Database Engineering12 min• 1 months ago
A Single Missing Database Index Took Our App from 120ms to 4.8s. Here’s How I Found It
Nothing was “down.” No errors. No alerts. But the app felt slow, unpredictable, and users started leaving. This is a real bug breakdown of how one missing index quietly crippled performance and how I fixed it without rewriting the system.
backend scalabilitysqldatabase optimization+2 more