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Separate things becoming one body

Ordered opinions about things worth ordering, technical studies from work, and the notes underneath both. Nothing here is finished; that is the point.

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What p99 latency hides during connection pool saturation28 July 2026A saturated pool does not show up as slow queries. It shows up as fast queries with a long queue in front of them, and percentile latency measured at the wrong boundary will not see it at all.

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A working vault. Most of it stays private — what appears here is the part that stands on its own.