[Mailman-Developers] Re: Alembic not going back to previous migration?

I will explain a little bit more what I exactly did, I downgraded alembic to 2d2d0ef0828f version, made changes to 58858f75303c migration file and then tried to upgrade again but alembic is recognising duplicating columns which means it has not downgraded properly, can we somehow erase all changes keep till 2d2d0ef0828f version somehow cleanly?
Pointers on this are required.