def _get_min_depth_interaction(self, txn, room_id):
        min_depth = self._simple_select_one_onecol_txn(
            txn,
            table="room_depth",
            keyvalues={"room_id": room_id},
            retcol="min_depth",
            allow_none=True,
        )

        return int(min_depth) if min_depth is not None else None
dataset/ETHPy150Open matrix-org/synapse/synapse/storage/event_federation.py/EventFederationStore._get_min_depth_interaction/original