def get_current_backfill_token(self):

        # TODO: Fix race with the persit_event txn by using one of the
        # stream id managers
        return -self.min_stream_token
The current minimum token that backfilled events have reached
dataset/ETHPy150Open matrix-org/synapse/synapse/storage/events.py/EventsStore.get_current_backfill_token