This should help you:
https://github.com/JetBrains/Exposed/wiki/DAO#auto-fill-created-and-updated-columns-on-entity-change
Thanks, but it's a bit hard to reason about, the whole thing is entwined with the IntIdTable and IntEntity. I still haven't been able to isolate just that part of the logic. A minimal example would make much better documentation.
Just my two cents 馃槃
Most helpful comment
This should help you:
https://github.com/JetBrains/Exposed/wiki/DAO#auto-fill-created-and-updated-columns-on-entity-change