Fixes (#15465)

* Fix single event return

* Allow customizing if search is preserved for overlay state

* Remove timeout

* Cleanup

* Cleanup naming

frigate/events/cleanup.py

@@ -256,8 +256,9 @@ class EventCleanup(threading.Thread):
 
         events_to_update = []
 
-        for batch in query.iterator():
-            events_to_update.extend([event.id for event in batch])
+        for event in query.iterator():
+            events_to_update.append(event)
+
             if len(events_to_update) >= CHUNK_SIZE:
                 logger.debug(
                     f"Updating {update_params} for {len(events_to_update)} events"