
+	if err != nil {
+		t.Fatalf("failed to list schedules: %v", err)
+	}
+	if len(schedules) != 1 {
+		t.Errorf("expected 1 schedule (no duplicate), got %d", len(schedules))
+	}
+}
+
+func Test_DiscoverAndEnsureSchedules_SkipsServiceOnlyChecker(t *testing.T) {
+	db := newTestDB(t)
+	domain := createDomain(t, db, "example.com.")
+	checkerUC := &mockCheckerUsecase{
+		checkers: map[string]happydns.Checker{
+			"service-only": &mockDomainChecker{name: "service-only", applyDomain: false, applyService: true},
+		},
+	}
+	uc := newTestCheckScheduleUsecase(db, checkerUC)
+
+	if err := uc.DiscoverAndEnsureSchedules(); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	schedules, err := db.ListCheckerSchedulesByTarget(happydns.CheckScopeDomain, domain.Id, nil, nil)
+	if err != nil {
+		t.Fatalf("failed to list schedules: %v", err)
+	}
+	if len(schedules) != 0 {
+		t.Errorf("expected 0 schedules for service-only checker, got %d", len(schedules))
+	}
+}
+
+func Test_DiscoverAndEnsureSchedules_NilDependencies(t *testing.T) {
+	db := newTestDB(t)
+	// Both domainLister and checkerUsecase are nil → returns nil, no panic.
+	uc := checkresultUC.NewCheckScheduleUsecase(db, &happydns.Options{}, nil, nil)
+
+	if err := uc.DiscoverAndEnsureSchedules(); err != nil {
+		t.Errorf("expected nil error for nil dependencies, got: %v", err)
+	}
+}
+
+func Test_DiscoverAndEnsureSchedules_MultipleDomains(t *testing.T) {
+	db := newTestDB(t)
+	createDomain(t, db, "alpha.com.")
+	createDomain(t, db, "beta.com.")
+	createDomain(t, db, "gamma.com.")
+
+	checkerUC := &mockCheckerUsecase{
+		checkers: map[string]happydns.Checker{
+			"checker-1": &mockDomainChecker{name: "checker-1", applyDomain: true},
+			"checker-2": &mockDomainChecker{name: "checker-2", applyDomain: true},
+		},
+	}
+	uc := newTestCheckScheduleUsecase(db, checkerUC)
+
+	if err := uc.DiscoverAndEnsureSchedules(); err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+
+	// 3 domains × 2 checkers = 6 schedules.
+	enabled, err := db.ListEnabledCheckerSchedules()
+	if err != nil {
+		t.Fatalf("failed to list schedules: %v", err)
+	}
+	if len(enabled) != 6 {
+		t.Errorf("expected 6 schedules (3 domains × 2 checkers), got %d", len(enabled))
+	}
+}

internal/usecase/checkresult/storage.go

@@ -0,0 +1,103 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package checkresult
+
+import (
+	"time"
+
+	"git.happydns.org/happyDomain/model"
+)
+
+// CheckResultStorage defines the storage interface for check results and related data
+type CheckResultStorage interface {
+	// Check Results
+	// ListCheckResults retrieves check results for a specific plugin+target combination
+	ListCheckResults(checkName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, limit int) ([]*happydns.CheckResult, error)
+
+	// ListCheckResultsByPlugin retrieves all check results for a plugin across all targets for a user
+	ListCheckResultsByPlugin(userId happydns.Identifier, checkName string, limit int) ([]*happydns.CheckResult, error)
+
+	// ListCheckResultsByUser retrieves all check results for a user
+	ListCheckResultsByUser(userId happydns.Identifier, limit int) ([]*happydns.CheckResult, error)
+
+	// GetCheckResult retrieves a specific check result by its ID
+	GetCheckResult(checkName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, resultId happydns.Identifier) (*happydns.CheckResult, error)
+
+	// CreateCheckResult stores a new check result
+	CreateCheckResult(result *happydns.CheckResult) error
+
+	// DeleteCheckResult removes a specific check result
+	DeleteCheckResult(checkName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, resultId happydns.Identifier) error
+
+	// DeleteOldCheckResults removes old check results keeping only the most recent N results
+	DeleteOldCheckResults(checkName string, targetType happydns.CheckScopeType, targetId happydns.Identifier, keepCount int) error
+
+	// Checker Schedules
+	// ListEnabledCheckerSchedules retrieves all enabled schedules (for scheduler)
+	ListEnabledCheckerSchedules() ([]*happydns.CheckerSchedule, error)
+
+	// ListCheckerSchedulesByUser retrieves all schedules for a specific user
+	ListCheckerSchedulesByUser(userId happydns.Identifier) ([]*happydns.CheckerSchedule, error)
+
+	// ListCheckerSchedulesByTarget retrieves all schedules for a specific target
+	ListCheckerSchedulesByTarget(targetType happydns.CheckScopeType, targetId happydns.Identifier, insideType *happydns.CheckScopeType, insideId *happydns.Identifier) ([]*happydns.CheckerSchedule, error)
+
+	// GetCheckerSchedule retrieves a specific schedule by ID
+	GetCheckerSchedule(scheduleId happydns.Identifier) (*happydns.CheckerSchedule, error)
+
+	// CreateCheckerSchedule creates a new check schedule
+	CreateCheckerSchedule(schedule *happydns.CheckerSchedule) error
+
+	// UpdateCheckerSchedule updates an existing schedule
+	UpdateCheckerSchedule(schedule *happydns.CheckerSchedule) error
+
+	// DeleteCheckerSchedule removes a schedule
+	DeleteCheckerSchedule(scheduleId happydns.Identifier) error
+
+	// Check Executions
+	// ListActiveCheckExecutions retrieves all executions that are pending or running
+	ListActiveCheckExecutions() ([]*happydns.CheckExecution, error)
+
+	// GetCheckExecution retrieves a specific execution by ID
+	GetCheckExecution(executionId happydns.Identifier) (*happydns.CheckExecution, error)
+
+	// CreateCheckExecution creates a new check execution record
+	CreateCheckExecution(execution *happydns.CheckExecution) error
+
+	// UpdateCheckExecution updates an existing execution record
+	UpdateCheckExecution(execution *happydns.CheckExecution) error
+
+	// DeleteCheckExecution removes an execution record
+	DeleteCheckExecution(executionId happydns.Identifier) error
+
+	// Scheduler State
+	// CheckSchedulerRun marks that the scheduler has run at current time
+	CheckSchedulerRun() error
+
+	// LastCheckSchedulerRun retrieves the last time the scheduler ran
+	LastCheckSchedulerRun() (*time.Time, error)
+}
+
+// DomainLister provides access to domain listings for schedule discovery.
+type DomainLister interface {
+	ListAllDomains() (happydns.Iterator[happydns.Domain], error)
+}

internal/usecase/domain_info_usecase.go

@@ -0,0 +1,62 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2025 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package usecase
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+
+	"git.happydns.org/happyDomain/model"
+)
+
+type domainInfoUsecase struct {
+	getters []happydns.DomainInfoGetter
+}
+
+func NewDomainInfoUsecase(getters ...happydns.DomainInfoGetter) happydns.DomainInfoUsecase {
+	return &domainInfoUsecase{getters: getters}
+}
+
+func (diu *domainInfoUsecase) GetDomainInfo(ctx context.Context, fqdn happydns.Origin) (*happydns.DomainInfo, error) {
+	domain := happydns.Origin(strings.TrimSuffix(string(fqdn), "."))
+
+	var lastErr error
+	for _, getter := range diu.getters {
+		infos, err := getter(ctx, domain)
+		if err != nil {
+			if errors.Is(err, happydns.DomainDoesNotExist) {
+				return nil, err
+			}
+			lastErr = err
+			continue
+		}
+		if infos == nil {
+			lastErr = fmt.Errorf("no information found")
+			continue
+		}
+		return infos, nil
+	}
+
+	return nil, fmt.Errorf("unable to retrieve RDAP/WHOIS info about the domain name: %w", lastErr)
+}

model/check_result.go

@@ -0,0 +1,226 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package happydns
+
+import (
+	"time"
+)
+
+// CheckScopeType represents the scope level at which a check is performed
+type CheckScopeType int
+
+const (
+	CheckScopeInstance CheckScopeType = iota
+	CheckScopeUser
+	CheckScopeDomain
+	CheckScopeZone
+	CheckScopeService
+	CheckScopeOnDemand
+)
+
+// String returns a string representation of the check scope type
+func (t CheckScopeType) String() string {
+	switch t {
+	case CheckScopeInstance:
+		return "instance"
+	case CheckScopeUser:
+		return "user"
+	case CheckScopeDomain:
+		return "domain"
+	case CheckScopeService:
+		return "service"
+	case CheckScopeOnDemand:
+		return "ondemand"
+	default:
+		return "unknown"
+	}
+}
+
+// CheckExecutionStatus represents the current state of a check execution
+type CheckExecutionStatus int
+
+const (
+	CheckExecutionPending CheckExecutionStatus = iota
+	CheckExecutionRunning
+	CheckExecutionCompleted
+	CheckExecutionFailed
+)
+
+// String returns a string representation of the check execution status
+func (t CheckExecutionStatus) String() string {
+	switch t {
+	case CheckExecutionPending:
+		return "pending"
+	case CheckExecutionRunning:
+		return "running"
+	case CheckExecutionCompleted:
+		return "completed"
+	case CheckExecutionFailed:
+		return "failed"
+	default:
+		return "unknown"
+	}
+}
+
+// CheckResult stores the result of a check execution
+type CheckResult struct {
+	// Id is the unique identifier for this check result
+	Id Identifier `json:"id" swaggertype:"string"`
+
+	// CheckerName identifies which checker was executed
+	CheckerName string `json:"checker_name"`
+
+	// CheckType indicates the scope level of the check
+	CheckType CheckScopeType `json:"check_type"`
+
+	// TargetId is the identifier of the target (User/Domain/Service)
+	TargetId Identifier `json:"target_id" swaggertype:"string"`
+
+	// InsideType indicates the scope level of the parent target
+	InsideType *CheckScopeType `json:"check_type"`
+
+	// InsideId is the identifier of the parent target (User/Domain)
+	InsideId *Identifier `json:"inside_id" swaggertype:"string"`
+
+	// OwnerId is the owner of the check
+	OwnerId Identifier `json:"owner_id" swaggertype:"string"`
+
+	// ExecutedAt is when the check was executed
+	ExecutedAt time.Time `json:"executed_at"`
+
+	// ScheduledCheck indicates if this was a scheduled (true) or on-demand (false) check
+	ScheduledCheck bool `json:"scheduled_check"`
+
+	// Options contains the merged checker configuration used for this check
+	Options CheckerOptions `json:"options,omitempty"`
+
+	// Status is the overall check result status
+	Status CheckResultStatus `json:"status"`
+
+	// StatusLine is a summary message of the check result
+	StatusLine string `json:"status_line"`
+
+	// Report contains the full check report (checker-specific structure)
+	Report any `json:"report,omitempty"`
+
+	// Duration is how long the check took to execute
+	Duration time.Duration `json:"duration" swaggertype:"integer"`
+
+	// Error contains any error message if the execution failed
+	Error string `json:"error,omitempty"`
+}
+
+// CheckExecution tracks an in-progress or completed check execution
+type CheckExecution struct {
+	// Id is the unique identifier for this execution
+	Id Identifier `json:"id" swaggertype:"string"`
+
+	// ScheduleId is the schedule that triggered this execution (nil for on-demand)
+	ScheduleId *Identifier `json:"schedule_id,omitempty" swaggertype:"string"`
+
+	// CheckerName identifies which checker is being executed
+	CheckerName string `json:"checker_name"`
+
+	// OwnerId is the owner of the check
+	OwnerId Identifier `json:"owner_id" swaggertype:"string"`
+
+	// InsideType indicates the scope level of the parent target
+	InsideType *CheckScopeType `json:"check_type"`
+
+	// InsideId is the identifier of the parent target (User/Domain)
+	InsideId *Identifier `json:"inside_id" swaggertype:"string"`
+
+	// TargetType indicates the scope level of the check
+	TargetType CheckScopeType `json:"target_type"`
+
+	// TargetId is the identifier of the target being checked
+	TargetId Identifier `json:"target_id" swaggertype:"string"`
+
+	// Status is the current execution status
+	Status CheckExecutionStatus `json:"status"`
+
+	// StartedAt is when the execution began
+	StartedAt time.Time `json:"started_at"`
+
+	// CompletedAt is when the execution finished (nil if still running)
+	CompletedAt *time.Time `json:"completed_at,omitempty"`
+
+	// ResultId links to the CheckResult (nil if execution not completed)
+	ResultId *Identifier `json:"result_id,omitempty" swaggertype:"string"`
+
+	// Options contains the checker configuration for this execution
+	Options CheckerOptions `json:"options,omitempty"`
+}
+
+// CheckResultUsecase defines business logic for check results
+type CheckResultUsecase interface {
+	// ListCheckerStatuses returns all checkers applicable to scope with their
+	// schedule and most recent result for the given target.
+	ListCheckerStatuses(scope CheckScopeType, targetID Identifier, insideScope *CheckScopeType, insideID *Identifier, user *User, domain *Domain, service *Service) ([]CheckerStatus, error)
+
+	// ListCheckResultsByTarget retrieves check results for a specific target owned by userId
+	ListCheckResultsByTarget(checkerName string, targetType CheckScopeType, targetId Identifier, insideScope *CheckScopeType, insideID *Identifier, userId Identifier, limit int) ([]*CheckResult, error)
+
+	// ListAllCheckResultsByTarget retrieves all check results for a target across all checkers
+	ListAllCheckResultsByTarget(targetType CheckScopeType, targetId Identifier, insideScope *CheckScopeType, insideID *Identifier, userId Identifier, limit int) ([]*CheckResult, error)
+
+	// GetCheckResult retrieves a specific check result owned by userId
+	GetCheckResult(checkName string, targetType CheckScopeType, targetId Identifier, resultId Identifier, insideScope *CheckScopeType, insideID *Identifier, userId Identifier) (*CheckResult, error)
+
+	// CreateCheckResult stores a new check result and enforces retention policy
+	CreateCheckResult(result *CheckResult) error
+
+	// DeleteCheckResult removes a specific check result owned by userId
+	DeleteCheckResult(checkName string, targetType CheckScopeType, targetId Identifier, resultId Identifier, insideScope *CheckScopeType, insideID *Identifier, userId Identifier) error
+
+	// DeleteAllCheckResults removes all results for a specific checker+target combination owned by userId
+	DeleteAllCheckResults(checkName string, targetType CheckScopeType, targetId Identifier, insideScope *CheckScopeType, insideID *Identifier, userId Identifier) error
+
+	// GetCheckExecution retrieves the status of a check execution
+	GetCheckExecution(executionId Identifier) (*CheckExecution, error)
+
+	// CreateCheckExecution creates a new check execution record
+	CreateCheckExecution(execution *CheckExecution) error
+
+	// UpdateCheckExecution updates an existing check execution
+	UpdateCheckExecution(execution *CheckExecution) error
+
+	// CompleteCheckExecution marks an execution as completed with a result
+	CompleteCheckExecution(executionId Identifier, resultId Identifier) error
+
+	// FailCheckExecution marks an execution as failed
+	FailCheckExecution(executionId Identifier, errorMsg string) error
+
+	// DeleteCompletedExecutions removes execution records older than the given duration.
+	DeleteCompletedExecutions(olderThan time.Duration) error
+
+	// CleanupOldResults removes check results older than the configured retention period.
+	CleanupOldResults() error
+
+	// GetWorstCheckStatus returns the worst (most critical) status from the most
+	// recent result of each checker for a given target. Returns nil if no results exist.
+	GetWorstCheckStatus(targetType CheckScopeType, targetId Identifier, insideScope *CheckScopeType, insideID *Identifier, userId Identifier) (*CheckResultStatus, error)
+
+	// GetWorstCheckStatusByUser returns a map from target ID string to worst check
+	// status for all targets of the given type owned by the user, in a single pass.
+	GetWorstCheckStatusByUser(targetType CheckScopeType, userId Identifier) (map[string]*CheckResultStatus, error)
+}

model/check_scheduler.go

@@ -0,0 +1,153 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package happydns
+
+import (
+	"time"
+)
+
+// SchedulerUsecase defines the interface for triggering on-demand checks
+type SchedulerUsecase interface {
+	Run()
+	Close()
+	TriggerOnDemandCheck(checkerName string, targetType CheckScopeType, targetID Identifier, insideScopeType *CheckScopeType, insideID *Identifier, userID Identifier, options CheckerOptions) (Identifier, error)
+	GetSchedulerStatus() SchedulerStatus
+	SetEnabled(enabled bool) error
+	RescheduleUpcomingChecks() (int, error)
+}
+
+// CheckerSchedule defines a recurring check schedule
+type CheckerSchedule struct {
+	// Id is the unique identifier for this schedule
+	Id Identifier `json:"id" swaggertype:"string"`
+
+	// CheckerName identifies which checker to execute
+	CheckerName string `json:"checker_name"`
+
+	// OwnerId is the owner of the schedule
+	OwnerId Identifier `json:"owner_id" swaggertype:"string"`
+
+	// InsideType indicates the scope level of the parent target
+	InsideType *CheckScopeType `json:"check_type"`
+
+	// InsideId is the identifier of the parent target (User/Domain)
+	InsideId *Identifier `json:"inside_id" swaggertype:"string"`
+
+	// TargetType indicates what type of target to check
+	TargetType CheckScopeType `json:"target_type"`
+
+	// TargetId is the identifier of the target to check
+	TargetId Identifier `json:"target_id" swaggertype:"string"`
+
+	// Interval is how often to run the check
+	Interval time.Duration `json:"interval" swaggertype:"integer"`
+
+	// Enabled indicates if the schedule is active
+	Enabled bool `json:"enabled"`
+
+	// LastRun is when the check was last executed (nil if never run)
+	LastRun *time.Time `json:"last_run,omitempty"`
+
+	// NextRun is when the check should next be executed
+	NextRun time.Time `json:"next_run"`
+
+	// Options contains checker-specific configuration
+	Options CheckerOptions `json:"options,omitempty"`
+}
+
+// SchedulerStatus holds a snapshot of the scheduler state for monitoring
+type SchedulerStatus struct {
+	// ConfigEnabled indicates if the scheduler is enabled in the configuration file
+	ConfigEnabled bool `json:"config_enabled"`
+
+	// RuntimeEnabled indicates if the scheduler is currently enabled at runtime
+	RuntimeEnabled bool `json:"runtime_enabled"`
+
+	// Running indicates if the scheduler goroutine is currently running
+	Running bool `json:"running"`
+
+	// WorkerCount is the number of worker goroutines
+	WorkerCount int `json:"worker_count"`
+
+	// QueueSize is the number of items currently waiting in the execution queue
+	QueueSize int `json:"queue_size"`
+
+	// ActiveCount is the number of checks currently being executed
+	ActiveCount int `json:"active_count"`
+
+	// NextSchedules contains the upcoming scheduled checks sorted by next run time
+	NextSchedules []*CheckerSchedule `json:"next_schedules"`
+}
+
+// CheckerScheduleUsecase defines business logic for check schedules
+type CheckerScheduleUsecase interface {
+	// ListUserSchedules retrieves all schedules for a specific user
+	ListUserSchedules(userId Identifier) ([]*CheckerSchedule, error)
+
+	// ListSchedulesByTarget retrieves all schedules for a specific target
+	ListSchedulesByTarget(targetType CheckScopeType, targetId Identifier, insideType *CheckScopeType, insideId *Identifier) ([]*CheckerSchedule, error)
+
+	// GetSchedule retrieves a specific schedule by ID
+	GetSchedule(scheduleId Identifier) (*CheckerSchedule, error)
+
+	// CreateSchedule creates a new check schedule with validation
+	CreateSchedule(schedule *CheckerSchedule) error
+
+	// UpdateSchedule updates an existing schedule
+	UpdateSchedule(schedule *CheckerSchedule) error
+
+	// DeleteSchedule removes a schedule
+	DeleteSchedule(scheduleId Identifier) error
+
+	// EnableSchedule enables a schedule
+	EnableSchedule(scheduleId Identifier) error
+
+	// DisableSchedule disables a schedule
+	DisableSchedule(scheduleId Identifier) error
+
+	// UpdateScheduleAfterRun updates a schedule after it has been executed
+	UpdateScheduleAfterRun(scheduleId Identifier) error
+
+	// ListDueSchedules retrieves all enabled schedules that are due to run
+	ListDueSchedules() ([]*CheckerSchedule, error)
+
+	// ValidateScheduleOwnership checks if a user owns a schedule
+	ValidateScheduleOwnership(scheduleId Identifier, ownerId Identifier) error
+
+	// DeleteSchedulesForTarget removes all schedules for a target
+	DeleteSchedulesForTarget(targetType CheckScopeType, targetId Identifier, insideType *CheckScopeType, insideId *Identifier, ownerId Identifier) error
+
+	// ListUpcomingSchedules retrieves the next limit enabled schedules sorted by NextRun ascending.
+	ListUpcomingSchedules(limit int) ([]*CheckerSchedule, error)
+
+	// DiscoverAndEnsureSchedules creates default enabled schedules for all (plugin, domain) pairs
+	// that do not already have a schedule.
+	DiscoverAndEnsureSchedules() error
+
+	// RescheduleUpcomingChecks randomizes next run times for all enabled schedules
+	// within their respective intervals to spread load evenly.
+	RescheduleUpcomingChecks() (int, error)
+
+	// RescheduleOverdueTests reschedules overdue tests to run soon, spread over a
+	// short window to avoid scheduler famine after a suspend or server restart.
+	RescheduleOverdueChecks() (int, error)
+}

