My plan is to delete the old Core Data stack (the `NSManagedObjectModel` `.momd` file & the `NSPersistentStore` `.sqlite` file) because:

* I don't have experience with Core Data migrations.
* the new .xcdatamodel schema is completely different than the old one.
* I can safely delete the user's old data because it's all stored on our server and the new app downloads the latest data from our server anyway.

In this case, is complete deletion the best way to go about migration?