Well, I think the parent was saying that you shouldn't have a balance that is actually relied upon for record-keeping or transactional purposes. If you want to

Well, I think the parent was saying that you shouldn't have a balance that is actually relied upon for record-keeping or transactional purposes. If you want to keep one for optimization purposes (i.e. you are reading more than writing and don't want to constantly sum the ledger table), then that's probably outside the scope of the parent's point.