Data is left in transaction fields after deleting all orders

I might be completely off here for some reason I'm not aware of, but if I delete all completed orders from a site, the transaction count is not affected. It would be useful with a feature to wipe the transaction count instead of having to go into the database and clear it out.

- Wipe everything button.

- Checkbox when deleting orders, (unselected by default) to delete transaction as well.