

def _get_oldest_events_in_room_txn(self, txn, room_id):
    return txn._simple_select_onecol_txn(txn, table='event_backward_extremities', keyvalues={
        'room_id': room_id,
    }, retcol='event_id')

dataset/ETHPy150Open matrix-org/synapse/synapse/storage/event_federation.py EventFederationStore._get_oldest_events_in_room_txn/VarMisuse@15/25 `self`->`txn`