Code review comment for lp:~rvb/launchpad/db-distroseries-migrate-owner-to-registrant

patch-2208-53-0.sql has already been landed, adding a new registrant column but not dropping the old owner column.

If we don't want the owner column, we need a patch that drops the owner column. We can't back out db-patches once they land without screwing up the staging server.