Database should have last_updated field

[christophfriedrich]

Right now we can't see in the database at what time someone opted out. Even the rows where the state is opted_out still have the creation timestamp in the timestamp column. I think there should be two timestamp columns, one for creation, one for last update.

Or keep a log of all opt outs? Because this year someone from the waiting list later opted out again 😂 So those time infos would be lost too even with the scheme suggested above.

[noerw]

Opting out results in a new token being created. As a result both timestamps are available technically, spread over the old and new token, you just need to follow the prev_user chain.
Though I agree, having separate timestamps is better ;)