This is made possible by Swift macros, which also will make migration easier. I can imagine starting out with SwiftData @Model's, but then redefining the @Mode

This is made possible by Swift macros, which also will make migration easier. I can imagine starting out with SwiftData @Model's, but then redefining the @Model macro to work with another backend -- even deploying the same models to different backends on different platforms (e.g., CoreData on iOS and MySQL on Linux). "API-compatible" now includes attributes. This could be a great opportunity for alternatives to the CoreData stack.