model/checker.go

@@ -0,0 +1,199 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package happydns
+
+import (
+	"context"
+	"encoding/json"
+	"time"
+)
+
+// Auto-fill variable identifiers for checker option fields.
+const (
+	// AutoFillDomainName fills the option with the fully qualified domain name
+	// of the domain being tested (e.g. "example.com.").
+	AutoFillDomainName = "domain_name"
+
+	// AutoFillSubdomain fills the option with the subdomain relative to the zone
+	// (e.g. "www" for "www.example.com." in zone "example.com."). Only
+	// applicable for service-scoped tests.
+	AutoFillSubdomain = "subdomain"
+
+	// AutoFillZone fills the option with the zone object. Only applicable
+	// for domain-scoped and service-scoped tests.
+	AutoFillZone = "zone"
+
+	// AutoFillServiceType fills the option with the service type identifier
+	// (e.g. "abstract.MatrixIM"). Only applicable for service-scoped tests.
+	AutoFillServiceType = "service_type"
+
+	// AutoFillService fills the option with the service object. Only applicable
+	// for service-scoped tests.
+	AutoFillService = "service"
+)
+
+const (
+	CheckResultStatusUnknown CheckResultStatus = iota
+	CheckResultStatusCritical
+	CheckResultStatusWarn
+	CheckResultStatusInfo
+	CheckResultStatusOK
+)
+
+type CheckResultStatus int
+
+func (s CheckResultStatus) String() string {
+	switch s {
+	case CheckResultStatusOK:
+		return "ok"
+	case CheckResultStatusWarn:
+		return "warning"
+	case CheckResultStatusCritical:
+		return "critical"
+	case CheckResultStatusInfo:
+		return "info"
+	default:
+		return "unknown"
+	}
+}
+
+type CheckerOptions map[string]any
+
+type Checker interface {
+	ID() string
+	Name() string
+	Availability() CheckerAvailability
+	Options() CheckerOptionsDocumentation
+	RunCheck(ctx context.Context, options CheckerOptions, meta map[string]string) (*CheckResult, error)
+}
+
+// CheckIntervalSpec describes the scheduling bounds for a checker.
+type CheckIntervalSpec struct {
+	Min     time.Duration `json:"min" swaggertype:"integer"`
+	Max     time.Duration `json:"max" swaggertype:"integer"`
+	Default time.Duration `json:"default" swaggertype:"integer"`
+}
+
+// CheckerIntervalProvider is an optional interface checkers can implement
+// to declare their preferred scheduling bounds. The scheduler enforces
+// Min/Max; Default is used when creating a new schedule with no explicit interval.
+type CheckerIntervalProvider interface {
+	CheckInterval() CheckIntervalSpec
+}
+
+// CheckerHTMLReporter is an optional interface checkers can implement
+// to render their stored report as a full HTML document (for iframe embedding).
+// Detect support with a type assertion: _, ok := checker.(CheckerHTMLReporter)
+type CheckerHTMLReporter interface {
+	// GetHTMLReport generates an HTML document from the JSON-encoded report data
+	// stored in CheckResult.Report.
+	// The raw parameter contains the JSON bytes of the Report field as stored.
+	GetHTMLReport(raw json.RawMessage) (string, error)
+}
+
+// MetricPoint represents a single data point in a time series.
+type MetricPoint struct {
+	Timestamp time.Time `json:"timestamp"`
+	Value     float64   `json:"value"`
+}
+
+// MetricSeries represents a named time series with a display label and unit.
+type MetricSeries struct {
+	Name   string        `json:"name"`
+	Label  string        `json:"label"`
+	Unit   string        `json:"unit"`
+	Points []MetricPoint `json:"points"`
+}
+
+// MetricsReport contains all metric series extracted from check results.
+type MetricsReport struct {
+	Series []MetricSeries `json:"series"`
+}
+
+// CheckerMetricsReporter is an optional interface checkers can implement
+// to signal that they produce time-series metrics suitable for charting.
+// Detect support with a type assertion: _, ok := checker.(CheckerMetricsReporter)
+type CheckerMetricsReporter interface {
+	// ExtractMetrics builds time series from a slice of check results.
+	// Each result's ExecutedAt becomes the timestamp for that data point.
+	ExtractMetrics(results []*CheckResult) (*MetricsReport, error)
+}
+
+type CheckerResponse struct {
+	ID            string                      `json:"id"`
+	Name          string                      `json:"name"`
+	Availability  CheckerAvailability         `json:"availability"`
+	Options       CheckerOptionsDocumentation `json:"options"`
+	Interval      *CheckIntervalSpec          `json:"interval"`
+	HasHTMLReport bool                        `json:"has_html_report,omitempty"`
+	HasMetrics    bool                        `json:"has_metrics,omitempty"`
+}
+
+type SetCheckerOptionsRequest struct {
+	Options CheckerOptions `json:"options"`
+}
+
+type CheckerOptionsPositional struct {
+	CheckName string
+	UserId    *Identifier
+	DomainId  *Identifier
+	ServiceId *Identifier
+
+	Options CheckerOptions
+}
+
+type CheckerAvailability struct {
+	ApplyToDomain    bool     `json:"applyToDomain,omitempty"`
+	ApplyToService   bool     `json:"applyToService,omitempty"`
+	LimitToProviders []string `json:"limitToProviders,omitempty"`
+	LimitToServices  []string `json:"limitToServices,omitempty"`
+}
+
+type CheckerOptionsDocumentation struct {
+	RunOpts     []CheckerOptionDocumentation `json:"runOpts,omitempty"`
+	ServiceOpts []CheckerOptionDocumentation `json:"serviceOpts,omitempty"`
+	DomainOpts  []CheckerOptionDocumentation `json:"domainOpts,omitempty"`
+	UserOpts    []CheckerOptionDocumentation `json:"userOpts,omitempty"`
+	AdminOpts   []CheckerOptionDocumentation `json:"adminOpts,omitempty"`
+}
+
+type CheckerOptionDocumentation Field
+
+// CheckerStatus represents the current status of a checker for a specific target,
+// including whether it is enabled, its schedule, and the most recent result.
+type CheckerStatus struct {
+	CheckerName   string           `json:"checker_name"`
+	NotDiscovered bool             `json:"not_discovered,omitempty"`
+	Enabled       bool             `json:"enabled"`
+	Schedule      *CheckerSchedule `json:"schedule,omitempty"`
+	LastResult    *CheckResult     `json:"last_result,omitempty"`
+}
+
+type CheckerUsecase interface {
+	BuildMergedCheckerOptions(string, *Identifier, *Identifier, *Identifier, CheckerOptions) (CheckerOptions, error)
+	GetStoredCheckerOptionsNoDefault(string, *Identifier, *Identifier, *Identifier) (CheckerOptions, error)
+	GetChecker(string) (Checker, error)
+	GetCheckerOptions(string, *Identifier, *Identifier, *Identifier) (*CheckerOptions, error)
+	ListCheckers() (*map[string]Checker, error)
+	OverwriteSomeCheckerOptions(string, *Identifier, *Identifier, *Identifier, CheckerOptions) error
+	SetCheckerOptions(string, *Identifier, *Identifier, *Identifier, CheckerOptions) error
+}

model/config.go

@@ -99,6 +99,20 @@ type Options struct {
 	// CaptchaLoginThreshold is the number of consecutive login failures before captcha is required.
 	// 0 means always require captcha at login (when provider is configured).
 	CaptchaLoginThreshold int
+
+	PluginsDirectories []string
+
+	// MaxResultsPerCheck is the maximum number of test results to keep per plugin+target combination
+	MaxResultsPerCheck int
+
+	// ResultRetentionDays is how long to keep test results before cleanup
+	ResultRetentionDays int
+
+	// TestWorkers is the number of concurrent test executions allowed
+	TestWorkers int
+
+	// DisableScheduler disables the background test scheduler
+	DisableScheduler bool
 }
 
 // GetBaseURL returns the full url to the absolute ExternalURL, including BaseURL.

model/domain.go

@@ -97,6 +97,13 @@ type DomainWithZoneMetadata struct {
 	ZoneMeta map[string]*ZoneMeta `json:"zone_meta"`
 }
 
+type DomainWithCheckStatus struct {
+	*Domain
+	// LastCheckStatus is the worst status across the most recent result of each
+	// checker that has run on this domain. Nil if no results exist yet.
+	LastCheckStatus *CheckResultStatus `json:"last_check_status,omitempty"`
+}
+
 type Subdomain string
 type Origin string
 

model/domain_info.go

@@ -0,0 +1,48 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2025 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package happydns
+
+import (
+	"context"
+	"errors"
+	"time"
+)
+
+var (
+	DomainDoesNotExist = errors.New("domain name doesn't exist")
+)
+
+type DomainInfo struct {
+	Name           string     `json:"name"`
+	Nameservers    []string   `json:"nameservers"`
+	CreationDate   *time.Time `json:"creation"`
+	ExpirationDate *time.Time `json:"expiration"`
+	Registrar      string     `json:"registrar"`
+	RegistrarURL   *string    `json:"registrar_url"`
+	Status         []string   `json:"status"`
+}
+
+type DomainInfoGetter func(context.Context, Origin) (*DomainInfo, error)
+
+type DomainInfoUsecase interface {
+	GetDomainInfo(context.Context, Origin) (*DomainInfo, error)
+}

model/errors.go

@@ -27,15 +27,18 @@ import (
 )
 
 var (
-	ErrAuthUserNotFound  = errors.New("user not found")
+	ErrAuthUserNotFound       = errors.New("user not found")
-	ErrDomainNotFound    = errors.New("domain not found")
+	ErrCheckExecutionNotFound = errors.New("check execution not found")
-	ErrDomainLogNotFound = errors.New("domain log not found")
+	ErrCheckResultNotFound    = errors.New("check result not found")
-	ErrProviderNotFound  = errors.New("provider not found")
+	ErrCheckScheduleNotFound  = errors.New("check schedule not found")
-	ErrSessionNotFound   = errors.New("session not found")
+	ErrDomainNotFound         = errors.New("domain not found")
-	ErrUserNotFound      = errors.New("user not found")
+	ErrDomainLogNotFound      = errors.New("domain log not found")
-	ErrUserAlreadyExist  = errors.New("user already exists")
+	ErrProviderNotFound       = errors.New("provider not found")
-	ErrZoneNotFound      = errors.New("zone not found")
+	ErrSessionNotFound        = errors.New("session not found")
-	ErrNotFound          = errors.New("not found")
+	ErrUserNotFound           = errors.New("user not found")
+	ErrUserAlreadyExist       = errors.New("user already exists")
+	ErrZoneNotFound           = errors.New("zone not found")
+	ErrNotFound               = errors.New("not found")
 )
 
 const TryAgainErr = "Sorry, we are currently unable to sent email validation link. Please try again later."

model/form.go

@@ -104,6 +104,11 @@ type Field struct {
 
 	// Description stores an helpfull sentence describing the field.
 	Description string `json:"description,omitempty"`
+
+	// AutoFill indicates the field value is automatically resolved by the
+	// software based on test context. When set, the value should not be
+	// entered by the user.
+	AutoFill string `json:"autoFill,omitempty"`
 }
 
 type FormState struct {

model/identifier.go

@@ -27,6 +27,7 @@ import (
 	"encoding/base64"
 	"encoding/gob"
 	"errors"
+	"slices"
 )
 
 const IDENTIFIER_LEN = 16
@@ -55,6 +56,10 @@ func (i Identifier) Equals(other Identifier) bool {
 	return bytes.Equal(i, other)
 }
 
+func (i Identifier) Compare(other Identifier) int {
+	return slices.Compare(i, other)
+}
+
 func (i *Identifier) String() string {
 	return base64.RawURLEncoding.EncodeToString(*i)
 }

model/service.go

@@ -127,6 +127,13 @@ type ServiceRecord struct {
 	RR     Record `json:"rr,omitempty"`
 }
 
+type ServiceWithCheckStatus struct {
+	*Service
+	// LastCheckStatus is the worst status across the most recent result of each
+	// checker that has run on this service. Nil if no results exist yet.
+	LastCheckStatus *CheckResultStatus `json:"last_check_status,omitempty"`
+}
+
 type ServiceUsecase interface {
 	ListRecords(*Domain, *Zone, *Service) ([]Record, error)
 	ValidateService(ServiceBody, Subdomain, Origin) ([]byte, error)

model/usersettings.go

@@ -61,6 +61,17 @@ type UserSettings struct {
 
 	// ShowRRTypes tells if we show equivalent RRTypes in interface (for advanced users).
 	ShowRRTypes bool `json:"showrrtypes,omitempty"`
+
+	// TestRetention overrides instance default for how long to keep test results (days)
+	TestRetention int `json:"test_retention,omitempty"`
+
+	// DomainTestInterval is the default interval for domain-level tests (seconds)
+	// Default: 86400 (24 hours)
+	DomainTestInterval int64 `json:"domain_test_interval,omitempty"`
+
+	// ServiceTestInterval is the default interval for service-level tests (seconds)
+	// Default: 3600 (1 hour)
+	ServiceTestInterval int64 `json:"service_test_interval,omitempty"`
 }
 
 func DefaultUserSettings() *UserSettings {

model/zone.go

@@ -154,6 +154,13 @@ type ZoneServices struct {
 	Services []*Service `json:"services"`
 }
 
+type ZoneWithServicesCheckStatus struct {
+	*Zone
+	// ServicesCheckStatus holds the worst check status for each service,
+	// keyed by service identifier string. Nil/absent if no results exist yet.
+	ServicesCheckStatus map[string]*CheckResultStatus `json:"services_check_status,omitempty"`
+}
+
 type ZoneUsecase interface {
 	AddRecord(*Zone, string, Record) error
 	CreateZone(*Zone) error

pkg/domaininfo/rdap.go

@@ -0,0 +1,111 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2025 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package domaininfo
+
+import (
+	"context"
+	"time"
+
+	"git.happydns.org/happyDomain/model"
+
+	"github.com/openrdap/rdap"
+)
+
+func GetDomainRDAPInfo(ctx context.Context, domain happydns.Origin) (*happydns.DomainInfo, error) {
+	client := &rdap.Client{}
+	req := rdap.NewDomainRequest(string(domain)).WithContext(ctx)
+	resp, err := client.Do(req)
+	var domainInfo *rdap.Domain
+	if err == nil {
+		var ok bool
+		domainInfo, ok = resp.Object.(*rdap.Domain)
+		if !ok {
+			err = context.DeadlineExceeded // shouldn't happen, but guard anyway
+		}
+	}
+	if err != nil {
+		if ce, ok := err.(*rdap.ClientError); ok && ce.Type == rdap.ObjectDoesNotExist {
+			return nil, happydns.DomainDoesNotExist
+		}
+		return nil, err
+	}
+
+	// Registrar
+	registrar := "Unknown"
+	var registrar_url *string
+	for _, ent := range domainInfo.Entities {
+		if ent.Roles != nil {
+			for _, role := range ent.Roles {
+				if role == "registrar" && ent.VCard != nil && len(ent.VCard.Get("fn")) > 0 {
+					registrar = ent.VCard.Get("fn")[0].Value.(string)
+					if len(ent.VCard.Get("url")) > 0 {
+						url := ent.VCard.Get("url")[0].Value.(string)
+						registrar_url = &url
+					}
+				}
+			}
+		}
+	}
+
+	// Dates
+	var expiration *time.Time
+	var creation *time.Time
+	for _, event := range domainInfo.Events {
+		if (event.Action == "expiration" || event.Action == "registration") && event.Date != "" {
+			date, err := time.Parse(time.RFC3339, event.Date)
+			if err != nil {
+				return nil, err
+			}
+
+			if event.Action == "expiration" {
+				expiration = &date
+			} else if event.Action == "registration" {
+				creation = &date
+			}
+		}
+	}
+
+	// Nameservers
+	var nameservers []string
+	for _, nameserver := range domainInfo.Nameservers {
+		if nameserver.UnicodeName != "" {
+			nameservers = append(nameservers, nameserver.UnicodeName)
+		} else {
+			nameservers = append(nameservers, nameserver.LDHName)
+		}
+	}
+
+	name := domainInfo.UnicodeName
+	if name == "" {
+		name = domainInfo.LDHName
+	}
+
+	return &happydns.DomainInfo{
+		Name:           name,
+		Nameservers:    nameservers,
+		CreationDate:   creation,
+		ExpirationDate: expiration,
+		Registrar:      registrar,
+		RegistrarURL:   registrar_url,
+		Status:         domainInfo.Status,
+	}, nil
+}

pkg/domaininfo/rdap_test.go

@@ -0,0 +1,72 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2025 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package domaininfo_test
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	happydns "git.happydns.org/happyDomain/model"
+	"git.happydns.org/happyDomain/pkg/domaininfo"
+)
+
+func TestGetDomainRDAPInfo_KnownDomain(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping live RDAP integration test")
+	}
+
+	info, err := domaininfo.GetDomainRDAPInfo(context.Background(), happydns.Origin("example.com"))
+	if err != nil {
+		t.Fatalf("unexpected error for example.com: %v", err)
+	}
+	if info == nil {
+		t.Fatal("expected non-nil DomainInfo")
+	}
+	if info.Name == "" {
+		t.Error("expected Name to be set")
+	}
+	if len(info.Nameservers) == 0 {
+		t.Error("expected at least one nameserver")
+	}
+	if info.ExpirationDate == nil {
+		t.Error("expected ExpirationDate to be set")
+	}
+	if info.CreationDate == nil {
+		t.Error("expected CreationDate to be set")
+	}
+	if info.Registrar == "" {
+		t.Error("expected Registrar to be set")
+	}
+}
+
+func TestGetDomainRDAPInfo_NonExistentDomain(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping live RDAP integration test")
+	}
+
+	_, err := domaininfo.GetDomainRDAPInfo(context.Background(), happydns.Origin("this-domain-definitely-does-not-exist-xyz987654321.com"))
+	if !errors.Is(err, happydns.DomainDoesNotExist) {
+		t.Errorf("expected DomainDoesNotExist error, got: %v", err)
+	}
+}
+

pkg/domaininfo/whois.go

@@ -0,0 +1,75 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2025 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package domaininfo
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"git.happydns.org/happyDomain/model"
+
+	"github.com/likexian/whois"
+	"github.com/likexian/whois-parser"
+)
+
+func GetDomainWhoisInfo(ctx context.Context, domain happydns.Origin) (*happydns.DomainInfo, error) {
+	client := whois.NewClient()
+
+	// The whois library has no context support; derive a timeout from the
+	// context deadline so we at least honour it approximately.
+	if deadline, ok := ctx.Deadline(); ok {
+		if remaining := time.Until(deadline); remaining > 0 {
+			client.SetTimeout(remaining)
+		}
+	}
+
+	raw, err := client.Whois(string(domain))
+	if err != nil {
+		return nil, err
+	}
+
+	result, err := whoisparser.Parse(raw)
+	if err != nil {
+		if errors.Is(err, whoisparser.ErrNotFoundDomain) {
+			return nil, happydns.DomainDoesNotExist
+		}
+		return nil, err
+	}
+
+	registrar := "Unknown"
+	var registrar_url *string
+	if result.Registrar != nil {
+		registrar = result.Registrar.Name
+		registrar_url = &result.Registrar.ReferralURL
+	}
+
+	return &happydns.DomainInfo{
+		Name:           result.Domain.Domain,
+		Nameservers:    result.Domain.NameServers,
+		CreationDate:   result.Domain.CreatedDateInTime,
+		ExpirationDate: result.Domain.ExpirationDateInTime,
+		Registrar:      registrar,
+		RegistrarURL:   registrar_url,
+		Status:         result.Domain.Status,
+	}, nil
+}

pkg/domaininfo/whois_test.go

@@ -0,0 +1,75 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2020-2025 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package domaininfo_test
+
+import (
+	"context"
+	"testing"
+
+	happydns "git.happydns.org/happyDomain/model"
+	"git.happydns.org/happyDomain/pkg/domaininfo"
+)
+
+func TestGetDomainWhoisInfo_KnownDomain(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping live WHOIS integration test")
+	}
+
+	info, err := domaininfo.GetDomainWhoisInfo(context.Background(), happydns.Origin("example.com"))
+	if err != nil {
+		t.Fatalf("unexpected error for example.com: %v", err)
+	}
+	if info == nil {
+		t.Fatal("expected non-nil DomainInfo")
+	}
+	if info.Name == "" {
+		t.Error("expected Name to be set")
+	}
+	if len(info.Nameservers) == 0 {
+		t.Error("expected at least one nameserver")
+	}
+	if info.ExpirationDate == nil {
+		t.Error("expected ExpirationDate to be set")
+	}
+	if info.CreationDate == nil {
+		t.Error("expected CreationDate to be set")
+	}
+	if info.Registrar == "" {
+		t.Error("expected Registrar to be set")
+	}
+}
+
+func TestGetDomainWhoisInfo_NilRegistrarURL(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping live WHOIS integration test")
+	}
+
+	// example.com's registrar referral URL may be empty; the function should
+	// not panic and should return a valid DomainInfo regardless.
+	info, err := domaininfo.GetDomainWhoisInfo(context.Background(), happydns.Origin("example.com"))
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	// RegistrarURL may be nil or non-nil depending on the WHOIS data; just
+	// confirm the function handled it without panicking.
+	_ = info.RegistrarURL
+}

