I'm seeing the same thing but only when I attempt to delete a record that is somehow corrupted

In playing further and watching past Core Data videos about migration I believe the answers are (1) We can move from an optional type to a non-optional type in our SwiftData classes if we provide a default value. (1a) No migration at all seems to be required or it is a light migration that is invisible to me (2) Since I'm using CloudKit I can't change the types from Int16 to Int as I can't remove items from the CloudKit schema. It's not a big deal as I already used a computed property to convert from the Int the app uses to the Int16 the schema requires. Swift computed properties make this wrapping of types really easy to do.

Thanks - those two bullet points were exactly what I was asking. Perfect. Thank you

Joe - what are we supposed to use for playback in a Mac app? This seems like something that should be called out in an overview or intro doc.