Building PennyTap: Three Data Decisions Behind a Piggy Bank Tracker

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The interface is deliberately small: choose a cash denomination or enter an amount, set a goal, and review a history of deposits. The interesting engineering work is in keeping those numbers honest. Here are three decisions from the PennyTap codebase that other developers building a small local tracker may find useful. PennyTap keeps an array of entries. Each entry has an amount, a creation time, an ID, and an optional note.

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