alphagov/transition — pull request #325 by issyl0 (2014-06-18 15:18:05+00:00)
Title: Change the remove_global_http_status_column migration to be reversible

- Following me making this only a `change` migration in #319, a discussion
happened in which it was decided that it is important that it is
reversible, otherwise things break in the event of an aborted deploy
if the column removed does not rollback to exist again.