PriceGuardHQ never writes a price below cost or below a floor you set, shows every change before it is written, and ends a sale by itself. Rules by collection, tag, vendor, type, SKUs or whole store: percent or amount off or on, a fixed price, cost plus margin, a sale from compare-at; .99 rounding. Guardrails stop a run that moves a price too far or changes too much. When a sale ends, prices go back; your own edits during it are kept and named. Every write is read back; any run can be undone.

• Floors: never below cost, and never below a price you set
• Preview every price and compare-at change; every write is read back and verified
• A sale ends on schedule and keeps the edits you made during it, and says so