Money representation · balances · exactly-once
📖 Money & Idempotency
Notes on handling money correctly in software — why float is a disaster, minor units & rounding, races on balances, double-entry bookkeeping, idempotency keys, the outbox pattern and reconciliation as the final safety net.
Sources: hands-on fintech ledger & payment notes · Designing Data-Intensive Applications · Patterns of Distributed Systems · microservices.io (outbox, saga).
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