def preseed_teams(start_team: int, end_team: Optional[int]=None) -> List[ndb.Key]:
    end_team = (end_team or start_team)
    stored = ndb.put_multi([Team(id=f'frc{i}', team_number=i) for i in range(start_team, (end_team + 1))])
    assert (len(stored) == ((end_team - start_team) + 1))
    return stored
def preseed_teams(start_team: int, end_team: Optional[int]=None) -> List[ndb.Key]:
    end_team = (end_team or start_team)
    stored = ndb.put_multi([Team(id=f'frc{i}', team_number=i) for i in range(start_team, (end_team + 1))])
    assert (len(stored) == ((end_team - start_team) + 1))
    return stored