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17 September 2026

The index existed. Postgres ignored it anyway

A statistics problem that looked like a planner bug for three days, and how to tell the difference.

The index existed. Postgres ignored it anyway

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Your retries are the outage

17 September 2026 Your retries are the outageExponential backoff without jitter, and the thundering herd that took four hours to recognise.

Cache invalidation is a routing problem

17 September 2026 Cache invalidation is a routing problemWhy publish-subscribe beat every time-to-live we tried, and the one case where it did not.

Connection pools lie to you

17 September 2026 Connection pools lie to youWhat the pool metrics show, what the database sees, and the gap that hid a leak for a month.

If the queue is the problem, I have probably seen your queue

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