If the Premium Barter Wallet is implemented in SQL the way I think it is, the code (query script plus stored procedures with integrity constraints and triggers) to do what you want will be ugly in some way, most likely performance ugliness; however it is likely that I'm wrong in that speculation.
Originally Posted by Neumi
"No sadder words of tongue or pen are the words: 'Might have been'." -- John Greenleaf Whittier
"Do or do not. There is no try." -- Yoda
On planet Earth, there is a try.
Indeed, in a world and life full of change, the only constant is human nature (A is A, after all :P).
We old vets need to keep in mind those who come after us.