Run delete stale devices background task on start

Author: Fizzadar

synapse/handlers/device.py

@@ -197,6 +197,12 @@ def __init__(self, hs: "HomeServer"):
                 server_name=self.server_name,
                 func=self._delete_stale_devices,
             )
+            # Beep: run this immediately since looping_call waits 24h after pod start
+            run_as_background_process(
+                "delete_stale_devices",
+                server_name=self.server_name,
+                func=self._delete_stale_devices,
+            )
 
     async def _delete_stale_devices(self) -> None:
         """Background task that deletes devices which haven't been accessed for more than