plugins/.gitignore

@@ -0,0 +1 @@
+*.so

plugins/README.md

@@ -0,0 +1,336 @@
+# Writing a happyDomain Plugin
+
+happyDomain supports external **check plugins** — shared libraries (`.so` files) that run domain health checks and diagnostics. Plugins are loaded at runtime and integrate seamlessly into happyDomain's domain and service testing UI.
+
+## Overview
+
+A plugin is a Go shared library (`-buildmode=plugin`) that exports a single entry point: `NewCheckPlugin`. At startup, happyDomain scans its configured plugin directories, loads each `.so` file it finds, calls `NewCheckPlugin`, and registers the returned checker under the declared name.
+
+A plugin implements the `Checker` interface from `git.happydns.org/happyDomain/model`:
+
+```go
+type Checker interface {
+    ID() string
+    Name() string
+    Availability() CheckerAvailability
+    Options() CheckerOptionsDocumentation
+    RunCheck(options CheckerOptions, meta map[string]string) (*CheckResult, error)
+}
+```
+
+---
+
+## Project Structure
+
+A minimal plugin lives in its own directory with `package main`:
+
+```
+myplugin/
+├── go.mod
+├── Makefile
+└── plugin.go      (or split across multiple .go files)
+```
+
+### go.mod
+
+Your plugin must declare the same module path as its source tree and depend on the happyDomain model:
+
+```
+module git.happydns.org/happyDomain/plugins/myplugin
+
+go 1.25
+
+require git.happydns.org/happyDomain v0.0.0
+replace git.happydns.org/happyDomain => ../../
+```
+
+The `replace` directive points to your local happyDomain checkout, ensuring the plugin is compiled against the exact same types.
+
+> **Important:** A Go plugin and the host program must be built with the same Go toolchain version and the same versions of all shared dependencies. Any mismatch will cause a runtime load error.
+
+---
+
+## The Entry Point
+
+Every plugin must export a `NewCheckPlugin` function with this exact signature:
+
+```go
+package main
+
+import "git.happydns.org/happyDomain/model"
+
+func NewCheckPlugin() (string, happydns.Checker, error) {
+    return "myplugin", &MyPlugin{}, nil
+}
+```
+
+The first return value is the unique registration name for the checker. You can use the constructor to perform one-time initialisation (read config files, create HTTP clients, etc.) and return an error if the plugin cannot function.
+
+---
+
+## Implementing the Interface
+
+### `ID() string`
+
+Returns the unique string identifier for the checker. This name is used internally to look up the checker and to store its configuration. Use a short, lowercase, collision-resistant name:
+
+```go
+func (p *MyPlugin) ID() string {
+    return "myplugin"
+}
+```
+
+The value returned here should match the name returned by `NewCheckPlugin`. If two checkers claim the same ID, the second one is silently ignored and a conflict is logged.
+
+---
+
+### `Name() string`
+
+Returns a human-readable display name for the checker:
+
+```go
+func (p *MyPlugin) Name() string {
+    return "My Plugin"
+}
+```
+
+---
+
+### `Availability() CheckerAvailability`
+
+Declares where the checker applies:
+
+```go
+func (p *MyPlugin) Availability() happydns.CheckerAvailability {
+    return happydns.CheckerAvailability{
+        ApplyToDomain:    true,
+        ApplyToService:   false,
+        LimitToProviders: []string{},       // empty = all providers
+        LimitToServices:  []string{"abstract.MatrixIM"},
+    }
+}
+```
+
+`CheckerAvailability` fields:
+
+| Field | Type | Description |
+|---|---|---|
+| `ApplyToDomain` | `bool` | Checker can be run against a whole domain |
+| `ApplyToService` | `bool` | Checker can be run against a specific service |
+| `LimitToProviders` | `[]string` | Restrict to certain DNS provider identifiers (empty = no restriction) |
+| `LimitToServices` | `[]string` | Restrict to certain service type identifiers, e.g. `"abstract.MatrixIM"` (empty = no restriction) |
+
+---
+
+### `Options() CheckerOptionsDocumentation`
+
+Declares all configurable options, grouped by **who sets them** and **at which scope**:
+
+```go
+func (p *MyPlugin) Options() happydns.CheckerOptionsDocumentation {
+    return happydns.CheckerOptionsDocumentation{
+        RunOpts:     []happydns.CheckerOptionDocumentation{ /* per-run options */ },
+        ServiceOpts: []happydns.CheckerOptionDocumentation{ /* per-service options */ },
+        DomainOpts:  []happydns.CheckerOptionDocumentation{ /* per-domain options */ },
+        UserOpts:    []happydns.CheckerOptionDocumentation{ /* per-user options */ },
+        AdminOpts:   []happydns.CheckerOptionDocumentation{ /* admin-only options */ },
+    }
+}
+```
+
+#### Option scopes
+
+| Field | Who sets it | Typical use |
+|---|---|---|
+| `RunOpts` | The user at test time | Test-specific parameters (e.g. domain to test) |
+| `ServiceOpts` | The user, per service | Configuration scoped to a DNS service |
+| `DomainOpts` | The user, per domain | Configuration scoped to a whole domain |
+| `UserOpts` | The user, globally | Personal preferences (e.g. language) |
+| `AdminOpts` | The instance administrator | Backend URLs, API keys shared by all users |
+
+Options from all scopes are **merged** before `RunCheck` is called, with more-specific scopes overriding less-specific ones.
+
+#### CheckerOptionDocumentation fields
+
+Each option is described by a `CheckerOptionDocumentation` (an alias for `Field`):
+
+| Field | Type | Description |
+|---|---|---|
+| `Id` | `string` | **Required.** Key used in `CheckerOptions` map |
+| `Type` | `string` | Input type: `"string"`, `"select"`, … |
+| `Label` | `string` | Human-readable label shown in the UI |
+| `Placeholder` | `string` | Input placeholder text |
+| `Default` | `any` | Default value pre-filled in the form |
+| `Choices` | `[]string` | Available choices for `"select"` type inputs |
+| `Required` | `bool` | Whether the field must be filled before running |
+| `Secret` | `bool` | Marks the field as sensitive (e.g. API key) |
+| `Hide` | `bool` | Hides the field from the user |
+| `Textarea` | `bool` | Displays a multiline text area |
+| `Description` | `string` | Help text shown below the field |
+| `AutoFill` | `string` | Automatically populate the field from context (see below) |
+
+#### Auto-fill variables
+
+When a field's `AutoFill` is set, happyDomain populates it from the test context — the user does not need to fill it in:
+
+| Constant | Value | Filled with |
+|---|---|---|
+| `happydns.AutoFillDomainName` | `"domain_name"` | The FQDN of the domain under test (e.g. `"example.com."`) |
+| `happydns.AutoFillSubdomain` | `"subdomain"` | Subdomain relative to the zone (service-scoped tests only) |
+| `happydns.AutoFillServiceType` | `"service_type"` | Service type identifier (service-scoped tests only) |
+
+```go
+{
+    Id:       "domainName",
+    Type:     "string",
+    Label:    "Domain name",
+    AutoFill: happydns.AutoFillDomainName,
+    Required: true,
+},
+```
+
+---
+
+### `RunCheck(options CheckerOptions, meta map[string]string) (*CheckResult, error)`
+
+This is where the actual check happens. `options` is the merged map of all scoped options (keyed by option `Id`). `meta` carries additional context provided by the scheduler (currently reserved for future use).
+
+```go
+func (p *MyPlugin) RunCheck(options happydns.CheckerOptions, meta map[string]string) (*happydns.CheckResult, error) {
+    domain, ok := options["domainName"].(string)
+    if !ok || domain == "" {
+        return nil, fmt.Errorf("domainName is required")
+    }
+
+    // ... perform the check ...
+
+    return &happydns.CheckResult{
+        Status:     happydns.CheckResultStatusOK,
+        StatusLine: "All good",
+        Report:     myDetailedReport,
+    }, nil
+}
+```
+
+Return a non-nil `error` for hard failures (network errors, invalid options). Return a `CheckResult` with a `KO` status for expected failures (e.g. the DNS check failed).
+
+#### CheckResult fields set by the plugin
+
+| Field | Type | Description |
+|---|---|---|
+| `Status` | `CheckResultStatus` | Overall result level |
+| `StatusLine` | `string` | Short human-readable summary |
+| `Report` | `any` | Arbitrary data (serialised to JSON and stored) |
+
+The remaining fields (`Id`, `CheckerName`, `ExecutedAt`, etc.) are filled in by happyDomain automatically.
+
+#### CheckResultStatus values (ordered worst → best)
+
+| Constant | Meaning |
+|---|---|
+| `CheckResultStatusKO` | Check failed |
+| `CheckResultStatusWarn` | Check passed with warnings |
+| `CheckResultStatusInfo` | Informational result |
+| `CheckResultStatusOK` | Check fully passed |
+
+---
+
+## Full Example
+
+The matrix federation checker plugin (`matrix/`) illustrates a real-world plugin:
+
+**`main.go`** — exports the entry point:
+
+```go
+package main
+
+import "git.happydns.org/happyDomain/model"
+
+func NewCheckPlugin() (string, happydns.Checker, error) {
+    return "matrixim", &MatrixTester{
+        TesterURI: "https://federationtester.matrix.org/api/report?server_name=%s",
+    }, nil
+}
+```
+
+**`test.go`** — implements the interface on a struct:
+
+```go
+func (p *MatrixTester) ID() string { return "matrixim" }
+
+func (p *MatrixTester) Name() string { return "Matrix Federation Tester" }
+
+func (p *MatrixTester) Availability() happydns.CheckerAvailability {
+    return happydns.CheckerAvailability{
+        ApplyToService:  true,
+        LimitToServices: []string{"abstract.MatrixIM"},
+    }
+}
+
+func (p *MatrixTester) Options() happydns.CheckerOptionsDocumentation { /* ... */ }
+
+func (p *MatrixTester) RunCheck(options happydns.CheckerOptions, meta map[string]string) (*happydns.CheckResult, error) { /* ... */ }
+```
+
+The built-in Zonemaster checker (`checks/zonemaster.go`) shows a more complex flow: it starts an asynchronous test, polls for completion, and aggregates results across multiple severity levels. Although it is compiled in rather than loaded as a `.so`, it implements the same `Checker` interface and is a useful reference.
+
+---
+
+## Building
+
+Use `-buildmode=plugin`:
+
+```bash
+go build -buildmode=plugin -o happydomain-plugin-test-myplugin.so \
+    git.happydns.org/happyDomain/plugins/myplugin
+```
+
+A minimal `Makefile`:
+
+```makefile
+PLUGIN_NAME=myplugin
+TARGET=../happydomain-plugin-test-$(PLUGIN_NAME).so
+
+all: $(TARGET)
+
+$(TARGET): *.go
+	go build -buildmode=plugin -o $@ git.happydns.org/happyDomain/plugins/$(PLUGIN_NAME)
+```
+
+> **Naming convention:** happyDomain looks for any `.so` file in the plugin directory, but using the prefix `happydomain-plugin-test-` makes the purpose clear.
+
+---
+
+## Deployment
+
+### 1. Copy the `.so` file to a plugin directory
+
+```bash
+cp happydomain-plugin-test-myplugin.so /usr/lib/happydomain/plugins/
+```
+
+### 2. Configure happyDomain to load that directory
+
+In your `happydomain.conf`:
+
+```
+plugins-directories=/usr/lib/happydomain/plugins
+```
+
+Or via an environment variable:
+
+```bash
+HAPPYDOMAIN_PLUGINS_DIRECTORIES=/usr/lib/happydomain/plugins
+```
+
+Multiple directories can be specified as a comma-separated list. happyDomain scans each directory at startup and attempts to load every `.so` file it finds. Loading errors are logged but do not prevent the server from starting.
+
+### 3. Verify
+
+Check the server logs at startup for a line like:
+
+```
+Plugin myplugin loaded
+```
+
+If a name conflict or load error occurs, a warning is logged with the filename and reason.

plugins/matrix/Makefile

@@ -0,0 +1,7 @@
+PLUGIN_NAME=matrix
+TARGET=../happydomain-plugin-test-$(PLUGIN_NAME).so
+
+all: $(TARGET)
+
+$(TARGET): *.go
+	go build -buildmode=plugin -o $@ git.happydns.org/happyDomain/plugins/$(PLUGIN_NAME)

plugins/matrix/main.go

@@ -0,0 +1,11 @@
+package main
+
+import (
+	"git.happydns.org/happyDomain/model"
+)
+
+func NewCheckPlugin() (string, happydns.Checker, error) {
+	return "matrixim", &MatrixTester{
+		TesterURI: "https://federationtester.matrix.org/api/report?server_name=%s",
+	}, nil
+}

plugins/matrix/test.go

@@ -0,0 +1,552 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"html/template"
+	"log"
+	"net/http"
+	"strings"
+
+	"git.happydns.org/happyDomain/model"
+)
+
+type MatrixTester struct {
+	TesterURI string
+}
+
+func (p *MatrixTester) ID() string {
+	return "matrixim"
+}
+
+func (p *MatrixTester) Name() string {
+	return "Matrix Federation Tester"
+}
+
+func (p *MatrixTester) Availability() happydns.CheckerAvailability {
+	return happydns.CheckerAvailability{
+		ApplyToService:  true,
+		LimitToServices: []string{"abstract.MatrixIM"},
+	}
+}
+
+func (p *MatrixTester) Options() happydns.CheckerOptionsDocumentation {
+	return happydns.CheckerOptionsDocumentation{
+		RunOpts: []happydns.CheckerOptionDocumentation{
+			{
+				Id:          "serviceDomain",
+				Type:        "string",
+				Label:       "Matrix domain",
+				Placeholder: "matrix.org",
+				Default:     "matrix.org",
+				AutoFill:    happydns.AutoFillDomainName,
+				Required:    true,
+			},
+		},
+		AdminOpts: []happydns.CheckerOptionDocumentation{
+			{
+				Id:          "federationTesterServer",
+				Type:        "string",
+				Label:       "Federation Tester Server",
+				Placeholder: "https://federationtester.matrix.org/",
+				Default:     "https://federationtester.matrix.org/",
+				Required:    true,
+			},
+		},
+	}
+}
+
+type FederationTesterResponse struct {
+	WellKnownResult struct {
+		Server         string `json:"m.server"`
+		Result         string `json:"result"`
+		CacheExpiresAt int64  `json:"CacheExpiresAt"`
+	}
+	DNSResult struct {
+		SRVSkipped bool   `json:"SRVSkipped"`
+		SRVCName   string `json:"SRVCName"`
+		SRVRecords []struct {
+			Target   string `json:"Target"`
+			Port     uint16 `json:"Port"`
+			Priority uint16 `json:"Priority"`
+			Weight   uint16 `json:"Weight"`
+		} `json:"SRVRecords"`
+		SRVError *struct {
+			Message string `json:"Message"`
+		} `json:"SRVError"`
+		Hosts map[string]struct {
+			CName string   `json:"CName"`
+			Addrs []string `json:"Addrs"`
+		} `json:"Hosts"`
+		Addrs []string `json:"Addrs"`
+	}
+	ConnectionReports map[string]struct {
+		Certificates []struct {
+			SubjectCommonName string   `json:"SubjectCommonName"`
+			IssuerCommonName  string   `json:"IssuerCommonName"`
+			SHA256Fingerprint string   `json:"SHA256Fingerprint"`
+			DNSNames          []string `json:"DNSNames"`
+		}
+		Cipher struct {
+			Version     string `json:"Version"`
+			CipherSuite string `json:"CipherSuite"`
+		}
+		Checks struct {
+			AllChecksOK        bool `json:"AllChecksOK"`
+			MatchingServerName bool `json:"MatchingServerName"`
+			FutureValidUntilTS bool `json:"FutureValidUntilTS"`
+			HasEd25519Key      bool `json:"HasEd25519Key"`
+			AllEd25519ChecksOK bool `json:"AllEd25519ChecksOK"`
+			ValidCertificates  bool `json:"ValidCertificates"`
+		}
+		Errors []string
+	}
+	ConnectionErrors map[string]struct {
+		Message string
+	}
+	Version struct {
+		Name    string `json:"name"`
+		Version string `json:"version"`
+		Error   string `json:"error,omitempty"`
+	}
+	FederationOK bool `json:"FederationOK"`
+}
+
+func (p *MatrixTester) RunCheck(ctx context.Context, options happydns.CheckerOptions, meta map[string]string) (*happydns.CheckResult, error) {
+	var domain string
+
+	if dn, ok := options["serviceDomain"]; ok {
+		domain, _ = dn.(string)
+	}
+
+	if domain == "" {
+		return nil, fmt.Errorf("domain not defined")
+	}
+
+	domain = strings.TrimSuffix(domain, ".")
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, fmt.Sprintf(p.TesterURI, domain), nil)
+	if err != nil {
+		return nil, fmt.Errorf("unable to build the request: %w", err)
+	}
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("unable to perform the test: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 300 {
+		return nil, fmt.Errorf("Sorry, the federation tester is broken. Check on https://federationtester.matrix.org/#%s", strings.TrimSuffix(domain, "."))
+	}
+
+	var status happydns.CheckResultStatus
+	var statusLine string
+	var federationTest FederationTesterResponse
+
+	err = json.NewDecoder(resp.Body).Decode(&federationTest)
+	if err != nil {
+		log.Printf("Error in check_matrix_federation, when decoding json: %s", err.Error())
+		return nil, fmt.Errorf("sorry, the federation tester is broken. Check on https://federationtester.matrix.org/#%s", strings.TrimSuffix(domain, "."))
+	}
+
+	if federationTest.FederationOK {
+		status = happydns.CheckResultStatusOK
+		statusLine = "Running " + federationTest.Version.Name + " " + federationTest.Version.Version
+	} else {
+		status = happydns.CheckResultStatusCritical
+
+		if federationTest.DNSResult.SRVError != nil && federationTest.WellKnownResult.Result != "" {
+			statusLine = fmt.Sprintf("%s OR %s", federationTest.DNSResult.SRVError.Message, federationTest.WellKnownResult.Result)
+		} else if len(federationTest.ConnectionErrors) > 0 {
+			var msg strings.Builder
+			for srv, cerr := range federationTest.ConnectionErrors {
+				if msg.Len() > 0 {
+					msg.WriteString("; ")
+				}
+				msg.WriteString(srv)
+				msg.WriteString(": ")
+				msg.WriteString(cerr.Message)
+			}
+			statusLine = fmt.Sprintf("Connection errors: %s", msg.String())
+		} else if federationTest.WellKnownResult.Server != strings.TrimSuffix(domain, ".") {
+			statusLine = fmt.Sprintf("Bad homeserver_name: got %s, expected %s.", federationTest.WellKnownResult.Server, strings.TrimSuffix(domain, "."))
+		} else {
+			statusLine = fmt.Sprintf("An unimplemented error occurs. Please report this to happydomain team. But know that federation seems to be broken. Check https://federationtester.matrix.org/#%s", strings.TrimSuffix(domain, "."))
+		}
+	}
+
+	return &happydns.CheckResult{
+		Status:     status,
+		StatusLine: statusLine,
+		Report:     federationTest,
+	}, nil
+}
+
+// ── HTML report ───────────────────────────────────────────────────────────────
+
+type matrixCertData struct {
+	SubjectCommonName string
+	IssuerCommonName  string
+	SHA256Fingerprint string
+	DNSNames          []string
+}
+
+type matrixConnectionData struct {
+	Address      string
+	TLSVersion   string
+	CipherSuite  string
+	Certs        []matrixCertData
+	AllChecksOK  bool
+	CheckDetails []matrixCheckItem
+	Errors       []string
+	Open         bool // details element open when checks failed
+}
+
+type matrixCheckItem struct {
+	Label string
+	OK    bool
+}
+
+type matrixConnErrData struct {
+	Address string
+	Message string
+}
+
+type matrixSRVRecord struct {
+	Target   string
+	Port     uint16
+	Priority uint16
+	Weight   uint16
+}
+
+type matrixHostData struct {
+	Name  string
+	CName string
+	Addrs []string
+}
+
+type matrixTemplateData struct {
+	FederationOK     bool
+	Version          string
+	VersionError     string
+	WellKnownServer  string
+	WellKnownResult  string
+	SRVSkipped       bool
+	SRVCName         string
+	SRVRecords       []matrixSRVRecord
+	SRVError         string
+	Hosts            []matrixHostData
+	Addrs            []string
+	Connections      []matrixConnectionData
+	ConnectionErrors []matrixConnErrData
+}
+
+var matrixHTMLTemplate = template.Must(
+	template.New("matrix").Parse(`<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="UTF-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>Matrix Federation Report</title>
+<style>
+*, *::before, *::after { box-sizing: border-box; }
+:root {
+  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+  font-size: 14px;
+  line-height: 1.5;
+  color: #1f2937;
+  background: #f3f4f6;
+}
+body { margin: 0; padding: 1rem; }
+code { font-family: ui-monospace, monospace; font-size: .9em; }
+h2 { font-size: 1rem; font-weight: 700; margin: 0 0 .6rem; }
+h3 { font-size: .9rem; font-weight: 600; margin: 0 0 .4rem; }
+
+.hd {
+  background: #fff;
+  border-radius: 10px;
+  padding: 1rem 1.25rem;
+  margin-bottom: .75rem;
+  box-shadow: 0 1px 3px rgba(0,0,0,.08);
+}
+.hd h1 { margin: 0 0 .4rem; font-size: 1.15rem; font-weight: 700; }
+
+.badge {
+  display: inline-flex; align-items: center;
+  padding: .2em .65em;
+  border-radius: 9999px;
+  font-size: .78rem; font-weight: 700;
+  letter-spacing: .02em;
+}
+.ok   { background: #d1fae5; color: #065f46; }
+.fail { background: #fee2e2; color: #991b1b; }
+
+.version { color: #6b7280; font-size: .82rem; margin-top: .35rem; }
+
+.section {
+  background: #fff;
+  border-radius: 8px;
+  padding: .85rem 1rem;
+  margin-bottom: .6rem;
+  box-shadow: 0 1px 3px rgba(0,0,0,.07);
+}
+
+details {
+  background: #fff;
+  border-radius: 8px;
+  margin-bottom: .45rem;
+  box-shadow: 0 1px 3px rgba(0,0,0,.07);
+  overflow: hidden;
+}
+.section details {
+  box-shadow: none;
+  border-radius: 6px;
+  border: 1px solid #e5e7eb;
+  margin-bottom: .4rem;
+}
+summary {
+  display: flex; align-items: center; gap: .5rem;
+  padding: .65rem 1rem;
+  cursor: pointer;
+  user-select: none;
+  list-style: none;
+}
+summary::-webkit-details-marker { display: none; }
+summary::before {
+  content: "▶";
+  font-size: .65rem;
+  color: #9ca3af;
+  transition: transform .15s;
+  flex-shrink: 0;
+}
+details[open] > summary::before { transform: rotate(90deg); }
+.conn-addr { font-weight: 600; flex: 1; font-size: .9rem; font-family: ui-monospace, monospace; }
+
+.details-body { padding: .6rem 1rem .85rem; border-top: 1px solid #f3f4f6; }
+
+table { border-collapse: collapse; width: 100%; font-size: .85rem; }
+th, td { text-align: left; padding: .3rem .5rem; border-bottom: 1px solid #f3f4f6; }
+th { font-weight: 600; color: #6b7280; }
+
+.check-ok   { color: #059669; }
+.check-fail { color: #dc2626; }
+
+.errmsg { color: #dc2626; font-size: .85rem; margin: .25rem 0 0; }
+.note   { color: #6b7280; font-size: .85rem; }
+
+ul { margin: .25rem 0; padding-left: 1.2rem; }
+li { margin-bottom: .15rem; }
+</style>
+</head>
+<body>
+
+<div class="hd">
+  <h1>Matrix Federation</h1>
+  {{if .FederationOK}}
+  <span class="badge ok">Federation OK</span>
+  {{- else}}
+  <span class="badge fail">Federation FAIL</span>
+  {{- end}}
+  {{if .Version}}<div class="version">Server: <code>{{.Version}}</code>{{if .VersionError}} &mdash; {{.VersionError}}{{end}}</div>{{end}}
+</div>
+
+{{if .Connections}}
+<div class="section">
+  <h2>Connections ({{len .Connections}})</h2>
+  {{range .Connections}}
+  <details{{if .Open}} open{{end}}>
+    <summary>
+      <span class="conn-addr">{{.Address}}</span>
+      {{if .AllChecksOK}}<span class="badge ok">All checks OK</span>{{else}}<span class="badge fail">Checks failed</span>{{end}}
+    </summary>
+    <div class="details-body">
+      {{if or .TLSVersion .CipherSuite}}
+      <h3>TLS</h3>
+      <p class="note">{{.TLSVersion}}{{if and .TLSVersion .CipherSuite}} &mdash; {{end}}{{.CipherSuite}}</p>
+      {{end}}
+
+      {{if .Certs}}
+      <h3>Certificates</h3>
+      <table>
+        <tr><th>Subject</th><th>Issuer</th><th>DNS Names</th><th>Fingerprint (SHA-256)</th></tr>
+        {{range .Certs}}
+        <tr>
+          <td><code>{{.SubjectCommonName}}</code></td>
+          <td><code>{{.IssuerCommonName}}</code></td>
+          <td>{{range .DNSNames}}<code>{{.}}</code> {{end}}</td>
+          <td><code>{{.SHA256Fingerprint}}</code></td>
+        </tr>
+        {{end}}
+      </table>
+      {{end}}
+
+      {{if .CheckDetails}}
+      <h3 style="margin-top:.7rem">Checks</h3>
+      <table>
+        {{range .CheckDetails}}
+        <tr>
+          <td>{{if .OK}}<span class="check-ok">&#10003;</span>{{else}}<span class="check-fail">&#10007;</span>{{end}}</td>
+          <td>{{.Label}}</td>
+        </tr>
+        {{end}}
+      </table>
+      {{end}}
+
+      {{range .Errors}}<p class="errmsg">&#9888; {{.}}</p>{{end}}
+    </div>
+  </details>
+  {{end}}
+</div>
+{{end}}
+
+{{if .ConnectionErrors}}
+<div class="section">
+  <h2>Connection Errors ({{len .ConnectionErrors}})</h2>
+  {{range .ConnectionErrors}}
+  <p><code>{{.Address}}</code><br><span class="errmsg">{{.Message}}</span></p>
+  {{end}}
+</div>
+{{end}}
+
+<div class="section">
+  <h2>Well-Known</h2>
+  {{if .WellKnownServer}}
+  <p>Server: <code>{{.WellKnownServer}}</code></p>
+  {{else if .WellKnownResult}}
+  <p class="note">{{.WellKnownResult}}</p>
+  {{else}}
+  <p class="note">Not found.</p>
+  {{end}}
+</div>
+
+<div class="section">
+  <h2>DNS Resolution</h2>
+  {{if .SRVSkipped}}
+  <p class="note">SRV lookup skipped{{if .SRVCName}} (CNAME: <code>{{.SRVCName}}</code>){{end}}</p>
+  {{else if .SRVError}}
+  <p class="errmsg">SRV error: {{.SRVError}}</p>
+  {{else if .SRVRecords}}
+  <h3>SRV Records</h3>
+  <table>
+    <tr><th>Target</th><th>Port</th><th>Priority</th><th>Weight</th></tr>
+    {{range .SRVRecords}}
+    <tr>
+      <td><code>{{.Target}}</code></td>
+      <td>{{.Port}}</td>
+      <td>{{.Priority}}</td>
+      <td>{{.Weight}}</td>
+    </tr>
+    {{end}}
+  </table>
+  {{else}}
+  <p class="note">No SRV records found.</p>
+  {{end}}
+
+  {{if .Hosts}}
+  <h3 style="margin-top:.6rem">Resolved Hosts</h3>
+  {{range .Hosts}}
+  <p style="margin:.25rem 0">
+    <code>{{.Name}}</code>
+    {{if .CName}} &rarr; <code>{{.CName}}</code>{{end}}
+    {{if .Addrs}}: {{range .Addrs}}<code>{{.}}</code> {{end}}{{end}}
+  </p>
+  {{end}}
+  {{else if .Addrs}}
+  <h3 style="margin-top:.6rem">Addresses</h3>
+  <ul>{{range .Addrs}}<li><code>{{.}}</code></li>{{end}}</ul>
+  {{end}}
+</div>
+
+</body>
+</html>`),
+)
+
+// GetHTMLReport implements happydns.CheckerHTMLReporter.
+func (p *MatrixTester) GetHTMLReport(raw json.RawMessage) (string, error) {
+	var r FederationTesterResponse
+	if err := json.Unmarshal(raw, &r); err != nil {
+		return "", fmt.Errorf("failed to unmarshal matrix report: %w", err)
+	}
+
+	data := matrixTemplateData{
+		FederationOK:    r.FederationOK,
+		WellKnownServer: r.WellKnownResult.Server,
+		WellKnownResult: r.WellKnownResult.Result,
+		SRVSkipped:      r.DNSResult.SRVSkipped,
+		SRVCName:        r.DNSResult.SRVCName,
+		Addrs:           r.DNSResult.Addrs,
+	}
+
+	// Version
+	if r.Version.Name != "" || r.Version.Version != "" {
+		data.Version = strings.TrimSpace(r.Version.Name + " " + r.Version.Version)
+	}
+	data.VersionError = r.Version.Error
+
+	// SRV records
+	for _, s := range r.DNSResult.SRVRecords {
+		data.SRVRecords = append(data.SRVRecords, matrixSRVRecord{
+			Target:   s.Target,
+			Port:     s.Port,
+			Priority: s.Priority,
+			Weight:   s.Weight,
+		})
+	}
+
+	// SRV error
+	if r.DNSResult.SRVError != nil {
+		data.SRVError = r.DNSResult.SRVError.Message
+	}
+
+	// Hosts
+	for name, h := range r.DNSResult.Hosts {
+		data.Hosts = append(data.Hosts, matrixHostData{
+			Name:  name,
+			CName: h.CName,
+			Addrs: h.Addrs,
+		})
+	}
+
+	// Successful connections
+	for addr, cr := range r.ConnectionReports {
+		conn := matrixConnectionData{
+			Address:     addr,
+			TLSVersion:  cr.Cipher.Version,
+			CipherSuite: cr.Cipher.CipherSuite,
+			AllChecksOK: cr.Checks.AllChecksOK,
+			Errors:      cr.Errors,
+			Open:        !cr.Checks.AllChecksOK,
+		}
+		for _, cert := range cr.Certificates {
+			conn.Certs = append(conn.Certs, matrixCertData{
+				SubjectCommonName: cert.SubjectCommonName,
+				IssuerCommonName:  cert.IssuerCommonName,
+				SHA256Fingerprint: cert.SHA256Fingerprint,
+				DNSNames:          cert.DNSNames,
+			})
+		}
+		conn.CheckDetails = []matrixCheckItem{
+			{"Matching server name", cr.Checks.MatchingServerName},
+			{"Certificate valid until future", cr.Checks.FutureValidUntilTS},
+			{"Valid certificates", cr.Checks.ValidCertificates},
+			{"Has Ed25519 key", cr.Checks.HasEd25519Key},
+			{"All Ed25519 checks OK", cr.Checks.AllEd25519ChecksOK},
+		}
+		data.Connections = append(data.Connections, conn)
+	}
+
+	// Failed connections
+	for addr, ce := range r.ConnectionErrors {
+		data.ConnectionErrors = append(data.ConnectionErrors, matrixConnErrData{
+			Address: addr,
+			Message: ce.Message,
+		})
+	}
+
+	var buf strings.Builder
+	if err := matrixHTMLTemplate.Execute(&buf, data); err != nil {
+		return "", fmt.Errorf("failed to render matrix HTML report: %w", err)
+	}
+	return buf.String(), nil
+}

