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Every deploy was losing a handful of HTTP requests, but nobody noticed until a payment callback disappeared. The fix wasn't in the deployment pipeline — it was in the application code that never learned how to shut down.

A routine ANALYZE flipped a Postgres query plan from an index scan to a sequential scan, and our API went from 12ms to 8 seconds. Here's what we learned about a failure mode most teams never think about.

A client moved their reads to database replicas for performance. The latency numbers looked great — until customers started getting charged twice and inventory counts drifted from reality.

A client found one of their API keys in a public error log. Tracing where that key actually lived took longer than fixing the leak — and revealed a secrets management problem nobody wanted to own.

A client's payment provider was sending webhook notifications correctly. Their system acknowledged every one. And then quietly threw most of them away.