I'm accepting this answer but not following it. I have a json export path to archive data and I developed a json import to the new SwiftData model. Using this as a way to import old data instead of a many step migration.

The backtick was my first try but the SwiftData macros do not handle the backtick.

I had the external drive working with Xcode beta 1 and I have a refurbished m2pro mini with too small of an internal drive to partition for sequoia dev. How long a wait for this to come back? I guess I will reinstall beta 1 until then.