web-admin/routes.go

@@ -109,6 +109,7 @@ func DeclareRoutes(cfg *happydns.Options, router *gin.Engine) {
 
 	// Routes to virtual content
 	router.GET("/auth_users/*_", serveOrReverse("/", cfg))
+	router.GET("/checkers/*_", serveOrReverse("/", cfg))
 	router.GET("/domains/*_", serveOrReverse("/", cfg))
 	router.GET("/providers/*_", serveOrReverse("/", cfg))
 	router.GET("/sessions/*_", serveOrReverse("/", cfg))

web-admin/src/routes/+layout.svelte

@@ -101,6 +101,12 @@
             <NavItem>
                 <NavLink href="/sessions" active={page && page.url.pathname.startsWith('/sessions')}>Sessions</NavLink>
             </NavItem>
+            <NavItem>
+                <NavLink href="/checkers" active={page && page.url.pathname.startsWith('/checkers')}>Checkers</NavLink>
+            </NavItem>
+            <NavItem>
+                <NavLink href="/scheduler" active={page && page.url.pathname.startsWith('/scheduler')}>Scheduler</NavLink>
+            </NavItem>
         </Nav>
     </Collapse>
 </Navbar>

web-admin/src/routes/checkers/+page.svelte

@@ -0,0 +1,150 @@
+<!--
+     This file is part of the happyDomain (R) project.
+     Copyright (c) 2022-2026 happyDomain
+     Authors: Pierre-Olivier Mercier, et al.
+
+     This program is offered under a commercial and under the AGPL license.
+     For commercial licensing, contact us at <contact@happydomain.org>.
+
+     For AGPL licensing:
+     This program is free software: you can redistribute it and/or modify
+     it under the terms of the GNU Affero General Public License as published by
+     the Free Software Foundation, either version 3 of the License, or
+     (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<script lang="ts">
+    import {
+        Card,
+        Col,
+        Container,
+        Icon,
+        Input,
+        InputGroup,
+        InputGroupText,
+        Table,
+        Row,
+        Badge,
+    } from "@sveltestrap/sveltestrap";
+
+    import { getChecks } from "$lib/api-admin";
+
+    let checkersQ = $state(getChecks());
+
+    let searchQuery = $state("");
+</script>
+
+<Container class="flex-fill my-5">
+    <Row class="mb-4">
+        <Col md={8}>
+            <h1 class="display-5">
+                <Icon name="puzzle-fill"></Icon>
+                Checkers
+            </h1>
+            <p class="d-flex gap-3 align-items-center text-muted">
+                <span class="lead"> Manage all checkers </span>
+                {#await checkersQ then checkersR}
+                    <span>Total: {Object.keys(checkersR.data ?? {}).length} checkers</span>
+                {/await}
+            </p>
+        </Col>
+    </Row>
+
+    <Row class="mb-4">
+        <Col md={8} lg={6}>
+            <InputGroup>
+                <InputGroupText>
+                    <Icon name="search"></Icon>
+                </InputGroupText>
+                <Input type="text" placeholder="Search checker..." bind:value={searchQuery} />
+            </InputGroup>
+        </Col>
+    </Row>
+
+    {#await checkersQ}
+        Please wait...
+    {:then checkersR}
+        {@const checkers = checkersR.data}
+        <div class="table-responsive">
+            <Table hover bordered>
+                <thead>
+                    <tr>
+                        <th>Plugin Name</th>
+                        <th>Availability</th>
+                        <th>Actions</th>
+                    </tr>
+                </thead>
+                <tbody>
+                    {#if !checkers || Object.keys(checkers).length == 0}
+                        <tr>
+                            <td colspan="4" class="text-center text-muted py-2">
+                                No checkers available
+                            </td>
+                        </tr>
+                    {:else}
+                        {#each Object.entries(checkers ?? {}).filter(([name, _info]) => name
+                                    .toLowerCase()
+                                    .indexOf(searchQuery.toLowerCase()) > -1) as [checkerName, checkerInfo]}
+                            <tr>
+                                <td><strong>{checkerInfo.name || checkerName}</strong></td>
+                                <td>
+                                    {#if checkerInfo.availability}
+                                        {#if checkerInfo.availability.applyToDomain}
+                                            <Badge color="success">Domain</Badge>
+                                        {/if}
+                                        {#if checkerInfo.availability.limitToProviders && checkerInfo.availability.limitToProviders.length > 0}
+                                            <Badge
+                                                color="primary"
+                                                title={checkerInfo.availability.limitToProviders.join(
+                                                    ", ",
+                                                )}
+                                            >
+                                                Provider-specific
+                                            </Badge>
+                                        {/if}
+                                        {#if checkerInfo.availability.limitToServices && checkerInfo.availability.limitToServices.length > 0}
+                                            <Badge
+                                                color="info"
+                                                title={checkerInfo.availability.limitToServices.join(
+                                                    ", ",
+                                                )}
+                                            >
+                                                Service-specific
+                                            </Badge>
+                                        {/if}
+                                    {:else}
+                                        <Badge color="secondary">General</Badge>
+                                    {/if}
+                                </td>
+                                <td>
+                                    <a
+                                        href="/checkers/{checkerName}"
+                                        class="btn btn-sm btn-primary"
+                                    >
+                                        <Icon name="gear-fill"></Icon>
+                                        Manage
+                                    </a>
+                                </td>
+                            </tr>
+                        {/each}
+                    {/if}
+                </tbody>
+            </Table>
+        </div>
+    {:catch error}
+        <Card body color="danger">
+            <p class="mb-0">
+                <Icon name="exclamation-triangle-fill"></Icon>
+                Error loading checkers: {error.message}
+            </p>
+        </Card>
+    {/await}
+</Container>

web-admin/src/routes/checkers/[cname]/+page.svelte

@@ -0,0 +1,322 @@
+<!--
+     This file is part of the happyDomain (R) project.
+     Copyright (c) 2022-2026 happyDomain
+     Authors: Pierre-Olivier Mercier, et al.
+
+     This program is offered under a commercial and under the AGPL license.
+     For commercial licensing, contact us at <contact@happydomain.org>.
+
+     For AGPL licensing:
+     This program is free software: you can redistribute it and/or modify
+     it under the terms of the GNU Affero General Public License as published by
+     the Free Software Foundation, either version 3 of the License, or
+     (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<script lang="ts">
+    import {
+        Alert,
+        Badge,
+        Button,
+        Card,
+        CardBody,
+        CardHeader,
+        Col,
+        Container,
+        Form,
+        FormGroup,
+        Icon,
+        Row,
+    } from "@sveltestrap/sveltestrap";
+    import { page } from "$app/state";
+
+    import { toasts } from "$lib/stores/toasts";
+    import { getChecksByCnameOptions, putChecksByCnameOptions } from "$lib/api-admin";
+    import { getCheckStatus } from "$lib/api/checks";
+    import Resource from "$lib/components/inputs/Resource.svelte";
+    import CheckerOptionsGroups from "$lib/components/checkers/CheckerOptionsGroups.svelte";
+
+    let cname = $derived(page.params.cname!);
+
+    let checkerStatusQ = $derived(getCheckStatus(cname));
+    let checkerOptionsQ = $derived(getChecksByCnameOptions({ path: { cname } }));
+    let optionValues = $state<Record<string, any>>({});
+    let saving = $state(false);
+
+    $effect(() => {
+        checkerOptionsQ.then((optionsR) => {
+            optionValues = { ...((optionsR.data as Record<string, unknown>) || {}) };
+        });
+    });
+
+    async function saveOptions() {
+        saving = true;
+        try {
+            await putChecksByCnameOptions({
+                path: { cname },
+                body: { options: optionValues },
+            });
+            checkerOptionsQ = getChecksByCnameOptions({ path: { cname } });
+            toasts.addToast({
+                message: `Plugin options updated successfully`,
+                type: "success",
+                timeout: 5000,
+            });
+        } catch (error) {
+            toasts.addErrorToast({
+                message: "Failed to update options: " + error,
+                timeout: 10000,
+            });
+        } finally {
+            saving = false;
+        }
+    }
+
+    async function cleanOrphanedOptions(adminOpts: any[]) {
+        const validOptIds = new Set(adminOpts.map((opt) => opt.id));
+        const cleanedOptions: Record<string, any> = {};
+
+        for (const [key, value] of Object.entries(optionValues)) {
+            if (validOptIds.has(key)) {
+                cleanedOptions[key] = value;
+            }
+        }
+
+        saving = true;
+        try {
+            await putChecksByCnameOptions({
+                path: { cname },
+                body: { options: cleanedOptions },
+            });
+            checkerOptionsQ = getChecksByCnameOptions({ path: { cname } });
+            toasts.addToast({
+                message: `Orphaned options removed successfully`,
+                type: "success",
+                timeout: 5000,
+            });
+        } catch (error) {
+            toasts.addErrorToast({
+                message: "Failed to clean options: " + error,
+                timeout: 10000,
+            });
+        } finally {
+            saving = false;
+        }
+    }
+
+    function getOrphanedOptions(adminOpts: any[]): string[] {
+        const validOptIds = new Set(adminOpts.map((opt) => opt.id));
+        return Object.keys(optionValues).filter((key) => !validOptIds.has(key));
+    }
+</script>
+
+<Container class="flex-fill my-5">
+    <Row class="mb-4">
+        <Col>
+            <Button color="link" href="/checks" class="mb-2">
+                <Icon name="arrow-left"></Icon>
+                Back to checkers
+            </Button>
+            <h1 class="display-5">
+                <Icon name="puzzle-fill"></Icon>
+                {cname}
+            </h1>
+        </Col>
+    </Row>
+
+    {#await checkerStatusQ}
+        <Card body>
+            <p class="text-center mb-0">
+                <span class="spinner-border spinner-border-sm me-2"></span>
+                Loading checker status...
+            </p>
+        </Card>
+    {:then status}
+        {#if status}
+            <Row class="mb-4">
+                <Col md={6}>
+                    <Card>
+                        <CardHeader>
+                            <strong>Checker Information</strong>
+                        </CardHeader>
+                        <CardBody>
+                            <dl class="row mb-0">
+                                <dt class="col-sm-4">Name:</dt>
+                                <dd class="col-sm-8">{status.name}</dd>
+
+                                <dt class="col-sm-4">Availability:</dt>
+                                <dd class="col-sm-8">
+                                    {#if status.availableOn}
+                                        <div class="d-flex flex-wrap gap-1">
+                                            {#if status.availableOn.applyToDomain}
+                                                <Badge color="success">Domain-level</Badge>
+                                            {/if}
+                                            {#if status.availableOn.limitToProviders && status.availableOn.limitToProviders.length > 0}
+                                                <Badge color="primary">
+                                                    Providers: {status.availableOn.limitToProviders.join(
+                                                        ", ",
+                                                    )}
+                                                </Badge>
+                                            {/if}
+                                            {#if status.availableOn.limitToServices && status.availableOn.limitToServices.length > 0}
+                                                <Badge color="info">
+                                                    Services: {status.availableOn.limitToServices.join(
+                                                        ", ",
+                                                    )}
+                                                </Badge>
+                                            {/if}
+                                            {#if !status.availableOn.applyToDomain && (!status.availableOn.limitToProviders || status.availableOn.limitToProviders.length === 0) && (!status.availableOn.limitToServices || status.availableOn.limitToServices.length === 0)}
+                                                <Badge color="secondary">General</Badge>
+                                            {/if}
+                                        </div>
+                                    {:else}
+                                        <Badge color="secondary">General</Badge>
+                                    {/if}
+                                </dd>
+                            </dl>
+                        </CardBody>
+                    </Card>
+                </Col>
+
+                <Col md={6}>
+                    {#await checkerOptionsQ}
+                        <Card>
+                            <CardBody>
+                                <p class="text-center mb-0">
+                                    <span class="spinner-border spinner-border-sm me-2"></span>
+                                    Loading options...
+                                </p>
+                            </CardBody>
+                        </Card>
+                    {:then _optionsR}
+                        {@const adminOpts = status.options?.adminOpts || []}
+                        {@const readOnlyOptGroups = [
+                            {
+                                key: "userOpts",
+                                label: "User Options",
+                                opts: status.options?.userOpts || [],
+                            },
+                            {
+                                key: "domainOpts",
+                                label: "Domain Options",
+                                opts: status.options?.domainOpts || [],
+                            },
+                            {
+                                key: "serviceOpts",
+                                label: "Service Options",
+                                opts: status.options?.serviceOpts || [],
+                            },
+                            {
+                                key: "runOpts",
+                                label: "Run Options",
+                                opts: status.options?.runOpts || [],
+                            },
+                        ]}
+                        {@const hasAnyOpts =
+                            adminOpts.length > 0 ||
+                            readOnlyOptGroups.some((g) => g.opts.length > 0)}
+                        {@const orphanedOpts = getOrphanedOptions(adminOpts)}
+
+                        {#if orphanedOpts.length > 0}
+                            <Alert color="warning" class="mb-3">
+                                <div class="d-flex justify-content-between align-items-center">
+                                    <div>
+                                        <Icon name="exclamation-triangle-fill"></Icon>
+                                        <strong>Orphaned options detected:</strong>
+                                        {orphanedOpts.join(", ")}
+                                    </div>
+                                    <Button
+                                        color="danger"
+                                        size="sm"
+                                        onclick={() => cleanOrphanedOptions(adminOpts)}
+                                        disabled={saving}
+                                    >
+                                        <Icon name="trash"></Icon>
+                                        Clean Up
+                                    </Button>
+                                </div>
+                            </Alert>
+                        {/if}
+
+                        {#if adminOpts.length > 0}
+                            <Card class="mb-3">
+                                <CardHeader>
+                                    <strong>Admin Options</strong>
+                                </CardHeader>
+                                <CardBody>
+                                    <Form on:submit={saveOptions}>
+                                        {#each adminOpts as optDoc}
+                                            {#if optDoc.id}
+                                                {@const optName = optDoc.id}
+                                                <FormGroup>
+                                                    <Resource
+                                                        edit={true}
+                                                        index={optName}
+                                                        specs={optDoc}
+                                                        type={optDoc.type || "string"}
+                                                        bind:value={optionValues[optName]}
+                                                    />
+                                                </FormGroup>
+                                            {/if}
+                                        {/each}
+                                        <div class="d-flex gap-2">
+                                            <Button type="submit" color="success" disabled={saving}>
+                                                {#if saving}
+                                                    <span
+                                                        class="spinner-border spinner-border-sm me-1"
+                                                    ></span>
+                                                {/if}
+                                                <Icon name="check-circle"></Icon>
+                                                Save Changes
+                                            </Button>
+                                        </div>
+                                    </Form>
+                                </CardBody>
+                            </Card>
+                        {/if}
+
+                        <CheckerOptionsGroups groups={readOnlyOptGroups} />
+
+                        {#if !hasAnyOpts}
+                            <Card>
+                                <CardBody>
+                                    <Alert color="info" class="mb-0">
+                                        <Icon name="info-circle"></Icon>
+                                        This checker has no configurable options.
+                                    </Alert>
+                                </CardBody>
+                            </Card>
+                        {/if}
+                    {:catch error}
+                        <Card>
+                            <CardBody>
+                                <Alert color="danger" class="mb-0">
+                                    <Icon name="exclamation-triangle-fill"></Icon>
+                                    Error loading options: {error.message}
+                                </Alert>
+                            </CardBody>
+                        </Card>
+                    {/await}
+                </Col>
+            </Row>
+        {:else}
+            <Alert color="danger">
+                <Icon name="exclamation-triangle-fill"></Icon>
+                Error: checker data not found
+            </Alert>
+        {/if}
+    {:catch error}
+        <Alert color="danger">
+            <Icon name="exclamation-triangle-fill"></Icon>
+            Error loading checker: {error.message}
+        </Alert>
+    {/await}
+</Container>

