"What Guarantee Does Your Pipeline Provide?"

What They're Really Testing The Three Guarantees The Unlock The 60-Second Framework Why Companies Care At Stripe, payment events use exactly-once because a double-processed payment charge means a customer is billed twice. At Netflix, playback telemetry uses at-least-once because a duplicate play event is corrected by downstream dedup at negligible cost. At Uber, ride fare calculations moved from at-least-once to exactly-once after duplicate fare charges caused a customer trust incident that made the news. The strongest opening: 'The right delivery semantic depends on the business cost of a duplicate versus the business cost of a loss. For financial data, a duplicate charge is catastrophic, so exactly-once. For clickstream, a duplicate click is corrected by dedup at query time, so at-least-