diff --git a/ui/package-lock.json b/ui/package-lock.json
index 2c160ee..3ce834a 100644
--- a/ui/package-lock.json
+++ b/ui/package-lock.json
@@ -8,7 +8,6 @@
       "name": "atsebayt",
       "version": "0.0.1",
       "dependencies": {
-        "dayjs": "^1.11.5",
         "svelte-frappe-charts": "^1.9.1",
         "vite": "^3.0.4"
       },
@@ -646,11 +645,6 @@
         "node": ">= 8"
       }
     },
-    "node_modules/dayjs": {
-      "version": "1.11.5",
-      "resolved": "https://registry.npmjs.org/dayjs/-/dayjs-1.11.5.tgz",
-      "integrity": "sha512-CAdX5Q3YW3Gclyo5Vpqkgpj8fSdLQcRuzfX6mC6Phy0nfJ0eGYOeS7m4mt2plDWLAtA4TqTakvbboHvUxfe4iA=="
-    },
     "node_modules/debug": {
       "version": "4.3.4",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
@@ -3097,11 +3091,6 @@
         "which": "^2.0.1"
       }
     },
-    "dayjs": {
-      "version": "1.11.5",
-      "resolved": "https://registry.npmjs.org/dayjs/-/dayjs-1.11.5.tgz",
-      "integrity": "sha512-CAdX5Q3YW3Gclyo5Vpqkgpj8fSdLQcRuzfX6mC6Phy0nfJ0eGYOeS7m4mt2plDWLAtA4TqTakvbboHvUxfe4iA=="
-    },
     "debug": {
       "version": "4.3.4",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
diff --git a/ui/package.json b/ui/package.json
index dc0668f..76e67f4 100644
--- a/ui/package.json
+++ b/ui/package.json
@@ -28,7 +28,6 @@
   },
   "type": "module",
   "dependencies": {
-    "dayjs": "^1.11.5",
     "svelte-frappe-charts": "^1.9.1",
     "vite": "^3.0.4"
   }
diff --git a/ui/src/components/DateTimeInput.svelte b/ui/src/components/DateTimeInput.svelte
deleted file mode 100644
index d39ff70..0000000
--- a/ui/src/components/DateTimeInput.svelte
+++ /dev/null
@@ -1,21 +0,0 @@
-<script>
- import dayjs from 'dayjs';
-
- export let format = 'YYYY-MM-DD HH:mm';
- export let date = new Date();
-
- let className = '';
- export { className as class };
-
- export let id = null;
-
- let internal;
-
- const input = (x) => (internal = dayjs(x).format(format));
- const output = (x) => (date = dayjs(x, format).toDate().toISOString());
-
- $: input(date)
- $: output(internal)
-</script>
-
-<input type="datetime-local" class={className} id={id} bind:value={internal}>
diff --git a/ui/src/components/SubmissionStatus.svelte b/ui/src/components/SubmissionStatus.svelte
index b7ad14a..5a2b1d4 100644
--- a/ui/src/components/SubmissionStatus.svelte
+++ b/ui/src/components/SubmissionStatus.svelte
@@ -1,6 +1,4 @@
 <script>
- import { createEventDispatcher } from 'svelte';
-
  import DateFormat from '../components/DateFormat.svelte';
  import { getUserRendu } from '../lib/works';
 
@@ -9,32 +7,12 @@
 
  export let work = null;
  export let user = null;
-
- const dispatch = createEventDispatcher();
- let renduP = null;
- let submissionP = null;
-
- if (work.submission_url != '-') {
-     if (work.submission_url) {
-         renduP = getUserRendu(work.submission_url, user);
-         renduP.then((rendu) => {
-             if (rendu !== null) {
-                 dispatch('done');
-             }
-         })
-     } else {
-         submissionP = work.getSubmission(user.id);
-         submissionP.then((submission) => {
-             dispatch('done');
-         })
-     }
- }
 </script>
 