web-admin/src/routes/scheduler/+page.svelte

@@ -0,0 +1,341 @@
+<!--
+     This file is part of the happyDomain (R) project.
+     Copyright (c) 2022-2026 happyDomain
+     Authors: Pierre-Olivier Mercier, et al.
+
+     This program is offered under a commercial and under the AGPL license.
+     For commercial licensing, contact us at <contact@happydomain.org>.
+
+     For AGPL licensing:
+     This program is free software: you can redistribute it and/or modify
+     it under the terms of the GNU Affero General Public License as published by
+     the Free Software Foundation, either version 3 of the License, or
+     (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<script lang="ts">
+    import { onMount } from "svelte";
+    import {
+        Badge,
+        Button,
+        Card,
+        CardBody,
+        CardHeader,
+        Col,
+        Container,
+        Icon,
+        Row,
+        Spinner,
+        Table,
+    } from "@sveltestrap/sveltestrap";
+
+    import { toasts } from "$lib/stores/toasts";
+    import {
+        getScheduler,
+        postSchedulerDisable,
+        postSchedulerEnable,
+        postSchedulerRescheduleUpcoming,
+    } from "$lib/api-admin/sdk.gen";
+
+    interface CheckerSchedule {
+        id: string;
+        checker_name: string;
+        owner_id: string;
+        target_type: number;
+        target_id: string;
+        interval: number;
+        enabled: boolean;
+        last_run?: string;
+        next_run: string;
+    }
+
+    interface SchedulerStatus {
+        config_enabled: boolean;
+        runtime_enabled: boolean;
+        running: boolean;
+        worker_count: number;
+        queue_size: number;
+        active_count: number;
+        next_schedules: CheckerSchedule[] | null;
+    }
+
+    let status = $state<SchedulerStatus | null>(null);
+    let loading = $state(true);
+    let actionInProgress = $state(false);
+    let rescheduleInProgress = $state(false);
+    let error = $state<string | null>(null);
+
+    async function fetchStatus() {
+        loading = true;
+        error = null;
+        try {
+            const { data, error: err } = await getScheduler();
+            if (err) throw new Error(String(err));
+            status = data as SchedulerStatus;
+        } catch (e: any) {
+            error = e.message ?? "Unknown error";
+        } finally {
+            loading = false;
+        }
+    }
+
+    async function setEnabled(enabled: boolean) {
+        actionInProgress = true;
+        const action = enabled ? "enable" : "disable";
+        try {
+            const { data, error: err } = await (enabled
+                ? postSchedulerEnable()
+                : postSchedulerDisable());
+            if (err) {
+                toasts.addErrorToast({ message: `Failed to ${action} scheduler: ${err}` });
+                return;
+            }
+            status = data as SchedulerStatus;
+            toasts.addToast({ message: `Scheduler ${action}d successfully`, color: "success" });
+        } catch (e: any) {
+            toasts.addErrorToast({ message: e.message ?? `Failed to ${action} scheduler` });
+        } finally {
+            actionInProgress = false;
+        }
+    }
+
+    async function rescheduleUpcoming() {
+        rescheduleInProgress = true;
+        try {
+            const { data, error: err } = await postSchedulerRescheduleUpcoming();
+            if (err) {
+                toasts.addErrorToast({ message: `Failed to reschedule: ${err}` });
+                return;
+            }
+            toasts.addToast({
+                message: `Rescheduled ${(data as any).rescheduled} schedule(s) successfully`,
+                color: "success",
+            });
+            await fetchStatus();
+        } catch (e: any) {
+            toasts.addErrorToast({ message: e.message ?? "Failed to reschedule upcoming checks" });
+        } finally {
+            rescheduleInProgress = false;
+        }
+    }
+
+    function formatDuration(ns: number): string {
+        const seconds = ns / 1e9;
+        if (seconds < 60) return `${Math.round(seconds)}s`;
+        const minutes = seconds / 60;
+        if (minutes < 60) return `${Math.round(minutes)}m`;
+        const hours = minutes / 60;
+        if (hours < 24) return `${Math.round(hours)}h`;
+        return `${Math.round(hours / 24)}d`;
+    }
+
+    function targetTypeName(t: number): string {
+        const names: Record<number, string> = {
+            0: "instance",
+            1: "user",
+            2: "domain",
+            3: "zone",
+            4: "service",
+            5: "ondemand",
+        };
+        return names[t] ?? "unknown";
+    }
+
+    onMount(fetchStatus);
+</script>
+
+<Container class="flex-fill my-5">
+    <Row class="mb-4">
+        <Col>
+            <h1 class="display-5">
+                <Icon name="clock-history"></Icon>
+                Test Scheduler
+            </h1>
+            <p class="text-muted lead">Monitor and control the background test scheduler</p>
+        </Col>
+    </Row>
+
+    {#if loading}
+        <div class="d-flex align-items-center gap-2">
+            <Spinner size="sm" />
+            <span>Loading scheduler status...</span>
+        </div>
+    {:else if error}
+        <Card color="danger" body>
+            <Icon name="exclamation-triangle-fill"></Icon>
+            Error loading scheduler status: {error}
+            <Button class="ms-3" size="sm" color="light" onclick={fetchStatus}>Retry</Button>
+        </Card>
+    {:else if status}
+        <!-- Status Card -->
+        <Card class="mb-4">
+            <CardHeader>
+                <div class="d-flex justify-content-between align-items-center">
+                    <span><Icon name="info-circle-fill"></Icon> Scheduler Status</span>
+                    <Button size="sm" color="secondary" outline onclick={fetchStatus}>
+                        <Icon name="arrow-clockwise"></Icon> Refresh
+                    </Button>
+                </div>
+            </CardHeader>
+            <CardBody>
+                <Row class="g-3 mb-3">
+                    <Col sm={6} md={4}>
+                        <div class="text-muted small">Config Enabled</div>
+                        {#if status.config_enabled}
+                            <Badge color="success">Yes</Badge>
+                        {:else}
+                            <Badge color="danger">No</Badge>
+                        {/if}
+                    </Col>
+                    <Col sm={6} md={4}>
+                        <div class="text-muted small">Runtime Enabled</div>
+                        {#if status.runtime_enabled}
+                            <Badge color="success">Yes</Badge>
+                        {:else}
+                            <Badge color="warning">Disabled</Badge>
+                        {/if}
+                    </Col>
+                    <Col sm={6} md={4}>
+                        <div class="text-muted small">Running</div>
+                        {#if status.running}
+                            <Badge color="success"><Icon name="play-fill"></Icon> Running</Badge>
+                        {:else}
+                            <Badge color="secondary"><Icon name="stop-fill"></Icon> Stopped</Badge>
+                        {/if}
+                    </Col>
+                    <Col sm={6} md={4}>
+                        <div class="text-muted small">Workers</div>
+                        <strong>{status.worker_count}</strong>
+                    </Col>
+                    <Col sm={6} md={4}>
+                        <div class="text-muted small">Queue Size</div>
+                        <strong>{status.queue_size}</strong>
+                    </Col>
+                    <Col sm={6} md={4}>
+                        <div class="text-muted small">Active Executions</div>
+                        <strong>{status.active_count}</strong>
+                    </Col>
+                </Row>
+
+                {#if status.config_enabled}
+                    <div class="d-flex gap-2">
+                        {#if status.runtime_enabled}
+                            <Button
+                                color="warning"
+                                disabled={actionInProgress}
+                                onclick={() => setEnabled(false)}
+                            >
+                                {#if actionInProgress}<Spinner size="sm" />{:else}<Icon
+                                        name="pause-fill"
+                                    ></Icon>{/if}
+                                Disable Scheduler
+                            </Button>
+                        {:else}
+                            <Button
+                                color="success"
+                                disabled={actionInProgress}
+                                onclick={() => setEnabled(true)}
+                            >
+                                {#if actionInProgress}<Spinner size="sm" />{:else}<Icon
+                                        name="play-fill"
+                                    ></Icon>{/if}
+                                Enable Scheduler
+                            </Button>
+                        {/if}
+                        <Button
+                            color="secondary"
+                            outline
+                            disabled={rescheduleInProgress}
+                            onclick={rescheduleUpcoming}
+                        >
+                            {#if rescheduleInProgress}<Spinner size="sm" />{:else}<Icon
+                                    name="shuffle"
+                                ></Icon>{/if}
+                            Spread Upcoming Checks
+                        </Button>
+                    </div>
+                {:else}
+                    <p class="text-muted mb-0">
+                        <Icon name="lock-fill"></Icon>
+                        The scheduler is disabled in the server configuration and cannot be enabled at
+                        runtime.
+                    </p>
+                {/if}
+            </CardBody>
+        </Card>
+
+        <!-- Upcoming Scheduled Checks -->
+        <Card>
+            <CardHeader>
+                <Icon name="calendar-event-fill"></Icon>
+                Upcoming Scheduled Checks
+                {#if status.next_schedules}
+                    <Badge color="secondary" class="ms-2">{status.next_schedules.length}</Badge>
+                {/if}
+            </CardHeader>
+            <CardBody class="p-0">
+                <div class="table-responsive">
+                    <Table hover class="mb-0">
+                        <thead>
+                            <tr>
+                                <th>Plugin</th>
+                                <th>Target Type</th>
+                                <th>Target ID</th>
+                                <th>Interval</th>
+                                <th>Last Run</th>
+                                <th>Next Run</th>
+                            </tr>
+                        </thead>
+                        <tbody>
+                            {#if !status.next_schedules || status.next_schedules.length === 0}
+                                <tr>
+                                    <td colspan="6" class="text-center text-muted py-3">
+                                        No scheduled checks
+                                    </td>
+                                </tr>
+                            {:else}
+                                {#each status.next_schedules as schedule}
+                                    <tr>
+                                        <td><strong>{schedule.checker_name}</strong></td>
+                                        <td
+                                            ><Badge color="info"
+                                                >{targetTypeName(schedule.target_type)}</Badge
+                                            ></td
+                                        >
+                                        <td><code class="small">{schedule.target_id}</code></td>
+                                        <td>{formatDuration(schedule.interval)}</td>
+                                        <td>
+                                            {#if schedule.last_run}
+                                                {new Date(schedule.last_run).toLocaleString()}
+                                            {:else}
+                                                <span class="text-muted">Never</span>
+                                            {/if}
+                                        </td>
+                                        <td>
+                                            {#if new Date(schedule.next_run) < new Date()}
+                                                <span class="text-danger">
+                                                    <Icon name="exclamation-circle-fill"></Icon>
+                                                    {new Date(schedule.next_run).toLocaleString()}
+                                                </span>
+                                            {:else}
+                                                {new Date(schedule.next_run).toLocaleString()}
+                                            {/if}
+                                        </td>
+                                    </tr>
+                                {/each}
+                            {/if}
+                        </tbody>
+                    </Table>
+                </div>
+            </CardBody>
+        </Card>
+    {/if}
+</Container>

web/package-lock.json

@@ -13,6 +13,9 @@
 				"@sveltestrap/sveltestrap": "^7.0.0",
 				"bootstrap": "^5.3.0",
 				"bootstrap-icons": "^1.13.0",
+				"chart.js": "^4.5.1",
+				"chartjs-adapter-date-fns": "^3.0.0",
+				"date-fns": "^4.1.0",
 				"highlight.js": "^11.11.1",
 				"html-escaper": "^3.0.0",
 				"sass": "^1.97.0",
@@ -864,6 +867,12 @@
 			"integrity": "sha512-4JQNk+3mVzK3xh2rqd6RB4J46qUR19azEHBneZyTZM+c456qOrbbM/5xcR8huNCCcbVt7+UmizG6GuUvPvKUYg==",
 			"license": "MIT"
 		},
+		"node_modules/@kurkle/color": {
+			"version": "0.3.4",
+			"resolved": "https://registry.npmjs.org/@kurkle/color/-/color-0.3.4.tgz",
+			"integrity": "sha512-M5UknZPHRu3DEDWoipU6sE8PdkZ6Z/S+v4dD+Ke8IaNlpdSQah50lz1KtcFBa2vsdOnwbbnxJwVM4wty6udA5w==",
+			"license": "MIT"
+		},
 		"node_modules/@noble/hashes": {
 			"version": "2.0.1",
 			"resolved": "https://registry.npmjs.org/@noble/hashes/-/hashes-2.0.1.tgz",
@@ -2374,6 +2383,29 @@
 				"url": "https://github.com/chalk/chalk?sponsor=1"
 			}
 		},
+		"node_modules/chart.js": {
+			"version": "4.5.1",
+			"resolved": "https://registry.npmjs.org/chart.js/-/chart.js-4.5.1.tgz",
+			"integrity": "sha512-GIjfiT9dbmHRiYi6Nl2yFCq7kkwdkp1W/lp2J99rX0yo9tgJGn3lKQATztIjb5tVtevcBtIdICNWqlq5+E8/Pw==",
+			"license": "MIT",
+			"peer": true,
+			"dependencies": {
+				"@kurkle/color": "^0.3.0"
+			},
+			"engines": {
+				"pnpm": ">=8"
+			}
+		},
+		"node_modules/chartjs-adapter-date-fns": {
+			"version": "3.0.0",
+			"resolved": "https://registry.npmjs.org/chartjs-adapter-date-fns/-/chartjs-adapter-date-fns-3.0.0.tgz",
+			"integrity": "sha512-Rs3iEB3Q5pJ973J93OBTpnP7qoGwvq3nUnoMdtxO+9aoJof7UFcRbWcIDteXuYd1fgAvct/32T9qaLyLuZVwCg==",
+			"license": "MIT",
+			"peerDependencies": {
+				"chart.js": ">=2.8.0",
+				"date-fns": ">=2.0.0"
+			}
+		},
 		"node_modules/chokidar": {
 			"version": "5.0.0",
 			"resolved": "https://registry.npmjs.org/chokidar/-/chokidar-5.0.0.tgz",
@@ -2512,6 +2544,17 @@
 				"node": ">=4"
 			}
 		},
+		"node_modules/date-fns": {
+			"version": "4.1.0",
+			"resolved": "https://registry.npmjs.org/date-fns/-/date-fns-4.1.0.tgz",
+			"integrity": "sha512-Ukq0owbQXxa/U3EGtsdVBkR1w7KOQ5gIBqdH2hkvknzZPYvBxb/aa6E8L7tmjFtkwZBu3UXBbjIgPo/Ez4xaNg==",
+			"license": "MIT",
+			"peer": true,
+			"funding": {
+				"type": "github",
+				"url": "https://github.com/sponsors/kossnocorp"
+			}
+		},
 		"node_modules/debug": {
 			"version": "4.4.3",
 			"resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",

web/package.json

@@ -45,6 +45,9 @@
 		"@sveltestrap/sveltestrap": "^7.0.0",
 		"bootstrap": "^5.3.0",
 		"bootstrap-icons": "^1.13.0",
+		"chart.js": "^4.5.1",
+		"chartjs-adapter-date-fns": "^3.0.0",
+		"date-fns": "^4.1.0",
 		"highlight.js": "^11.11.1",
 		"html-escaper": "^3.0.0",
 		"sass": "^1.97.0",

web/routes.go

@@ -131,6 +131,7 @@ func DeclareRoutes(cfg *happydns.Options, router *gin.RouterGroup, captchaVerifi
 	router.GET("/service-worker.js", serveFile)
 
 	// Routes to virtual content
+	router.GET("/checkers/*_", serveIndex)
 	router.GET("/domains/*_", serveIndex)
 	router.GET("/email-validation", serveIndex)
 	router.GET("/forgotten-password", serveIndex)

