Is “Crash and power-cut safety” supported today, considering printer prints but sale lost?

Atomic writes and journaling so a failure never loses a completed sale. Plan for: printer prints but sale lost; half-written receipt; battery drains. In the catalog it is a plan and nothing is built.

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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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