You roll back a schema migration on a dev/test database by nuking it and regenerating it, probably with the same tools you use to manage the rest of your enviro

You roll back a schema migration on a dev/test database by nuking it and regenerating it, probably with the same tools you use to manage the rest of your environment. You don't rollback a schema migration to a production database, because that is impossible. What has been done cannot be undone.