EU and EEA law (the Omnibus rule) says a price reduction must show the lowest price of the 30 days before the sale started. The app records every price change from install, works out that price per variant, and shows it under the product price in the visitor's language. Progressive reductions keep the first reference. It flags strikethrough prices above the reference and "sales" that follow a raised price, and fixes compare-at prices in one click. No full history, no number shown.
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