I wrote a python handler to query the GItea api and either mirror from source repos that were a straight mirror, or full clone/standalone local repos. Also handled creating orgs (using the forgejo api), since I wasn’t going to do any of that by hand.
I didn’t trust my results trying to migrate the db, as I’d waited past the fork.
I didn’t have any to move, so I didn’t allow for that. I’d assume not though.