def in_transaction(self):
    return isinstance(self._conn, datastore_rpc.TransactionalConnection)
Trigger a backfill request to `dest` for the given `room_id`
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/ndb/context.py/Context.in_transaction--crossover with--dataset/ETHPy150Open matrix-org/synapse/synapse/handlers/federation.py/FederationHandler.backfill