First I thought he exagerated, but then people were saying stuff like: "I created 80 enriched fire essences in 5 minutes". Now, that was not supposed to happen. Normally, creating an enriched fire essence is a chance in 1K. The way I designed it, with some special perk and that more rare items day, the chance should have been maybe one in 500, but not 80%!
One admin command was used to change the random day to some other day, only 16 minutes after it started, but it was already too late.
I took a quick look at the items stats log (where it shows how many items entered and exited the game) and to my surprise, about 6K enriched fire essences were created. If leaving things as they were, that would have totally and irrevokably fucked up the whole ingame economy.
So we had to do a rollback to the last backups (about 18 hours lost, 2 days lost for some other players who were online continously for more than 18 hours).
Most of the players understood the need to do that, but a few were bitching (which was not really so unexpected). Half an hour before the rollback, I told them that since we will have a rollback anyay, they might as well get their best items and go have some fun in the main PK map. Which they did, and it was interesting to watch them all wearing their best gear that is usually only for the show :)
After the rollback was completed, I manually set the current day to the "day of more experience", with a 40% experience increase, in order to somehow compensate for the damage.
Now everything is OK, but still, I couldn't do any useful stuff today besides for solving this problem (fixing the server and doing the rollback).