there is probably some security issue going on with Knight online, I don't think it's a DB hack though. Anyone who has hacked into the DB could easily just do a
"update userData set coins = 999999999999999 where userName = "MrMagic"
"update items set qty = 2 where itemId = "Shard +10" and userName = "MrMagic"
No need to go through other users data unless the person is pissed off at certain persons.