benedmunds/CodeIgniter-Ion-Auth — pull request #443 by LuCiAn0 (2013-04-10 22:31:44+00:00)
Title: Define foreign keys, db engine, and encoding

Sometimes it's necessary to manually delete users and/or groups directly in the database.
Adding 'on delete' cascade actions and foreign keys ensure that no null references are left whenever users and/or groups are deleted.