web/src/lib/api/checkers.ts

@@ -0,0 +1,582 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2022-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+import {
+    getChecks,
+    getChecksByCname,
+    getChecksByCnameOptions,
+    postChecksByCnameOptions,
+    putChecksByCnameOptions,
+    getChecksByCnameOptionsByOptname,
+    putChecksByCnameOptionsByOptname,
+    postDomainsByDomainChecksByCname,
+    getDomainsByDomainChecksByCnameOptions,
+    postDomainsByDomainChecksByCnameOptions,
+    putDomainsByDomainChecksByCnameOptions,
+    getDomainsByDomainChecks,
+    getDomainsByDomainChecksByCnameResults,
+    getDomainsByDomainChecksByCnameResultsByResultId,
+    getDomainsByDomainChecksByCnameResultsByResultIdReport,
+    deleteDomainsByDomainChecksByCnameResults,
+    deleteDomainsByDomainChecksByCnameResultsByResultId,
+    getDomainsByDomainChecksByCnameExecutionsByExecutionId,
+    postPluginsTestsSchedules,
+    putPluginsTestsSchedulesByScheduleId,
+    getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecks,
+    postDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCname,
+    getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameExecutionsByExecutionId,
+    getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameOptions,
+    postDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameOptions,
+    putDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameOptions,
+    getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameResults,
+    getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameResultsByResultId,
+    deleteDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameResultsByResultId,
+    deleteDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameResults,
+    getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameResultsByResultIdReport,
+    getDomainsByDomainChecksByCnameMetrics,
+    getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameMetrics,
+    getDomainsByDomainChecksByCnameResultsByResultIdMetrics,
+    getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameResultsByResultIdMetrics,
+} from "$lib/api-base/sdk.gen";
+import { unwrapSdkResponse } from "./errors";
+import type {
+    CheckerList,
+    CheckerInfo,
+    CheckerOptions,
+    AvailableChecker,
+    CheckerSchedule,
+    CheckResult,
+    CheckExecution,
+    CheckScopeType,
+    MetricsReport,
+} from "$lib/model/checker";
+
+export async function listCheckers(): Promise<CheckerList> {
+    return unwrapSdkResponse(await getChecks()) as CheckerList;
+}
+
+export async function getCheckStatus(checkId: string): Promise<CheckerInfo> {
+    return unwrapSdkResponse(
+        await getChecksByCname({
+            path: { cname: checkId },
+        }),
+    ) as unknown as CheckerInfo;
+}
+
+export async function getCheckOptions(checkId: string): Promise<CheckerOptions> {
+    return unwrapSdkResponse(
+        await getChecksByCnameOptions({
+            path: { cname: checkId },
+        }),
+    ) as CheckerOptions;
+}
+
+export async function addCheckOptions(checkId: string, options: CheckerOptions): Promise<boolean> {
+    return unwrapSdkResponse(
+        await postChecksByCnameOptions({
+            path: { cname: checkId },
+            body: { options } as any,
+        }),
+    ) as boolean;
+}
+
+export async function updateCheckOptions(
+    checkId: string,
+    options: CheckerOptions,
+): Promise<boolean> {
+    return unwrapSdkResponse(
+        await putChecksByCnameOptions({
+            path: { cname: checkId },
+            body: { options } as any,
+        }),
+    ) as boolean;
+}
+
+export async function getCheckOption(checkId: string, optionName: string): Promise<any> {
+    return unwrapSdkResponse(
+        await getChecksByCnameOptionsByOptname({
+            path: { cname: checkId, optname: optionName },
+        }),
+    );
+}
+
+export async function setcheckOption(
+    checkId: string,
+    optionName: string,
+    value: any,
+): Promise<boolean> {
+    return unwrapSdkResponse(
+        await putChecksByCnameOptionsByOptname({
+            path: { cname: checkId, optname: optionName },
+            body: value as any,
+        }),
+    ) as boolean;
+}
+
+export async function getDomainCheckOptions(
+    domainId: string,
+    checkId: string,
+): Promise<CheckerOptions> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainChecksByCnameOptions({
+            path: { domain: domainId, cname: checkId },
+        }),
+    ) as CheckerOptions;
+}
+
+export async function addDomainCheckOptions(
+    domainId: string,
+    checkId: string,
+    options: CheckerOptions,
+): Promise<boolean> {
+    return unwrapSdkResponse(
+        await postDomainsByDomainChecksByCnameOptions({
+            path: { domain: domainId, cname: checkId },
+            body: { options } as any,
+        }),
+    ) as boolean;
+}
+
+export async function updateDomainCheckOptions(
+    domainId: string,
+    checkId: string,
+    options: CheckerOptions,
+): Promise<boolean> {
+    return unwrapSdkResponse(
+        await putDomainsByDomainChecksByCnameOptions({
+            path: { domain: domainId, cname: checkId },
+            body: { options } as any,
+        }),
+    ) as boolean;
+}
+
+export async function triggerCheck(
+    domainId: string,
+    checkId: string,
+    options?: CheckerOptions,
+): Promise<{ execution_id?: string }> {
+    const filteredOptions = options
+        ? Object.fromEntries(
+              Object.entries(options).filter(([, v]) => v !== "" && v !== null && v !== undefined),
+          )
+        : undefined;
+    return unwrapSdkResponse(
+        await postDomainsByDomainChecksByCname({
+            path: { domain: domainId, cname: checkId },
+            body: { options: filteredOptions } as any,
+        }),
+    ) as { execution_id?: string };
+}
+
+export async function listAvailableCheckers(domainId: string): Promise<AvailableChecker[]> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainChecks({
+            path: { domain: domainId },
+        }),
+    ) as unknown as AvailableChecker[];
+}
+
+export async function createCheckSchedule(data: {
+    checker_name: string;
+    target_type: CheckScopeType;
+    target_id: string;
+    interval: number;
+    enabled: boolean;
+    options?: CheckerOptions;
+}): Promise<CheckerSchedule> {
+    return unwrapSdkResponse(
+        await postPluginsTestsSchedules({
+            body: {
+                checker_name: data.checker_name,
+                target_type: data.target_type,
+                target_id: data.target_id,
+                interval: data.interval,
+                enabled: data.enabled,
+                options: data.options,
+            },
+        }),
+    );
+}
+
+export async function updateCheckSchedule(
+    scheduleId: string,
+    schedule: CheckerSchedule,
+): Promise<CheckerSchedule> {
+    return unwrapSdkResponse(
+        await putPluginsTestsSchedulesByScheduleId({
+            path: { schedule_id: scheduleId },
+            body: {
+                id: schedule.id,
+                checker_name: schedule.checker_name,
+                target_type: schedule.target_type,
+                target_id: schedule.target_id,
+                interval: schedule.interval,
+                enabled: schedule.enabled,
+                last_run: schedule.last_run,
+                next_run: schedule.next_run,
+                options: schedule.options,
+            },
+        }),
+    );
+}
+export async function getCheckResult(
+    domainId: string,
+    checkName: string,
+    resultId: string,
+): Promise<CheckResult> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainChecksByCnameResultsByResultId({
+            path: { domain: domainId, cname: checkName, result_id: resultId },
+        }),
+    ) as unknown as CheckResult;
+}
+
+export async function deleteCheckResult(
+    domainId: string,
+    checkName: string,
+    resultId: string,
+): Promise<void> {
+    await deleteDomainsByDomainChecksByCnameResultsByResultId({
+        path: { domain: domainId, cname: checkName, result_id: resultId },
+    });
+}
+
+export async function listCheckResults(
+    domainId: string,
+    checkName: string,
+): Promise<CheckResult[]> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainChecksByCnameResults({
+            path: { domain: domainId, cname: checkName },
+        }),
+    ) as unknown as CheckResult[];
+}
+
+export async function deleteAllCheckResults(domainId: string, checkName: string): Promise<void> {
+    await deleteDomainsByDomainChecksByCnameResults({
+        path: { domain: domainId, cname: checkName },
+    });
+}
+
+export async function getCheckResultHTMLReport(
+    domainId: string,
+    checkName: string,
+    resultId: string,
+): Promise<string> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainChecksByCnameResultsByResultIdReport({
+            path: { domain: domainId, cname: checkName, result_id: resultId },
+        }),
+    ) as string;
+}
+
+export async function getCheckExecution(
+    domainId: string,
+    checkName: string,
+    executionId: string,
+): Promise<CheckExecution> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainChecksByCnameExecutionsByExecutionId({
+            path: { domain: domainId, cname: checkName, execution_id: executionId },
+        }),
+    ) as unknown as CheckExecution;
+}
+
+// --- Service-scoped check API functions ---
+
+export async function listServiceAvailableCheckers(
+    domainId: string,
+    zoneId: string,
+    subdomain: string,
+    serviceid: string,
+): Promise<AvailableChecker[]> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecks({
+            path: { domain: domainId, zoneid: zoneId, subdomain, serviceid },
+        }),
+    ) as unknown as AvailableChecker[];
+}
+
+export async function triggerServiceCheck(
+    domainId: string,
+    zoneId: string,
+    subdomain: string,
+    serviceid: string,
+    checkId: string,
+    options?: CheckerOptions,
+): Promise<{ execution_id?: string }> {
+    const filteredOptions = options
+        ? Object.fromEntries(
+              Object.entries(options).filter(([, v]) => v !== "" && v !== null && v !== undefined),
+          )
+        : undefined;
+    return unwrapSdkResponse(
+        await postDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCname({
+            path: { domain: domainId, zoneid: zoneId, subdomain, serviceid, cname: checkId } as any,
+            body: { options: filteredOptions } as any,
+        }),
+    ) as { execution_id?: string };
+}
+
+export async function getServiceCheckExecution(
+    domainId: string,
+    zoneId: string,
+    subdomain: string,
+    serviceid: string,
+    checkName: string,
+    executionId: string,
+): Promise<CheckExecution> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameExecutionsByExecutionId(
+            {
+                path: {
+                    domain: domainId,
+                    zoneid: zoneId,
+                    subdomain,
+                    serviceid,
+                    cname: checkName,
+                    execution_id: executionId,
+                } as any,
+            },
+        ),
+    ) as unknown as CheckExecution;
+}
+
+export async function getServiceCheckOptions(
+    domainId: string,
+    zoneId: string,
+    subdomain: string,
+    serviceid: string,
+    checkId: string,
+): Promise<CheckerOptions> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameOptions({
+            path: { domain: domainId, zoneid: zoneId, subdomain, serviceid, cname: checkId } as any,
+        }),
+    ) as CheckerOptions;
+}
+
+export async function addServiceCheckOptions(
+    domainId: string,
+    zoneId: string,
+    subdomain: string,
+    serviceid: string,
+    checkId: string,
+    options: CheckerOptions,
+): Promise<boolean> {
+    return unwrapSdkResponse(
+        await postDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameOptions({
+            path: { domain: domainId, zoneid: zoneId, subdomain, serviceid, cname: checkId } as any,
+            body: { options } as any,
+        }),
+    ) as boolean;
+}
+
+export async function updateServiceCheckOptions(
+    domainId: string,
+    zoneId: string,
+    subdomain: string,
+    serviceid: string,
+    checkId: string,
+    options: CheckerOptions,
+): Promise<boolean> {
+    return unwrapSdkResponse(
+        await putDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameOptions({
+            path: { domain: domainId, zoneid: zoneId, subdomain, serviceid, cname: checkId } as any,
+            body: { options } as any,
+        }),
+    ) as boolean;
+}
+
+export async function listServiceCheckResults(
+    domainId: string,
+    zoneId: string,
+    subdomain: string,
+    serviceid: string,
+    checkName: string,
+): Promise<CheckResult[]> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameResults({
+            path: {
+                domain: domainId,
+                zoneid: zoneId,
+                subdomain,
+                serviceid,
+                cname: checkName,
+            } as any,
+        }),
+    ) as unknown as CheckResult[];
+}
+
+export async function getServiceCheckResult(
+    domainId: string,
+    zoneId: string,
+    subdomain: string,
+    serviceid: string,
+    checkName: string,
+    resultId: string,
+): Promise<CheckResult> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameResultsByResultId(
+            {
+                path: {
+                    domain: domainId,
+                    zoneid: zoneId,
+                    subdomain,
+                    serviceid,
+                    cname: checkName,
+                    result_id: resultId,
+                } as any,
+            },
+        ),
+    ) as unknown as CheckResult;
+}
+
+export async function deleteServiceCheckResult(
+    domainId: string,
+    zoneId: string,
+    subdomain: string,
+    serviceid: string,
+    checkName: string,
+    resultId: string,
+): Promise<void> {
+    await deleteDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameResultsByResultId(
+        {
+            path: {
+                domain: domainId,
+                zoneid: zoneId,
+                subdomain,
+                serviceid,
+                cname: checkName,
+                result_id: resultId,
+            } as any,
+        },
+    );
+}
+
+export async function deleteAllServiceCheckResults(
+    domainId: string,
+    zoneId: string,
+    subdomain: string,
+    serviceid: string,
+    checkName: string,
+): Promise<void> {
+    await deleteDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameResults({
+        path: { domain: domainId, zoneid: zoneId, subdomain, serviceid, cname: checkName } as any,
+    });
+}
+
+export async function getServiceCheckResultHTMLReport(
+    domainId: string,
+    zoneId: string,
+    subdomain: string,
+    serviceid: string,
+    checkName: string,
+    resultId: string,
+): Promise<string> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameResultsByResultIdReport(
+            {
+                path: {
+                    domain: domainId,
+                    zoneid: zoneId,
+                    subdomain,
+                    serviceid,
+                    cname: checkName,
+                    result_id: resultId,
+                } as any,
+            },
+        ),
+    ) as string;
+}
+
+// --- Metrics API functions ---
+
+export async function getCheckMetrics(
+    domainId: string,
+    checkName: string,
+    limit: number = 100,
+): Promise<MetricsReport> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainChecksByCnameMetrics({
+            path: { domain: domainId, cname: checkName },
+            query: { limit },
+        }),
+    ) as unknown as MetricsReport;
+}
+
+export async function getServiceCheckMetrics(
+    domainId: string,
+    zoneId: string,
+    subdomain: string,
+    serviceid: string,
+    checkName: string,
+    limit: number = 100,
+): Promise<MetricsReport> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameMetrics({
+            path: {
+                domain: domainId,
+                zoneid: zoneId,
+                subdomain,
+                serviceid,
+                cname: checkName,
+            } as any,
+            query: { limit },
+        }),
+    ) as unknown as MetricsReport;
+}
+
+export async function getCheckResultMetrics(
+    domainId: string,
+    checkName: string,
+    resultId: string,
+): Promise<MetricsReport> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainChecksByCnameResultsByResultIdMetrics({
+            path: { domain: domainId, cname: checkName, result_id: resultId },
+        }),
+    ) as unknown as MetricsReport;
+}
+
+export async function getServiceCheckResultMetrics(
+    domainId: string,
+    zoneId: string,
+    subdomain: string,
+    serviceid: string,
+    checkName: string,
+    resultId: string,
+): Promise<MetricsReport> {
+    return unwrapSdkResponse(
+        await getDomainsByDomainZoneByZoneidBySubdomainServicesByServiceidChecksByCnameResultsByResultIdMetrics(
+            {
+                path: {
+                    domain: domainId,
+                    zoneid: zoneId,
+                    subdomain,
+                    serviceid,
+                    cname: checkName,
+                    result_id: resultId,
+                } as any,
+            },
+        ),
+    ) as unknown as MetricsReport;
+}

web/src/lib/api/domaininfo.ts

@@ -0,0 +1,30 @@
+// This file is part of the happyDomain (R) project.
+// Copyright (c) 2022-2026 happyDomain
+// Authors: Pierre-Olivier Mercier, et al.
+//
+// This program is offered under a commercial and under the AGPL license.
+// For commercial licensing, contact us at <contact@happydomain.org>.
+//
+// For AGPL licensing:
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+import { postDomaininfoByDomain } from "$lib/api-base/sdk.gen";
+import type { DomainInfo } from "$lib/model/domaininfo";
+import { unwrapSdkResponse } from "./errors";
+
+export async function getDomainInfo(domain: string): Promise<DomainInfo> {
+    return unwrapSdkResponse(
+        await postDomaininfoByDomain({ path: { domain } }),
+    ) as DomainInfo;
+}

web/src/lib/components/DomainInfoDisplay.svelte

@@ -0,0 +1,227 @@
+<!--
+     This file is part of the happyDomain (R) project.
+     Copyright (c) 2022-2026 happyDomain
+     Authors: Pierre-Olivier Mercier, et al.
+
+     This program is offered under a commercial and under the AGPL license.
+     For commercial licensing, contact us at <contact@happydomain.org>.
+
+     For AGPL licensing:
+     This program is free software: you can redistribute it and/or modify
+     it under the terms of the GNU Affero General Public License as published by
+     the Free Software Foundation, either version 3 of the License, or
+     (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<script lang="ts">
+    import {
+        Badge,
+        Card,
+        CardBody,
+        CardHeader,
+        CardTitle,
+        Col,
+        ListGroup,
+        ListGroupItem,
+        Row,
+    } from "@sveltestrap/sveltestrap";
+
+    import type { DomainInfo } from "$lib/model/domaininfo";
+    import { t } from "$lib/translations";
+
+    interface Props {
+        info: DomainInfo;
+        domain: string;
+    }
+
+    let { info, domain }: Props = $props();
+
+    function statusColor(code: string): string {
+        const lc = code.toLowerCase();
+        if (lc === "ok" || lc === "active") return "success";
+        if (lc.includes("hold")) return "danger";
+        if (lc.includes("prohibited") || lc.includes("pending")) return "info";
+        return "secondary";
+    }
+
+    function expirationProgress(expiration?: string): number {
+        if (!expiration) return 0;
+        const days = daysUntilExpiration(expiration);
+        if (days <= 0) return 0;
+        return Math.min(100, Math.round((days / 365) * 100));
+    }
+
+    function expirationColor(expiration?: string): string {
+        if (!expiration) return "secondary";
+        const days = Math.round((new Date(expiration).getTime() - Date.now()) / 86400000);
+        if (days < 0) return "danger";
+        if (days < 30) return "danger";
+        if (days < 90) return "warning";
+        return "success";
+    }
+
+    function daysUntilExpiration(expiration?: string): number {
+        if (!expiration) return 0;
+        return Math.round((new Date(expiration).getTime() - Date.now()) / 86400000);
+    }
+
+    function formatDate(iso?: string): string {
+        if (!iso) return "";
+        return new Date(iso).toLocaleDateString(undefined, {
+            year: "numeric",
+            month: "long",
+            day: "numeric",
+        });
+    }
+</script>
+
+<h2 class="display-7 fw-bold mt-3 mb-1 font-monospace">
+    {info.name ?? domain}
+</h2>
+
+<!-- Status badges -->
+{#if info.status && info.status.length > 0}
+    <div class="mb-4">
+        <p class="text-muted small mb-1">{$t("domaininfo.status")}</p>
+        <div class="d-flex flex-wrap gap-2">
+            {#each info.status as code}
+                <Badge
+                    color={statusColor(code)}
+                    title={$t(`domaininfo.status-descriptions.${code}`) || code}
+                >
+                    {code}
+                </Badge>
+            {/each}
+        </div>
+        {#if info.status.length === 1}
+            {@const desc = $t(
+                `domaininfo.status-descriptions.${info.status[0]}`,
+            )}
+            {#if desc && !desc.startsWith("domaininfo.")}
+                <p class="text-muted small mt-1 mb-0">{desc}</p>
+            {/if}
+        {/if}
+    </div>
+{/if}
+
+<!-- Dates card -->
+<div class="card mb-4">
+    <div class="card-body">
+        <Row>
+            <Col sm="6" class="mb-3 mb-sm-0">
+                <p class="text-muted small mb-1">
+                    <i class="bi bi-calendar-check me-1"></i>
+                    {$t("domaininfo.creation-date")}
+                </p>
+                {#if info.creation}
+                    <p class="fw-semibold mb-0">{formatDate(info.creation)}</p>
+                {:else}
+                    <p class="text-muted mb-0">
+                        {$t("domaininfo.no-creation")}
+                    </p>
+                {/if}
+            </Col>
+            <Col sm="6">
+                <p class="text-muted small mb-1">
+                    <i class="bi bi-calendar-x me-1"></i>
+                    {$t("domaininfo.expiration-date")}
+                </p>
+                {#if info.expiration}
+                    {@const days = daysUntilExpiration(info.expiration)}
+                    {@const color = expirationColor(info.expiration)}
+                    {@const expiresLabel = days < 0 ? $t("domaininfo.expired", { days: Math.abs(days) }) : days === 0 ? $t("domaininfo.expires-today") : $t("domaininfo.expires-in", { days })}
+                    <p class="fw-semibold mb-1">
+                        {formatDate(info.expiration)}
+                    </p>
+                    <div
+                        class="progress mb-1"
+                        style="height: 6px;"
+                        title={expiresLabel}
+                    >
+                        <div
+                            class="progress-bar bg-{color}"
+                            role="progressbar"
+                            style="width: {expirationProgress(info.expiration)}%"
+                        ></div>
+                    </div>
+                    <p class="text-{color} small mb-0">
+                        {#if days < 0}
+                            {$t("domaininfo.expired", { days: Math.abs(days) })}
+                        {:else if days === 0}
+                            {$t("domaininfo.expires-today")}
+                        {:else}
+                            {$t("domaininfo.expires-in", { days })}
+                        {/if}
+                    </p>
+                {:else}
+                    <p class="text-muted mb-0">
+                        {$t("domaininfo.no-expiration")}
+                    </p>
+                {/if}
+            </Col>
+        </Row>
+    </div>
+</div>
+
+<Row>
+    <Col md={6}>
+        <!-- Registrar card -->
+        <Card class="mb-4">
+            <CardHeader>
+                <CardTitle class="h6 mb-0 fw-bold">
+                    <i class="bi bi-building me-1"></i>
+                    {$t("domaininfo.registrar")}
+                </CardTitle>
+            </CardHeader>
+            <CardBody>
+                {#if info.registrar}
+                    <p class="fw-semibold mb-1">{info.registrar}</p>
+                    {#if info.registrar_url}
+                        <a
+                            href={info.registrar_url}
+                            target="_blank"
+                            rel="noopener noreferrer"
+                            class="btn btn-outline-secondary btn-sm"
+                        >
+                            <i class="bi bi-box-arrow-up-right me-1"></i>
+                            {$t("domaininfo.registrar-url")}
+                        </a>
+                    {/if}
+                {:else}
+                    <p class="text-muted mb-0">
+                        {$t("domaininfo.no-registrar")}
+                    </p>
+                {/if}
+            </CardBody>
+        </Card>
+    </Col>
+
+    <!-- Nameservers card -->
+    {#if info.nameservers && info.nameservers.length > 0}
+        <Col md={6}>
+            <Card class="mb-4">
+                <CardHeader>
+                    <CardTitle class="h6 mb-0 fw-bold">
+                        <i class="bi bi-hdd-network me-1"></i>
+                        {$t("domaininfo.nameservers")}
+                    </CardTitle>
+                </CardHeader>
+                <ListGroup flush>
+                    {#each info.nameservers as ns}
+                        <ListGroupItem class="font-monospace py-2"
+                            >{ns}</ListGroupItem
+                        >
+                    {/each}
+                </ListGroup>
+            </Card>
+        </Col>
+    {/if}
+</Row>

web/src/lib/components/Header.svelte

@@ -137,6 +137,20 @@
                     >
                         {$t("menu.dns-resolver")}
                     </DropdownItem>
+                    <DropdownItem
+                        active={page.route && page.route.id == "/whois/[[domain]]"}
+                        href="/whois"
+                    >
+                        {$t("menu.whois")}
+                    </DropdownItem>
+                    <DropdownItem
+                        active={page.route &&
+                            (page.route.id == "/checkers" ||
+                                page.route.id?.startsWith("/checkers/"))}
+                        href="/checkers"
+                    >
+                        {$t("menu.checkers")}
+                    </DropdownItem>
                     <DropdownItem divider />
                     <DropdownItem active={page.route && page.route.id == "/me"} href="/me">
                         {$t("menu.my-account")}

