old_contents: from base import BaseCSV, get_local_handles, ingest_feeds, create_seasons
  from overview import (ClubIngest, CountryIngest, CompetitionIngest, PlayerIngest, PersonIngest)
  from financial import (AcquisitionIngest, PlayerSalaryIngest, PartialTenureIngest)
  from statistics import (FieldStatIngest, GoalkeeperStatIngest, LeaguePointIngest)
  
  
new_contents: from base import BaseCSV, get_local_handles, ingest_feeds, create_seasons
  from overview import (ClubIngest, CountryIngest, CompetitionIngest, PlayerIngest, PersonIngest)
  from financial import (AcquisitionIngest, PlayerSalaryIngest, PartialTenureIngest)
  from statistics import (FieldStatIngest, GoalkeeperStatIngest, LeaguePointIngest)
  
  
  CSV_ETL_CLASSES = [
      ('Clubs', ClubIngest),
      ('Competitions', CompetitionIngest),
      ('Players', PlayerIngest),
      ('Acquisitions', AcquisitionIngest),
      ('Salaries', PlayerSalaryIngest),
      ('Partials', PartialTenureIngest),
      ('FieldStats', FieldStatIngest),
      ('GkStats', GoalkeeperStatIngest),
      ('LeaguePoints', LeaguePointIngest)
  ]
  
subject: Add list of entities and ETL classes for CSV files