Rewrite of migrations

[sonalkr132]

Our migration folder can really use some help. As of now, we have 76 migrations, and it cringe-worthy to look at them. Things were introduced, removed and introduced back again, column names and types are changed again and again and again. It would make sense to keep them if we could rollback to a previous migration, however we can't. A good number of migrations is irreversible.
It would be best if we can rewrite our migration using current state of our schema. Some relevant comment can be found here.