Shared column schema: espn mbb season group teams schema

Columns shared verbatim across: espn_mbb_season_group_teams, espn_nba_season_group_teams.

Details

col_name	types	description
league	character	League slug.
season	integer	Season year.
season_type	integer	Season-type id.
group_id	character	ESPN group id.
team_id	character	ESPN team id.
ref	character	$ref URL to the team-in-season entry.