Allow inherited field to map to tables

[eweise]

i created a parent class with created_at and updated_at fields but unfortunately Magnum could not map them I guess because its using a Scala 3 Mirror which only maps case class constructors. It would be great to be able to put these audit type field in a single place so they don't have to be declared in every case class.

[guizmaii]

My worthless 2 cents: I'm not August but if I was, I'd not complexify Magnum codebase for such a little DRY. Repetition is harmless, especially in this AI age. It'd need a much better justification to justify complexifying Magnum's codebase and justify the work needed

The (relative) simplicity of Magnum's codebase has, in my opinion, more value

[AugustNagro]

Right, I agree with Jules here. Although it's tempting, the complexity is high for the library, and, arguably, user level. There's a lot of edge cases.

Thank you for the issue / user report though. Please keep the feedback coming if you encounter any other problems.