web/src/lib/components/checkers/CheckMetricsChart.svelte

@@ -0,0 +1,158 @@
+<!--
+     This file is part of the happyDomain (R) project.
+     Copyright (c) 2022-2026 happyDomain
+     Authors: Pierre-Olivier Mercier, et al.
+
+     This program is offered under a commercial and under the AGPL license.
+     For commercial licensing, contact us at <contact@happydomain.org>.
+
+     For AGPL licensing:
+     This program is free software: you can redistribute it and/or modify
+     it under the terms of the GNU Affero General Public License as published by
+     the Free Software Foundation, either version 3 of the License, or
+     (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<script lang="ts">
+    import { onMount, onDestroy } from "svelte";
+    import {
+        Chart,
+        LineController,
+        LineElement,
+        PointElement,
+        LinearScale,
+        TimeScale,
+        Legend,
+        Tooltip,
+        Filler,
+    } from "chart.js";
+    import "chartjs-adapter-date-fns";
+    import type { MetricsReport } from "$lib/model/checker";
+
+    Chart.register(
+        LineController,
+        LineElement,
+        PointElement,
+        LinearScale,
+        TimeScale,
+        Legend,
+        Tooltip,
+        Filler,
+    );
+
+    interface Props {
+        report: MetricsReport;
+    }
+
+    let { report }: Props = $props();
+
+    let canvas: HTMLCanvasElement;
+    let chart: Chart | null = null;
+
+    const COLORS = [
+        "#0d6efd",
+        "#dc3545",
+        "#198754",
+        "#ffc107",
+        "#6610f2",
+        "#0dcaf0",
+        "#fd7e14",
+        "#d63384",
+    ];
+
+    function buildChart() {
+        if (chart) {
+            chart.destroy();
+            chart = null;
+        }
+        if (!canvas || !report?.series?.length) return;
+
+        const units = [...new Set(report.series.map((s) => s.unit))];
+        const hasRightAxis = units.length > 1;
+        const rightUnit = hasRightAxis ? units[1] : null;
+
+        const datasets = report.series.map((series, i) => ({
+            label: series.label,
+            data: series.points.map((p) => ({
+                x: new Date(p.timestamp).getTime(),
+                y: p.value,
+            })),
+            borderColor: COLORS[i % COLORS.length],
+            backgroundColor: COLORS[i % COLORS.length] + "20",
+            borderWidth: 2,
+            pointRadius: 3,
+            pointHoverRadius: 5,
+            tension: 0.3,
+            yAxisID: hasRightAxis && series.unit === rightUnit ? "y1" : "y",
+        }));
+
+        const scales: Record<string, any> = {
+            x: {
+                type: "time" as const,
+                time: { tooltipFormat: "PPpp" },
+                title: { display: false },
+            },
+            y: {
+                type: "linear" as const,
+                position: "left" as const,
+                title: { display: true, text: units[0] || "" },
+                beginAtZero: true,
+            },
+        };
+
+        if (hasRightAxis && rightUnit) {
+            scales.y1 = {
+                type: "linear" as const,
+                position: "right" as const,
+                title: { display: true, text: rightUnit },
+                beginAtZero: true,
+                grid: { drawOnChartArea: false },
+            };
+        }
+
+        chart = new Chart(canvas, {
+            type: "line",
+            data: { datasets },
+            options: {
+                responsive: true,
+                maintainAspectRatio: false,
+                interaction: { mode: "index", intersect: false },
+                scales,
+                plugins: {
+                    legend: { position: "bottom" },
+                    tooltip: { mode: "index", intersect: false },
+                },
+            },
+        });
+    }
+
+    onMount(() => {
+        buildChart();
+    });
+
+    $effect(() => {
+        // Re-build chart when report changes
+        if (report && canvas) {
+            buildChart();
+        }
+    });
+
+    onDestroy(() => {
+        if (chart) {
+            chart.destroy();
+            chart = null;
+        }
+    });
+</script>
+
+<div class="chart-container" style="position: relative; height: 350px; width: 100%;">
+    <canvas bind:this={canvas}></canvas>
+</div>

web/src/lib/components/checkers/CheckResultSidebar.svelte

@@ -0,0 +1,346 @@
+<!--
+     This file is part of the happyDomain (R) project.
+     Copyright (c) 2022-2026 happyDomain
+     Authors: Pierre-Olivier Mercier, et al.
+
+     This program is offered under a commercial and under the AGPL license.
+     For commercial licensing, contact us at <contact@happydomain.org>.
+
+     For AGPL licensing:
+     This program is free software: you can redistribute it and/or modify
+     it under the terms of the GNU Affero General Public License as published by
+     the Free Software Foundation, either version 3 of the License, or
+     (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<script lang="ts">
+    // SvelteKit imports
+    import { navigate } from "$lib/stores/config";
+
+    // Component imports
+    import {
+        Badge,
+        Button,
+        ButtonGroup,
+        Card,
+        CardHeader,
+        CardTitle,
+        Icon,
+        Spinner,
+        Table,
+    } from "@sveltestrap/sveltestrap";
+
+    // Store imports
+    import { currentCheckResult, currentCheckInfo, showHTMLReport, reportViewMode } from "$lib/stores/checkers";
+    import { toasts } from "$lib/stores/toasts";
+
+    // API imports
+    import {
+        deleteCheckResult,
+        deleteServiceCheckResult,
+        getCheckResultHTMLReport,
+        getServiceCheckResultHTMLReport,
+        triggerCheck,
+        triggerServiceCheck,
+    } from "$lib/api/checkers";
+
+    // Utility imports
+    import { getStatusColor, getStatusKey, formatDuration, formatCheckDate } from "$lib/utils";
+    import { t } from "$lib/translations";
+
+    // Model imports
+    import type { Domain } from "$lib/model/domain";
+
+    // Props
+    interface Props {
+        domain: Domain;
+        cname: string;
+        rid: string;
+        checksBase: string;
+        serviceContext?: {
+            zoneId: string;
+            subdomain: string;
+            serviceid: string;
+        };
+    }
+
+    let { domain, cname, rid, checksBase, serviceContext }: Props = $props();
+
+    // Local state
+    let isRelaunching = $state(false);
+
+    // Functions
+    async function handleRelaunch() {
+        if (!$currentCheckResult) return;
+        isRelaunching = true;
+        try {
+            if (serviceContext) {
+                await triggerServiceCheck(
+                    domain.id,
+                    serviceContext.zoneId,
+                    serviceContext.subdomain,
+                    serviceContext.serviceid,
+                    cname,
+                    $currentCheckResult.options,
+                );
+            } else {
+                await triggerCheck(domain.id, cname, $currentCheckResult.options);
+            }
+            navigate(`${checksBase}/${encodeURIComponent(cname)}/results`);
+        } catch (error: any) {
+            toasts.addErrorToast({
+                message: error.message || $t("checkers.result.relaunch-failed"),
+            });
+        } finally {
+            isRelaunching = false;
+        }
+    }
+
+    async function handleDelete() {
+        if (!confirm($t("checkers.result.delete-confirm"))) return;
+        try {
+            if (serviceContext) {
+                await deleteServiceCheckResult(
+                    domain.id,
+                    serviceContext.zoneId,
+                    serviceContext.subdomain,
+                    serviceContext.serviceid,
+                    cname,
+                    rid,
+                );
+            } else {
+                await deleteCheckResult(domain.id, cname, rid);
+            }
+            navigate(`${checksBase}/${encodeURIComponent(cname)}`);
+        } catch (error: any) {
+            toasts.addErrorToast({ message: error.message || $t("checkers.result.delete-failed") });
+        }
+    }
+
+    function downloadBlob(content: string, filename: string, mime: string) {
+        const blob = new Blob([content], { type: mime });
+        const url = URL.createObjectURL(blob);
+        const a = document.createElement("a");
+        a.href = url;
+        a.download = filename;
+        a.click();
+        URL.revokeObjectURL(url);
+    }
+
+    async function downloadHTML() {
+        let html: string;
+        if (serviceContext) {
+            html = await getServiceCheckResultHTMLReport(
+                domain.id,
+                serviceContext.zoneId,
+                serviceContext.subdomain,
+                serviceContext.serviceid,
+                cname,
+                rid,
+            );
+        } else {
+            html = await getCheckResultHTMLReport(domain.id, cname, rid);
+        }
+        downloadBlob(html, `${cname}-${rid}.html`, "text/html");
+    }
+
+    function downloadJSON() {
+        if (!$currentCheckResult) return;
+        downloadBlob(
+            JSON.stringify($currentCheckResult.report, null, 2),
+            `${cname}-${rid}.json`,
+            "application/json",
+        );
+    }
+</script>
+
+{#if $currentCheckResult}
+    <Card class="mt-3">
+        <CardHeader class="px-2">
+            <div class="d-flex justify-content-between align-items-center">
+                <strong class="text-truncate">{$currentCheckInfo?.name || cname}</strong>
+                {#if $currentCheckResult.scheduled_check}
+                    <Badge color="info" class="flex-shrink-0">
+                        <Icon name="clock"></Icon>
+                        {$t("checkers.result.type.scheduled")}
+                    </Badge>
+                {:else}
+                    <Badge color="secondary" class="flex-shrink-0">
+                        <Icon name="hand-index"></Icon>
+                        {$t("checkers.result.type.manual")}
+                    </Badge>
+                {/if}
+            </div>
+        </CardHeader>
+        <div class="overflow-x-auto rounded-2">
+            <Table borderless size="sm" class="mb-0">
+                <tbody>
+                    <tr>
+                        <th style="width: 80px; white-space: nowrap">
+                            {$t("checkers.result.field.executed-at")}
+                        </th>
+                        <td>{formatCheckDate($currentCheckResult.executed_at, "short", $t)}</td>
+                    </tr>
+                    <tr>
+                        <th>{$t("checkers.result.field.duration")}</th>
+                        <td>{formatDuration($currentCheckResult.duration, $t)}</td>
+                    </tr>
+                    <tr>
+                        <th>{$t("checkers.result.field.status")}</th>
+                        <td>
+                            <Badge color={getStatusColor($currentCheckResult.status)}>
+                                {$t(getStatusKey($currentCheckResult.status))}
+                            </Badge>
+                        </td>
+                    </tr>
+                    <tr>
+                        <th>{$t("checkers.result.field.status-message")}</th>
+                        <td class="text-truncate" style="max-width: 0">
+                            {$currentCheckResult.status_line}
+                        </td>
+                    </tr>
+                    {#if $currentCheckResult.error}
+                        <tr>
+                            <th>{$t("checkers.result.field.error")}</th>
+                            <td class="text-danger text-truncate" style="max-width: 0">
+                                {$currentCheckResult.error}
+                            </td>
+                        </tr>
+                    {/if}
+                </tbody>
+            </Table>
+        </div>
+    </Card>
+    {#if $currentCheckInfo?.options && $currentCheckResult.options && Object.keys($currentCheckResult.options).length > 0}
+        <Card class="mt-3">
+            <CardHeader>
+                <CardTitle class="h6 mb-0">
+                    <Icon name="sliders"></Icon>
+                    {$t("checkers.result.check-options")}
+                </CardTitle>
+            </CardHeader>
+            <div class="overflow-x-auto rounded-2">
+                <Table borderless size="sm" class="mb-0">
+                    <tbody>
+                        {#each Object.entries($currentCheckInfo.options) as [optKey, optVals]}
+                            {#each optVals as option}
+                                {@const value =
+                                    (option.id
+                                        ? $currentCheckResult.options[option.id]
+                                        : undefined) ||
+                                    option.default ||
+                                    option.placeholder ||
+                                    ""}
+                                <tr>
+                                    <th
+                                        class="text-truncate"
+                                        style="max-width: 90px"
+                                        title={option.label}
+                                    >
+                                        {option.label}:
+                                    </th>
+                                    <td class:text-truncate={typeof value !== "object"}>
+                                        {#if typeof value === "object"}
+                                            <pre class="mb-0" style="font-size: 0.75em"><code
+                                                    >{JSON.stringify(value, null, 2)}</code
+                                                ></pre>
+                                        {:else}
+                                            {value}
+                                        {/if}
+                                    </td>
+                                </tr>
+                            {/each}
+                        {/each}
+                    </tbody>
+                </Table>
+            </div>
+        </Card>
+    {/if}
+
+    <div class="my-3 flex-fill"></div>
+
+    {#if $currentCheckInfo?.has_html_report || $currentCheckInfo?.has_metrics || $currentCheckResult.report != null}
+        {#if $currentCheckInfo?.has_metrics || $currentCheckInfo?.has_html_report}
+            <ButtonGroup class="w-100 mb-2">
+                {#if $currentCheckInfo?.has_metrics}
+                    <Button
+                        size="sm"
+                        color="secondary"
+                        outline
+                        active={$reportViewMode === "metrics"}
+                        onclick={() => { reportViewMode.set("metrics"); showHTMLReport.set(false); }}
+                    >
+                        <Icon name="graph-up"></Icon>
+                        {$t("checkers.result.view-metrics")}
+                    </Button>
+                {/if}
+                {#if $currentCheckInfo?.has_html_report}
+                    <Button
+                        size="sm"
+                        color="secondary"
+                        outline
+                        active={$reportViewMode === "html" || (!$currentCheckInfo?.has_metrics && $showHTMLReport)}
+                        onclick={() => { reportViewMode.set("html"); showHTMLReport.set(true); }}
+                    >
+                        <Icon name="file-earmark-richtext"></Icon>
+                        {$t("checkers.result.view-html")}
+                    </Button>
+                {/if}
+                <Button
+                    size="sm"
+                    color="secondary"
+                    outline
+                    active={$reportViewMode === "json" || (!$currentCheckInfo?.has_metrics && !$currentCheckInfo?.has_html_report)}
+                    onclick={() => { reportViewMode.set("json"); showHTMLReport.set(false); }}
+                >
+                    <Icon name="braces"></Icon>
+                    {$t("checkers.result.view-json")}
+                </Button>
+            </ButtonGroup>
+        {/if}
+        <ButtonGroup class="w-100">
+            {#if $currentCheckInfo?.has_html_report}
+                <Button size="sm" color="outline-secondary" onclick={downloadHTML}>
+                    <Icon name="download"></Icon>
+                    {$t("checkers.result.download-html")}
+                </Button>
+            {/if}
+            {#if $currentCheckResult.report != null}
+                <Button size="sm" color="outline-secondary" onclick={downloadJSON}>
+                    <Icon name="download"></Icon>
+                    {$t("checkers.result.download-json")}
+                </Button>
+            {/if}
+        </ButtonGroup>
+    {/if}
+{:else}
+    <div class="flex-fill"></div>
+{/if}
+
+<div class="mt-2 d-flex gap-2">
+    <Button
+        class="flex-fill"
+        color="primary"
+        outline
+        onclick={handleRelaunch}
+        disabled={!$currentCheckResult || isRelaunching}
+    >
+        {#if isRelaunching}
+            <Spinner size="sm" />
+        {:else}
+            <Icon name="arrow-repeat"></Icon>
+        {/if}
+        {$t("checkers.result.relaunch")}
+    </Button>
+    <Button color="danger" outline onclick={handleDelete} disabled={!$currentCheckResult}>
+        <Icon name="trash"></Icon>
+    </Button>
+</div>

web/src/lib/components/checkers/CheckResultView.svelte

@@ -0,0 +1,137 @@
+<!--
+     This file is part of the happyDomain (R) project.
+     Copyright (c) 2022-2026 happyDomain
+     Authors: Pierre-Olivier Mercier, et al.
+
+     This program is offered under a commercial and under the AGPL license.
+     For commercial licensing, contact us at <contact@happydomain.org>.
+
+     For AGPL licensing:
+     This program is free software: you can redistribute it and/or modify
+     it under the terms of the GNU Affero General Public License as published by
+     the Free Software Foundation, either version 3 of the License, or
+     (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<script lang="ts">
+    import { Alert, Spinner, Table } from "@sveltestrap/sveltestrap";
+
+    import { onDestroy } from "svelte";
+    import { t } from "$lib/translations";
+    import type { CheckerInfo, CheckResult, MetricsReport } from "$lib/model/checker";
+    import {
+        currentCheckResult,
+        currentCheckInfo,
+        showHTMLReport,
+        reportViewMode,
+    } from "$lib/stores/checkers";
+
+    interface Props {
+        resultPromise: Promise<CheckResult>;
+        checkPromise: Promise<CheckerInfo>;
+        htmlReportPromise: Promise<string>;
+        getMetrics: () => Promise<MetricsReport>;
+    }
+
+    let { resultPromise, checkPromise, htmlReportPromise, getMetrics }: Props = $props();
+
+    let metricsReport = $state<MetricsReport | null>(null);
+
+    $effect(() => {
+        resultPromise.then((r) => currentCheckResult.set(r));
+    });
+
+    $effect(() => {
+        metricsReport = null;
+        checkPromise.then((c) => {
+            currentCheckInfo.set(c);
+            if (c.has_metrics) {
+                reportViewMode.set("metrics");
+                getMetrics()
+                    .then((r) => (metricsReport = r))
+                    .catch(() => {});
+            }
+        });
+    });
+
+    onDestroy(() => {
+        currentCheckResult.set(null);
+        currentCheckInfo.set(null);
+        showHTMLReport.set(true);
+        reportViewMode.set("html");
+    });
+</script>
+
+<div class="flex-fill mw-100 d-flex flex-column">
+    {#await Promise.all([resultPromise, checkPromise])}
+        <div class="mt-5 text-center flex-fill">
+            <Spinner />
+            <p>{$t("checkers.result.loading")}</p>
+        </div>
+    {:then [result, check]}
+        {#if result.report || check.has_html_report || check.has_metrics}
+            {#if check.has_metrics && $reportViewMode === "metrics"}
+                <div class="p-3 flex-fill">
+                    {#if metricsReport}
+                        <Table size="sm" hover striped>
+                            <thead>
+                                <tr>
+                                    <th>Metric</th>
+                                    <th class="text-end">Value</th>
+                                    <th>Unit</th>
+                                </tr>
+                            </thead>
+                            <tbody>
+                                {#each metricsReport.series as series}
+                                    {#each series.points as point}
+                                        <tr>
+                                            <td>{series.label}</td>
+                                            <td class="text-end font-monospace">{point.value}</td>
+                                            <td class="text-muted">{series.unit}</td>
+                                        </tr>
+                                    {/each}
+                                {/each}
+                            </tbody>
+                        </Table>
+                    {:else}
+                        <div class="text-center p-4"><Spinner /></div>
+                    {/if}
+                </div>
+            {:else if check.has_html_report && ($reportViewMode === "html" || ($showHTMLReport && $reportViewMode !== "json"))}
+                {#await htmlReportPromise}
+                    <div class="text-center p-4"><Spinner /></div>
+                {:then html}
+                    <iframe
+                        srcdoc={html}
+                        sandbox=""
+                        title={$t("checkers.result.full-report")}
+                        class="flex-fill"
+                        style="width: 100%; border: none; display: block;"
+                    ></iframe>
+                {:catch}
+                    <pre class="bg-light p-3 rounded mb-0"><code
+                            >{JSON.stringify(result.report, null, 2)}</code
+                        ></pre>
+                {/await}
+            {:else if typeof result.report === "string"}
+                <pre class="bg-light p-3 rounded mb-0"><code>{result.report}</code></pre>
+            {:else}
+                <pre class="bg-light p-3 rounded mb-0"><code
+                        >{JSON.stringify(result.report, null, 2)}</code
+                    ></pre>
+            {/if}
+        {/if}
+    {:catch error}
+        <Alert color="danger" class="m-3">
+            {$t("checkers.result.error-loading", { error: error.message })}
+        </Alert>
+    {/await}
+</div>