 {#if work.submission_url == '-'}
     <!-- Display nothing -->
 {:else if work.submission_url}
-    {#await renduP}
+    {#await getUserRendu(work.submission_url, user)}
         <div class="spinner-border spinner-border-sm" role="status"></div>
     {:then rendu}
         {#if rendu === null}
@@ -46,7 +24,7 @@
         <i class="bi text-warning bi-exclamation-triangle-fill" title={error}></i>
     {/await}
 {:else}
-    {#await submissionP}
+    {#await work.getSubmission(user.id)}
         <div class="spinner-border spinner-border-sm" role="status"></div>
     {:then submission}
         <i class="bi text-success bi-check-circle-fill" title={"Rendu effectué : " + JSON.stringify(submission)}></i>
diff --git a/ui/src/components/SurveyAdmin.svelte b/ui/src/components/SurveyAdmin.svelte
index 865e6a3..07b1455 100644
--- a/ui/src/components/SurveyAdmin.svelte
+++ b/ui/src/components/SurveyAdmin.svelte
@@ -3,7 +3,6 @@
  import { goto } from '$app/navigation';
 
  import { getQuestions } from '../lib/questions';
- import DateTimeInput from './DateTimeInput.svelte';
  import { ToastsStore } from '../stores/toasts';
 
  const dispatch = createEventDispatcher();
@@ -14,21 +13,17 @@
          dispatch('saved', response);
      }, (error) => {
          ToastsStore.addErrorToast({
-             msg: error,
+             msg: error.errmsg,
          });
      })
  }
 
- let deleteInProgress = false;
  function deleteSurvey() {
-     deleteInProgress = true;
      survey.delete().then((response) => {
-         deleteInProgress = false;
          goto(`surveys`);
      }, (error) => {
-         deleteInProgress = false;
          ToastsStore.addErrorToast({
-             msg: error,
+             msg: error.errmsg,
          });
      })
  }
@@ -38,7 +33,7 @@
          goto(`surveys/${response.id}`);
      }).catch((error) => {
          ToastsStore.addErrorToast({
-             msg: error,
+             msg: error.errmsg,
          });
      })
  }
@@ -109,7 +104,7 @@
             <label for="start_availability" class="col-form-label col-form-label-sm">Date de début</label>
         </div>
         <div class="col-sm-8">
-            <DateTimeInput class="form-control form-control-sm" id="start_availability" bind:date={survey.start_availability} />
+            <input type="text" class="form-control form-control-sm" id="start_availability" bind:value={survey.start_availability}>
         </div>
     </div>
 
@@ -118,7 +113,7 @@
             <label for="end_availability" class="col-form-label col-form-label-sm">Date de fin</label>
         </div>
         <div class="col-8">
-            <DateTimeInput class="form-control form-control-sm" id="end_availability" bind:date={survey.end_availability} />
+            <input type="text" class="form-control form-control-sm" id="end_availability" bind:value={survey.end_availability}>
         </div>
     </div>
 
@@ -142,12 +137,7 @@
         <div class="col-sm-10">
             <button type="submit" class="btn btn-primary">Enregistrer</button>
             {#if survey.id}
-                <button type="button" class="btn btn-danger" on:click={deleteSurvey} disabled={deleteInProgress}>
-                    {#if deleteInProgress}
-                        <div class="spinner-border spinner-border-sm text-light me-1" role="status"></div>
-                    {/if}
-                    Supprimer
-                </button>
+                <button type="button" class="btn btn-danger" on:click={deleteSurvey}>Supprimer</button>
                 <button type="button" class="btn btn-secondary" on:click={duplicateSurvey}>Dupliquer avec ces nouveaux paramètres</button>
             {/if}
         </div>
diff --git a/ui/src/components/WorkAdmin.svelte b/ui/src/components/WorkAdmin.svelte
index 8660e1d..b9e7c55 100644
--- a/ui/src/components/WorkAdmin.svelte
+++ b/ui/src/components/WorkAdmin.svelte
@@ -2,7 +2,6 @@
  import { createEventDispatcher } from 'svelte';
  import { goto } from '$app/navigation';
 
