Core data migration: Set a unique constraint to a parameter and avoid duplicates

Coredata migrations are easier said than done, isn’t it? One wrong step and we are doomed. 😥  Coming from an Android background (where the platform allows writing raw SQLite queries in the migration), it feels tough to handle manual migration on iOS. Although I love the fact that lightweight migration works out of the box, when it comes to other types of migrations, it’s just too many tasks to remember, and it feels like I’m defusing a bomb. Context We…