Store looping call

synapse/storage/event_push_actions.py

@@ -84,7 +84,9 @@ class EventPushActionsStore(SQLBaseStore):
         )
 
         self._doing_notif_rotation = False
-        self._clock.looping_call(self._rotate_notifs, 30 * 60 * 1000)
+        self._rotate_notif_loop = self._clock.looping_call(
+            self._rotate_notifs, 30 * 60 * 1000
+        )
 
     def _set_push_actions_for_event_and_users_txn(self, txn, event, tuples):
         """