Shopify has no undo, and a price that drops by a decimal point looks completely normal in a product list. Guard records your whole catalogue the moment you install it, watches for price and stock changes, and works out how much stock value each change affects. Ordinary trading stays quiet. A bulk update that empties your margin does not. You set the dollar threshold, so Guard interrupts you about money, not activity. Every alert is ranked by dollars and one click restores the previous values.

• Every change priced in dollars of stock value affected
• You set the dollar bar. Below it, Guard stays silent
• One email per bulk update, not one per product
• One click in the alert puts the previous prices back
• A weekly note proves Guard is working when nothing is wrong