If you squint, this is similar to how e-commerce billing is done. You have stock keeping units that represent the logical item being sold, and every transaction

If you squint, this is similar to how e-commerce billing is done. You have stock keeping units that represent the logical item being sold, and every transaction clones that row as part of the order record. This way, if the price changes, the item description changes, the images on the item change, etc, you can still have a record of what was actually sold and how much to refund a return etc.