- import DateTimeInput from './DateTimeInput.svelte';
  import { ToastsStore } from '../stores/toasts';
 
  const dispatch = createEventDispatcher();
@@ -13,7 +12,7 @@
          dispatch('saved', response);
      }, (error) => {
          ToastsStore.addErrorToast({
-             msg: error,
+             msg: error.errmsg,
          });
      })
  }
@@ -23,7 +22,7 @@
          goto(`works`);
      }, (error) => {
          ToastsStore.addErrorToast({
-             msg: error,
+             msg: error.errmsg,
          });
      })
  }
@@ -33,7 +32,7 @@
          goto(`works/${response.id}`);
      }).catch((error) => {
          ToastsStore.addErrorToast({
-             msg: error,
+             msg: error.errmsg,
          });
      })
  }
@@ -103,7 +102,7 @@
             <label for="start_availability" class="col-form-label col-form-label-sm">Date de début</label>
         </div>
         <div class="col-sm-8">
-            <DateTimeInput class="form-control form-control-sm" id="start_availability" bind:date={work.start_availability} />
+            <input type="text" class="form-control form-control-sm" id="start_availability" bind:value={work.start_availability}>
         </div>
     </div>
 
@@ -112,7 +111,7 @@
             <label for="end_availability" class="col-form-label col-form-label-sm">Date de fin</label>
         </div>
         <div class="col-8">
-            <DateTimeInput class="form-control form-control-sm" id="end_availability" bind:date={work.end_availability} />
+            <input type="text" class="form-control form-control-sm" id="end_availability" bind:value={work.end_availability}>
         </div>
     </div>
 
diff --git a/ui/src/lib/questions.js b/ui/src/lib/questions.js
index 53e2115..bb81ab0 100644
--- a/ui/src/lib/questions.js
+++ b/ui/src/lib/questions.js
@@ -120,12 +120,6 @@ export class Question {
 
   async delete() {
     if (this.id) {
-      // Start by deleting proposals
-      const proposals = await this.getProposals();
-      for (const p of proposals) {
-        await p.delete();
-      }
-
       const res = await fetch(`api/questions/${this.id}`, {
         method: 'DELETE',
         headers: {'Accept': 'application/json'},
diff --git a/ui/src/lib/surveys.js b/ui/src/lib/surveys.js
index 9e1e69f..b3904d3 100644
--- a/ui/src/lib/surveys.js
+++ b/ui/src/lib/surveys.js
@@ -1,4 +1,3 @@
-import { getCorrectionTemplates } from './correctionTemplates';
 import { getQuestions } from './questions';
 import { Response } from './response';
 import { Work } from './works';
@@ -102,33 +101,9 @@ export class Survey {
         // Now recopy questions
         const questions = await getQuestions(oldSurveyId);
         for (const q of questions) {
-          const oldQuestionId = q.id;
-
           delete q.id;
           q.id_survey = response.id;
-          q.save().then((question) => {
-            q.id = oldQuestionId;
-
-            // Now recopy proposals
-            if (q.kind == "mcq" || q.kind == "ucq") {
-              q.getProposals().then((proposals) => {
-                for (const p of proposals) {
-                  delete p.id;
-                  p.id_question = question.id;
-                  p.save();
-                }
-              });
-            }
-
-            // Now recopy correction templates
-            getCorrectionTemplates(oldQuestionId).then((cts) => {
-              for (const ct of cts) {
-                delete ct.id;
-                ct.id_question = question.id;
-                ct.save();
-              }
-            });
-          });
+          q.save();
         }
 
         return response;
@@ -140,12 +115,6 @@ export class Survey {
 
   async delete() {
     if (this.id) {
-      // Start by deleting questions
-      const questions = await getQuestions(this.id);
-      for (const q of questions) {
-        await q.delete();
-      }
-
       const res = await fetch(`api/surveys/${this.id}`, {
         method: 'DELETE',
         headers: {'Accept': 'application/json'},
diff --git a/ui/src/routes/surveys/[sid]/responses/index.svelte b/ui/src/routes/surveys/[sid]/responses/index.svelte
index 6414f38..f90105f 100644
--- a/ui/src/routes/surveys/[sid]/responses/index.svelte
+++ b/ui/src/routes/surveys/[sid]/responses/index.svelte
@@ -13,26 +13,20 @@
 <script lang="ts">
  import { goto } from '$app/navigation';
 
