fix bug worker

apps/notifications/announcement_worker.py

@@ -94,7 +94,8 @@ def process_due_announcements(*, job_id=None):
     ).update(status=AnnouncementJob.Status.PENDING, next_attempt_at=now)
     with transaction.atomic():
         queryset = (
-            AnnouncementJob.objects.select_for_update(skip_locked=True)
+            # Nullable message/ticket joins must not be included in FOR UPDATE on PostgreSQL.
+            AnnouncementJob.objects.select_for_update(skip_locked=True, of=("self",))
             .filter(status=AnnouncementJob.Status.PENDING, next_attempt_at__lte=now)
             .select_related("message__ticket__customer", "ticket__customer")
             .annotate(priority=Case(When(source=AnnouncementJob.Source.MANUAL, then=Value(0)), default=Value(1), output_field=IntegerField()))