Delete expired pastes that are never accessed again

[FliegendeWurst]

If I understand the code correctly, the only way an expired paste gets deleted is if someone tries to access it after the expiration date.
This is seemingly confirmed by my database containing pastes that expired 12 days ago.
In my workflow, many pastes are never accessed after their expiration. So I think it would be good to implement a periodic "delete all expired pastes" job.

[matze]

It used to be the case but has been changed with 2.3.0. I put it on my list of features for the CLI tool though.