6 notes
A client's API started throwing 500s every weekday afternoon like clockwork. The database was fine. The queries were fast. The problem was a reporting job that quietly hogged every available connection during peak traffic.
A consulting war story about a PostgreSQL-to-MongoDB migration that went sideways, what we missed in planning, and the uncomfortable lessons about knowing when not to migrate.
A client's PostgreSQL writes were getting slower every quarter. The table had 57 indexes. Only 14 of them were ever used. Every INSERT and UPDATE was paying a tax nobody had thought to audit.
A client's dashboard took 11 seconds to render. Everyone blamed the database. The real problem was an ORM doing exactly what we told it to — we just never looked at what that meant.
A client's 45-minute data import gradually became a 14-hour ordeal that bled into business hours, tanked dashboard performance, and made the analytics team distrust their own numbers. The fix wasn't what anyone expected.
We practiced deployments religiously but never tested a rollback. When a release broke checkout and we hit the big red button, we found out half the system couldn't actually go backward.