Immutable Classes: Only Classes, no database change
I split branch 547-immutable-datenfelder (!423 (closed)) into more manageable PRs.
This one contains just the immutable classes from branch 547-immutable-dataclasses.
I split branch 547-immutable-datenfelder (!423 (closed)) into more manageable PRs.
This one contains just the immutable classes from branch 547-immutable-dataclasses.