diff --git a/ingest/radieo/__main__.py b/ingest/radieo/__main__.py
index 7923a9c..160f4ff 100644
--- a/ingest/radieo/__main__.py
+++ b/ingest/radieo/__main__.py
@@ -1,6 +1,8 @@
 """Entry point: wire providers/fetchers into the queue and serve GET /next."""
 
 import logging
+import signal
+import threading
 
 from . import config
 from .api import IngestServer
@@ -159,6 +161,17 @@ def main() -> None:
         config.CACHE_DIR,
         config.STATE_DB,
     )
+
+    # Shut down cleanly on `docker compose down` (SIGTERM) instead of being
+    # killed after the grace period. shutdown() must run off the serving
+    # thread, so hand it to a helper thread.
+    def _handle_signal(signum, _frame):
+        log.info("received signal %d, shutting down", signum)
+        threading.Thread(target=server.shutdown, daemon=True).start()
+
+    signal.signal(signal.SIGTERM, _handle_signal)
+    signal.signal(signal.SIGINT, _handle_signal)
+
     try:
         server.serve_forever()
     except KeyboardInterrupt: