Hi , I don't know if this is a bug or not but here's the current issue : generated a simple dev.db file , added one record with field name, let's say 'Post-1' added @unique to the name field when I try to add a new record with the same name 'Post-1' , it works and doesn't give any error , which results in duplicate names adding another record 'Post-1' now gives an error.

When you added @unique after adding first record i think migration system drop this record and you started from first So when you added second one not get problems Third one get problem