The current scheduler holds lots of information that are no longer necessary:
- beside load-nixguix recurrent tasks all other are no longer scheduled by this old model
- only oneshot tasks are interesting but no more than 2 months old (save code now, deposit, vault, ...)
Those can be archived (and later on be dropped if we don't read in those [1]
This will make the current mechanisms that needs read/write in those tables faster.
[1] we usually don't.