Add durable pending runs and recipe list debugging

- Store pending runs in PostgreSQL for durability across restarts
- Add recovery method for orphaned runs
- Increase Celery result_expires to 7 days
- Add task_reject_on_worker_lost for automatic re-queuing
- Add logging to recipe list to debug filter issues

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

celery_app.py

@@ -18,7 +18,7 @@ app = Celery(
 )
 
 app.conf.update(
-    result_expires=3600,
+    result_expires=86400 * 7,  # 7 days - allow time for recovery after restarts
     task_serializer='json',
     accept_content=['json', 'pickle'],  # pickle needed for internal Celery messages
     result_serializer='json',
@@ -26,8 +26,10 @@ app.conf.update(
     timezone='UTC',
     enable_utc=True,
     task_track_started=True,
-    task_acks_late=True,
+    task_acks_late=True,  # Don't ack until task completes - survives worker restart
     worker_prefetch_multiplier=1,
+    task_reject_on_worker_lost=True,  # Re-queue if worker dies
+    task_acks_on_failure_or_timeout=True,  # Ack failed tasks so they don't retry forever
 )
 
 if __name__ == '__main__':