- import { user } from '../../../../stores/user';
  import StartStopLiveSurvey from '../../../../components/StartStopLiveSurvey.svelte';
- import SurveyAdmin from '../../../../components/SurveyAdmin.svelte';
  import SurveyBadge from '../../../../components/SurveyBadge.svelte';
  import SurveyQuestions from '../../../../components/SurveyQuestions.svelte';
  import { getQuestions } from '../../../../lib/questions';
 
  export let surveyP;
- let edit = false;
 </script>
 
 {#await surveyP then survey}
-    {#if $user && $user.is_admin}
-        <button class="btn btn-primary ms-1 float-end" on:click={() => { edit = !edit; } } title="Éditer"><i class="bi bi-pencil"></i></button>
-        <StartStopLiveSurvey
-            {survey}
-            class="ms-1 float-end"
-            on:update={() => goto(`surveys/${survey.id}/admin`)}
-        />
-    {/if}
+    <StartStopLiveSurvey
+        {survey}
+        class="ms-1 float-end"
+        on:update={() => goto(`surveys/${survey.id}/admin`)}
+    />
     <div class="d-flex align-items-center">
         <h2>
             <a href="surveys/{survey.id}" class="text-muted" style="text-decoration: none">&lt;</a>
@@ -42,10 +36,6 @@
         <SurveyBadge class="ms-2" {survey} />
     </div>
 
-    {#if $user && $user.is_admin && edit}
-        <SurveyAdmin {survey} on:saved={() => edit = false} />
-    {/if}
-
     {#await getQuestions(survey.id)}
         <div class="text-center">
             <div class="spinner-border text-primary mx-3" role="status"></div>
diff --git a/ui/src/routes/works/[wid]/rendus.svelte b/ui/src/routes/works/[wid]/rendus.svelte
index 55ebb28..2511e44 100644
--- a/ui/src/routes/works/[wid]/rendus.svelte
+++ b/ui/src/routes/works/[wid]/rendus.svelte
@@ -22,14 +22,6 @@
  import { getUsers } from '../../../lib/users';
 
  export let work = null;
- let usersP = null;
- work.then((w) => {
-     usersP = getUsers(w.promo, w.group);
-     usersP.then((users) => { nb_users = users.length; });
- });
-
- let nb_rendus = 0;
- let nb_users = 0;
 </script>
 
 {#await work then w}
@@ -37,12 +29,12 @@
         <h2>
             <a href="works/{w.id}" class="text-muted" style="text-decoration: none">&lt;</a>
             {w.title}
-            <small class="text-muted">Rendus {Math.trunc(nb_rendus/nb_users*100)}&nbsp;% ({nb_rendus}/{nb_users})</small>
         </h2>
         <SurveyBadge class="ms-2" survey={w} />
     </div>
 
-    {#await usersP then users}
+    {#await getUsers(w.promo, w.group)}
+    {:then users}
         <table class="w-100 mb-5">
             <thead>
                 <tr>
@@ -56,7 +48,7 @@
                     <tr>
                         <td><a href="users/{user.login}">{user.login}</a></td>
                         <td>
-                            <SubmissionStatus work={w} user={user} on:done={() => { nb_rendus += 1; user.show_dl_btn = true; }} />
+                            <SubmissionStatus work={w} user={user} />
                         </td>
                         <td>
                             {#await getRepositories(w.id, user.id) then repos}
@@ -90,7 +82,6 @@
                             <a
                                 href="/api/users/{user.id}/works/{w.id}/download"
                                 class="btn btn-sm btn-dark"
-                                class:disabled={!user.show_dl_btn}
                                 title="Télécharger la tarball du rendu"
                             >
                                 <i class="bi bi-download"></i>