Performance Degradation after 1.15 -> 1.16 Upgrade

The way we are expiring reports is terrible and very transaction-unfriendly. I started an attempt to fix this in

but I don’t have time to finish this. The idea is to break the deletion into small transactions (batches).

BUT I don’t think that this is the root cause of Ruby processes burning CPU. The reports expiration rather creates transaction errors than loops with some hard work.