How risky is “Offline-first design” to get wrong, considering power loss mid-sale?

The shop must keep selling without internet. Every sale is written locally first. Plan for: power loss mid-sale; clock errors; disk full. It is designed in a document and no code exists.

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The tag above says how real the answer is. Answers describe the plan in the repository and design documents. No app is released. Where an answer touches tax or law, treat it as a theme to verify with a qualified local adviser.

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