The site admin can add new seasons [1], view a list of existing seasons [2], edit an existing season [3], or delete a season [4].
[1] The site admin selects a league, and adds a new season passing in a name and year.
[2] The site admin visits a page listing the seasons grouped by league and sorted by year.
[3] The site admin selects a season from a list, and changes the name and year of the season record.
[4] The site admin selects a season from a list, and deletes the record.