payments are not deleted oif we delete a wallets, so to get a accurate
total representation of the lnbits balance we need to create the
balances view based on the wallets table, not payments, else deleted
balances will still show up.
2nd, delete_unused_wallets and delete_accounts was never working if
because they never got an updated_at time, so i just check if its null
else i check to timedelta on created_at