web/src/lib/components/checkers/CheckResultsPage.svelte

@@ -0,0 +1,351 @@
+<!--
+     This file is part of the happyDomain (R) project.
+     Copyright (c) 2022-2026 happyDomain
+     Authors: Pierre-Olivier Mercier, et al.
+
+     This program is offered under a commercial and under the AGPL license.
+     For commercial licensing, contact us at <contact@happydomain.org>.
+
+     For AGPL licensing:
+     This program is free software: you can redistribute it and/or modify
+     it under the terms of the GNU Affero General Public License as published by
+     the Free Software Foundation, either version 3 of the License, or
+     (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<script lang="ts">
+    import {
+        Card,
+        Alert,
+        Icon,
+        Table,
+        Badge,
+        Button,
+        Spinner,
+        ButtonGroup,
+    } from "@sveltestrap/sveltestrap";
+
+    import { onDestroy } from "svelte";
+
+    import { t } from "$lib/translations";
+    import { getCheckStatus } from "$lib/api/checkers";
+    import PageTitle from "$lib/components/PageTitle.svelte";
+    import type { Domain } from "$lib/model/domain";
+    import type { CheckExecution, CheckResult, MetricsReport } from "$lib/model/checker";
+    import { CheckExecutionStatus, CheckScopeType } from "$lib/model/checker";
+    import RunCheckModal from "$lib/components/modals/RunCheckModal.svelte";
+    import CheckMetricsChart from "$lib/components/checkers/CheckMetricsChart.svelte";
+    import { getStatusColor, getStatusKey, formatDuration, formatCheckDate } from "$lib/utils";
+
+    interface Props {
+        domain: Domain;
+        checkerName: string;
+        targetType: CheckScopeType;
+        targetId: string;
+        configurePath: string;
+        resultViewPath: (resultId: string) => string;
+        loadResults: () => Promise<CheckResult[]>;
+        getExecution: (executionId: string) => Promise<CheckExecution>;
+        deleteResult: (resultId: string) => Promise<void>;
+        deleteAllResults: () => Promise<void>;
+        loadMetrics?: () => Promise<MetricsReport>;
+        zoneId?: string;
+        subdomain?: string;
+        serviceid?: string;
+    }
+
+    let {
+        domain,
+        checkerName,
+        targetType,
+        targetId,
+        configurePath,
+        resultViewPath,
+        loadResults,
+        getExecution,
+        deleteResult,
+        deleteAllResults,
+        loadMetrics,
+        zoneId,
+        subdomain,
+        serviceid,
+    }: Props = $props();
+
+    let resultsPromise = $state(loadResults());
+    let checkerPromise = $derived(getCheckStatus(checkerName));
+    let checkerDisplayName = $state(checkerName);
+    let metricsReport = $state<MetricsReport | null>(null);
+    $effect(() => {
+        checkerPromise
+            .then((c) => {
+                checkerDisplayName = c.name || checkerName;
+                if (c.has_metrics && loadMetrics) {
+                    loadMetrics()
+                        .then((r) => (metricsReport = r))
+                        .catch(() => {});
+                }
+            })
+            .catch(() => {});
+    });
+    let runCheckModal: RunCheckModal;
+    let errorMessage = $state<string | null>(null);
+    let pendingExecutions = $state<CheckExecution[]>([]);
+    const pollingIntervals = new Map<string, ReturnType<typeof setInterval>>();
+
+    onDestroy(() => {
+        for (const id of pollingIntervals.values()) clearInterval(id);
+    });
+
+    function handleCheckTriggered(execution_id: string) {
+        const placeholder: CheckExecution = {
+            id: execution_id,
+            checker_name: checkerName,
+            owner_id: "",
+            target_type: targetType,
+            target_id: targetId,
+            status: CheckExecutionStatus.CheckExecutionPending,
+            started_at: new Date().toISOString(),
+        };
+        pendingExecutions = [...pendingExecutions, placeholder];
+
+        const intervalId = setInterval(async () => {
+            try {
+                const exec = await getExecution(execution_id);
+                pendingExecutions = pendingExecutions.map((e) =>
+                    e.id === execution_id ? exec : e,
+                );
+
+                if (
+                    exec.status === CheckExecutionStatus.CheckExecutionCompleted ||
+                    exec.status === CheckExecutionStatus.CheckExecutionFailed
+                ) {
+                    clearInterval(intervalId);
+                    pollingIntervals.delete(execution_id);
+                    pendingExecutions = pendingExecutions.filter((e) => e.id !== execution_id);
+                    resultsPromise = loadResults();
+                }
+            } catch {
+                clearInterval(intervalId);
+                pollingIntervals.delete(execution_id);
+                pendingExecutions = pendingExecutions.filter((e) => e.id !== execution_id);
+            }
+        }, 2000);
+        pollingIntervals.set(execution_id, intervalId);
+    }
+
+    async function handleDeleteResult(resultId: string) {
+        if (!confirm($t("checkers.results.delete-confirm"))) {
+            return;
+        }
+
+        try {
+            await deleteResult(resultId);
+            resultsPromise = loadResults();
+        } catch (error: any) {
+            errorMessage = error.message || $t("checkers.results.delete-failed");
+        }
+    }
+
+    async function handleDeleteAll() {
+        if (!confirm($t("checkers.results.delete-all-confirm"))) {
+            return;
+        }
+
+        try {
+            await deleteAllResults();
+            resultsPromise = loadResults();
+        } catch (error: any) {
+            errorMessage = error.message || $t("checkers.results.delete-all-failed");
+        }
+    }
+</script>
+
+<svelte:head>
+    <title>{checkerName} Results - {domain.domain} - happyDomain</title>
+</svelte:head>
+
+<div class="flex-fill pb-4 pt-2">
+    <PageTitle title={checkerDisplayName} domain={domain.domain}>
+        <div class="d-flex gap-2">
+            <Button color="dark" href={configurePath}>
+                <Icon name="gear-fill"></Icon>
+                {$t("checkers.results.configure")}
+            </Button>
+            {#await checkerPromise then checker}
+                <Button
+                    color="primary"
+                    onclick={() => runCheckModal.open(checkerName, checker.name || checkerName)}
+                >
+                    <Icon name="play-fill"></Icon>
+                    {$t("checkers.results.run-check-now")}
+                </Button>
+            {/await}
+        </div>
+    </PageTitle>
+
+    {#if errorMessage}
+        {#key errorMessage}
+            <Alert color="danger" dismissible>
+                <Icon name="exclamation-triangle-fill"></Icon>
+                {errorMessage}
+            </Alert>
+        {/key}
+    {/if}
+
+    {#await resultsPromise}
+        <div class="mt-5 text-center flex-fill">
+            <Spinner />
+            <p>{$t("checkers.results.loading")}</p>
+        </div>
+    {:then results}
+        {#if metricsReport}
+            <Card class="mb-3">
+                <div class="card-body">
+                    <CheckMetricsChart report={metricsReport} />
+                </div>
+            </Card>
+        {/if}
+        {#if (!results || results.length === 0) && pendingExecutions.length === 0}
+            <Card body>
+                <p class="text-center text-muted mb-0">
+                    <Icon name="info-circle"></Icon>
+                    {$t("checkers.results.no-results")}
+                </p>
+            </Card>
+        {:else}
+            <div class="d-flex justify-content-between align-items-center mb-2">
+                <h4>{$t("checkers.results.title", { count: results?.length ?? 0 })}</h4>
+                {#if results?.length}
+                    <Button size="sm" color="danger" outline onclick={handleDeleteAll}>
+                        <Icon name="trash"></Icon>
+                        {$t("checkers.results.delete-all")}
+                    </Button>
+                {/if}
+            </div>
+
+            <Table hover striped>
+                <thead>
+                    <tr>
+                        <th>{$t("checkers.results.table.executed-at")}</th>
+                        <th class="text-center">{$t("checkers.results.table.status")}</th>
+                        <th>{$t("checkers.results.table.message")}</th>
+                        <th>{$t("checkers.results.table.duration")}</th>
+                        <th class="text-center">{$t("checkers.results.table.type")}</th>
+                        <th>{$t("checkers.results.table.actions")}</th>
+                    </tr>
+                </thead>
+                <tbody>
+                    {#each pendingExecutions as exec (exec.id)}
+                        <tr class="table-warning">
+                            <td class="align-middle">
+                                {formatCheckDate(exec.started_at, "short", $t)}
+                            </td>
+                            <td class="align-middle text-center">
+                                <Badge
+                                    color={exec.status ===
+                                    CheckExecutionStatus.CheckExecutionRunning
+                                        ? "info"
+                                        : "secondary"}
+                                >
+                                    {exec.status === CheckExecutionStatus.CheckExecutionRunning
+                                        ? $t("checkers.results.pending.running")
+                                        : $t("checkers.results.pending.queued")}
+                                </Badge>
+                            </td>
+                            <td class="align-middle text-muted">
+                                {exec.status === CheckExecutionStatus.CheckExecutionRunning
+                                    ? $t("checkers.results.pending.running-description")
+                                    : $t("checkers.results.pending.queued-description")}
+                            </td>
+                            <td class="align-middle">—</td>
+                            <td class="align-middle text-center">
+                                <Badge color="secondary">
+                                    {#if exec.schedule_id}
+                                        <Icon name="clock"></Icon>
+                                        {$t("checkers.results.type.scheduled")}
+                                    {:else}
+                                        <Icon name="hand-index"></Icon>
+                                        {$t("checkers.results.type.manual")}
+                                    {/if}
+                                </Badge>
+                            </td>
+                            <td class="align-middle"></td>
+                        </tr>
+                    {/each}
+                    {#each results ?? [] as result}
+                        <tr>
+                            <td class="align-middle">
+                                {formatCheckDate(result.executed_at, "short", $t)}
+                            </td>
+                            <td class="align-middle text-center">
+                                <Badge color={getStatusColor(result.status)}>
+                                    {$t(getStatusKey(result.status))}
+                                </Badge>
+                            </td>
+                            <td class="align-middle">
+                                {result.status_line}
+                                {#if result.error}
+                                    <br />
+                                    <small class="text-danger">{result.error}</small>
+                                {/if}
+                            </td>
+                            <td class="align-middle">
+                                {formatDuration(result.duration, $t)}
+                            </td>
+                            <td class="align-middle text-center">
+                                <Badge color="secondary">
+                                    {#if result.scheduled_check}
+                                        <Icon name="clock"></Icon>
+                                        {$t("checkers.results.type.scheduled")}
+                                    {:else}
+                                        <Icon name="hand-index"></Icon>
+                                        {$t("checkers.results.type.manual")}
+                                    {/if}
+                                </Badge>
+                            </td>
+                            <td class="align-middle">
+                                <ButtonGroup size="sm">
+                                    <Button color="primary" href={resultViewPath(result.id!)}>
+                                        <Icon name="eye-fill"></Icon>
+                                        {$t("checkers.results.view")}
+                                    </Button>
+                                    <Button
+                                        color="danger"
+                                        outline
+                                        onclick={() => handleDeleteResult(result.id!)}
+                                    >
+                                        <Icon name="trash"></Icon>
+                                    </Button>
+                                </ButtonGroup>
+                            </td>
+                        </tr>
+                    {/each}
+                </tbody>
+            </Table>
+        {/if}
+    {:catch error}
+        <Card body color="danger">
+            <p class="mb-0">
+                <Icon name="exclamation-triangle-fill"></Icon>
+                {$t("checkers.results.error-loading", { error: error.message })}
+            </p>
+        </Card>
+    {/await}
+</div>
+
+<RunCheckModal
+    domainId={domain.id}
+    {zoneId}
+    {subdomain}
+    {serviceid}
+    onCheckTriggered={handleCheckTriggered}
+    bind:this={runCheckModal}
+/>

web/src/lib/components/checkers/CheckerOptionsCard.svelte

@@ -0,0 +1,107 @@
+<!--
+     This file is part of the happyDomain (R) project.
+     Copyright (c) 2022-2026 happyDomain
+     Authors: Pierre-Olivier Mercier, et al.
+
+     This program is offered under a commercial and under the AGPL license.
+     For commercial licensing, contact us at <contact@happydomain.org>.
+
+     For AGPL licensing:
+     This program is free software: you can redistribute it and/or modify
+     it under the terms of the GNU Affero General Public License as published by
+     the Free Software Foundation, either version 3 of the License, or
+     (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<script lang="ts">
+    import {
+        Button,
+        Card,
+        CardBody,
+        CardHeader,
+        Form,
+        FormGroup,
+        Icon,
+    } from "@sveltestrap/sveltestrap";
+
+    import Resource from "$lib/components/inputs/Resource.svelte";
+    import { t } from "$lib/translations";
+    import { toasts } from "$lib/stores/toasts";
+
+    interface Props {
+        options: Array<any>;
+        optionValues: Record<string, any>;
+        title: string;
+        saveOptionsFn: (values: Record<string, any>) => Promise<void | boolean>;
+    }
+
+    let { options, optionValues = $bindable(), title, saveOptionsFn }: Props = $props();
+
+    let saving = $state(false);
+
+    async function handleSave() {
+        saving = true;
+        try {
+            await saveOptionsFn(optionValues);
+            toasts.addToast({
+                message: $t("checkers.messages.options-updated"),
+                type: "success",
+                timeout: 5000,
+            });
+        } catch (e: any) {
+            toasts.addErrorToast({
+                message: $t("checkers.messages.update-failed", { error: e.message }),
+            });
+        } finally {
+            saving = false;
+        }
+    }
+</script>
+
+{#if options && options.length > 0}
+    <Card class="mt-3">
+        <CardHeader>
+            <strong>{title}</strong>
+        </CardHeader>
+        <CardBody>
+            <Form
+                on:submit={(e) => {
+                    e.preventDefault();
+                    handleSave();
+                }}
+            >
+                {#each options as optDoc}
+                    {#if optDoc.id}
+                        {@const optName = optDoc.id}
+                        <FormGroup>
+                            <Resource
+                                edit={true}
+                                index={optName}
+                                specs={optDoc}
+                                type={optDoc.type || "string"}
+                                bind:value={optionValues[optName]}
+                            />
+                        </FormGroup>
+                    {/if}
+                {/each}
+                <div class="d-flex gap-2">
+                    <Button type="submit" color="success" disabled={saving}>
+                        {#if saving}
+                            <span class="spinner-border spinner-border-sm me-1"></span>
+                        {/if}
+                        <Icon name="check-circle"></Icon>
+                        {$t("checkers.detail.save-changes")}
+                    </Button>
+                </div>
+            </Form>
+        </CardBody>
+    </Card>
+{/if}

web/src/lib/components/checkers/CheckerOptionsGroups.svelte

@@ -0,0 +1,107 @@
+<!--
+     This file is part of the happyDomain (R) project.
+     Copyright (c) 2022-2026 happyDomain
+     Authors: Pierre-Olivier Mercier, et al.
+
+     This program is offered under a commercial and under the AGPL license.
+     For commercial licensing, contact us at <contact@happydomain.org>.
+
+     For AGPL licensing:
+     This program is free software: you can redistribute it and/or modify
+     it under the terms of the GNU Affero General Public License as published by
+     the Free Software Foundation, either version 3 of the License, or
+     (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<script lang="ts">
+    import { Card, CardBody, CardHeader } from "@sveltestrap/sveltestrap";
+
+    import { t } from "$lib/translations";
+
+    const AUTO_FILL_KEYS: Record<string, string> = {
+        domain_name: "checkers.auto-fill.domain_name",
+        subdomain: "checkers.auto-fill.subdomain",
+        service_type: "checkers.auto-fill.service_type",
+    };
+
+    function getAutoFillLabel(autoFill: string): string {
+        const tKey = AUTO_FILL_KEYS[autoFill];
+        if (tKey) return $t(tKey);
+        return $t("checkers.auto-fill.generic", { key: autoFill });
+    }
+
+    interface OptionDef {
+        id?: string;
+        label?: string;
+        type?: string;
+        default?: unknown;
+        placeholder?: string;
+        description?: string;
+        required?: boolean;
+        autoFill?: string;
+    }
+
+    interface OptionGroup {
+        label: string;
+        opts: OptionDef[];
+    }
+
+    interface Props {
+        groups: OptionGroup[];
+    }
+
+    let { groups }: Props = $props();
+</script>
+
+{#each groups as optGroup}
+    {#if optGroup.opts.length > 0}
+        <Card class="mb-3">
+            <CardHeader>
+                <strong>{optGroup.label}</strong>
+                <small class="text-muted ms-2">{$t("checkers.detail.read-only")}</small>
+            </CardHeader>
+            <CardBody>
+                <dl class="row mb-0">
+                    {#each optGroup.opts as optDoc}
+                        {@const optName = optDoc.id!}
+                        <dt class="col-sm-4">
+                            {optDoc.label || optDoc.id}:
+                        </dt>
+                        <dd class="col-sm-8">
+                            {#if optDoc.autoFill}
+                                <span class="badge bg-info me-1">
+                                    {getAutoFillLabel(optDoc.autoFill)}
+                                </span>
+                            {:else if optDoc.default}
+                                <span class="text-muted d-block">{optDoc.default}</span>
+                            {:else if optDoc.placeholder}
+                                <em class="text-muted d-block">{optDoc.placeholder}</em>
+                            {/if}
+                            {#if optDoc.description}
+                                <small class="text-muted d-block">{optDoc.description}</small>
+                            {/if}
+                            <small class="text-muted">
+                                {$t("checkers.option-groups.type", {
+                                    type: optDoc.type || "string",
+                                })}
+                            </small>
+                            {#if optDoc.required && !optDoc.autoFill}
+                                <small class="text-danger ms-2">
+                                    {$t("checkers.option-groups.required")}
+                                </small>
+                            {/if}
+                        </dd>
+                    {/each}
+                </dl>
+            </CardBody>
+        </Card>
+    {/if}
+{/each}

web/src/lib/components/checkers/CheckerScheduleCard.svelte

@@ -0,0 +1,149 @@
+<!--
+     This file is part of the happyDomain (R) project.
+     Copyright (c) 2022-2026 happyDomain
+     Authors: Pierre-Olivier Mercier, et al.
+
+     This program is offered under a commercial and under the AGPL license.
+     For commercial licensing, contact us at <contact@happydomain.org>.
+
+     For AGPL licensing:
+     This program is free software: you can redistribute it and/or modify
+     it under the terms of the GNU Affero General Public License as published by
+     the Free Software Foundation, either version 3 of the License, or
+     (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<script lang="ts">
+    import {
+        Badge,
+        Button,
+        Card,
+        CardBody,
+        CardHeader,
+        Icon,
+        Input,
+        Spinner,
+    } from "@sveltestrap/sveltestrap";
+
+    import { t } from "$lib/translations";
+    import type { AvailableChecker } from "$lib/model/checker";
+    import { formatCheckDate, formatRelative } from "$lib/utils";
+
+    interface Props {
+        checker: AvailableChecker;
+        formEnabled: boolean;
+        formIntervalHours: number;
+        saving: boolean;
+        onSave: () => void;
+    }
+
+    let { checker, formEnabled = $bindable(), formIntervalHours = $bindable(), saving, onSave }: Props = $props();
+</script>
+
+<Card class="mb-4">
+    <CardHeader>
+        <h4 class="mb-0">
+            <Icon name="clock-history"></Icon>
+            {$t("checkers.schedule.card-title")}
+        </h4>
+    </CardHeader>
+    <CardBody>
+        <div class="mb-4">
+            <div class="form-check form-switch">
+                <input
+                    class="form-check-input"
+                    type="checkbox"
+                    role="switch"
+                    id="schedule-enabled"
+                    bind:checked={formEnabled}
+                    disabled={saving}
+                />
+                <label class="form-check-label" for="schedule-enabled">
+                    {#if formEnabled}
+                        <Badge color="success">{$t("checkers.schedule.auto-enabled")}</Badge>
+                    {:else}
+                        <Badge color="secondary">{$t("checkers.schedule.auto-disabled")}</Badge>
+                    {/if}
+                </label>
+            </div>
+        </div>
+
+        {#if formEnabled}
+            <div class="mb-4">
+                <label for="schedule-interval" class="form-label fw-semibold">
+                    {$t("checkers.schedule.interval-label")}
+                </label>
+                <div class="input-group" style="max-width: 300px;">
+                    <Input
+                        type="number"
+                        id="schedule-interval"
+                        min={1}
+                        step={1}
+                        bind:value={formIntervalHours}
+                        disabled={saving}
+                    />
+                    <span class="input-group-text">
+                        {$t("checkers.schedule.hours")}
+                    </span>
+                </div>
+                <div class="form-text">
+                    {$t("checkers.schedule.interval-hint")}
+                </div>
+            </div>
+        {/if}
+
+        {#if checker.schedule}
+            <div class="mb-4">
+                <div class="row g-3">
+                    {#if checker.schedule.last_run}
+                        <div class="col-auto">
+                            <span class="text-muted fw-semibold">
+                                {$t("checkers.schedule.last-run")}:
+                            </span>
+                            <span>
+                                {formatCheckDate(checker.schedule.last_run, "medium", $t)}
+                                <small class="text-muted">
+                                    ({formatRelative(checker.schedule.last_run, $t)})
+                                </small>
+                            </span>
+                        </div>
+                    {/if}
+                    {#if checker.enabled && checker.schedule.next_run}
+                        <div class="col-auto">
+                            <span class="text-muted fw-semibold">
+                                {$t("checkers.schedule.next-run")}:
+                            </span>
+                            <span>
+                                {formatCheckDate(checker.schedule.next_run, "medium", $t)}
+                                <small class="text-muted">
+                                    ({formatRelative(checker.schedule.next_run, $t)})
+                                </small>
+                            </span>
+                        </div>
+                    {/if}
+                </div>
+            </div>
+        {:else}
+            <p class="text-muted">
+                <Icon name="info-circle"></Icon>
+                {$t("checkers.schedule.no-schedule-yet")}
+            </p>
+        {/if}
+
+        <Button color="primary" disabled={saving} onclick={onSave}>
+            {#if saving}
+                <Spinner size="sm" class="me-1" />
+            {/if}
+            <Icon name="check-lg"></Icon>
+            {$t("checkers.schedule.save")}
+        </Button>
+    </CardBody>
+</Card>

web/src/lib/components/checkers/CheckerSidebar.svelte

@@ -0,0 +1,83 @@
+<!--
+     This file is part of the happyDomain (R) project.
+     Copyright (c) 2022-2026 happyDomain
+     Authors: Pierre-Olivier Mercier, et al.
+
+     This program is offered under a commercial and under the AGPL license.
+     For commercial licensing, contact us at <contact@happydomain.org>.
+
+     For AGPL licensing:
+     This program is free software: you can redistribute it and/or modify
+     it under the terms of the GNU Affero General Public License as published by
+     the Free Software Foundation, either version 3 of the License, or
+     (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <https://www.gnu.org/licenses/>.
+-->
+
+<script lang="ts">
+    import { Icon, Spinner } from "@sveltestrap/sveltestrap";
+
+    import { checkers } from "$lib/stores/checkers";
+    import { t } from "$lib/translations";
+
+    interface Props {
+        currentCheckId: string;
+    }
+
+    let { currentCheckId }: Props = $props();
+</script>
+
+<nav class="checker-sidebar d-flex flex-column h-100">
+    <a
+        href="/checkers"
+        class="sidebar-back d-flex align-items-center gap-1 mb-3 text-muted text-decoration-none fw-semibold"
+    >
+        <Icon name="chevron-left" />
+        {$t("checkers.title")}
+    </a>
+
+    {#if !$checkers}
+        <div class="d-flex gap-2 align-items-center justify-content-center my-3 text-muted">
+            <Spinner size="sm" color="primary" />
+        </div>
+    {:else}
+        <ul class="list-unstyled mb-0 flex-fill overflow-auto">
+            {#each Object.entries($checkers) as [checkerName, checkerInfo]}
+                {@const isActive = checkerName === currentCheckId}
+                <li>
+                    <a
+                        href="/checkers/{encodeURIComponent(checkerName)}"
+                        class="checker-item d-flex align-items-center gap-2 py-2 px-2 rounded text-decoration-none {isActive
+                            ? 'fw-bold text-primary active'
+                            : 'text-muted'}"
+                    >
+                        <span class="text-truncate">
+                            {checkerInfo.name || checkerName}
+                        </span>
+                    </a>
+                </li>
+            {/each}
+        </ul>
+    {/if}
+</nav>
+
+<style>
+    .checker-item {
+        transition: background-color 0.15s;
+    }
+
+    .checker-item:hover {
+        background-color: rgba(0, 0, 0, 0.06);
+    }
+
+    .checker-item.active {
+        background-color: rgba(var(--bs-primary-rgb), 0.1);
+    }
+</style>