It shouldn't matter if round.id is null, all jobs that haven't yet been judged are judged in the background :)
I see now we can also remove those JOINS.

We join with round so users won't be able to guess their score with score_begin and score_end for rounds that don't have public eval. I'll add a comment :)

I think I used 0 and 1 since that's how it's going to be stored in the database. Therefore round_validate needs to check if public_eval is a number so we need to use 0 or 1.

I don't really see how we could do this nicely. Adding a parameter to not judge jobs at all for a round seems a little too much.

We can just stop the eval 5 minutes before the end of a round and reeval everything on the projector or not start the eval at all. :)

Previously, when rounds finished allow_eval would be turned to 1, so all rounds that finished would have allow_eval equal to 1. Rounds that haven't yet started would also have allow_eval equal to 0 or 1 depending on what is wanted, so those values fit perfectly.