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Explanations

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  1. Learning12 Sep 2026 · #08Explain Like I'm ShippingLearn a concept by making the model explain the smallest version you could ship this week, then quiz the gap.InConcept: idempotency keys on a POST that creates an invoice.OutThe quizEasy
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    1. 0:00 The constraintA TypeScript billing API, Postgres already there, one afternoon, no consensus lecture.
    2. 0:08 The tiny versionA unique key column on invoices, the client sends it, a retry with the same key returns the same invoice row.
    3. 0:16 Left outNo new queue, no vendor, no lecture about exactly-once delivery in the abstract.
    4. 0:24 The quizThree questions: where the key is stored, what a second POST returns, and what you do if the key arrives empty.

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