you just need to delete the column zeny in the character table, and make a table called zeny that have a column called ID that must be the ID of the player and a column with the amount of zeny, i assume that you dont have anything in your DB, because rows will be altered. Also if you use Flux, Ceres or your own acc maker, you need to change the "join code" so unless you know what are you doing, don't change anything.