def preseed_event_teams(team_keys: List[ndb.Key], event_key: EventKey) -> None:
    event_teams = [EventTeam(id=f'{event_key}_{t.id()}', event=ndb.Key(Event, event_key), team=t, year=int(event_key[:4])) for t in team_keys]
    ndb.put_multi(event_teams)
def preseed_event_teams(team_keys: List[ndb.Key], event_key: EventKey) -> None:
    event_teams = [EventTeam(id=f'{event_key}_{t.id()}', event=ndb.Key(Event, event_key), team=t, year=int(event_key[:4])) for t in team_keys]
    ndb.put_multi(event_teams)