track /03-sql-query-plans

The Query That Got Slow

An endpoint that was fast at a thousand rows crawls at a million. Read the plan, fix it, and prove which change was the one that mattered.

Warmup ~4h postgresqlpythondocker

Your evidence lives here

Sign in, enroll, and rehearse the failures on purpose — kill the worker, publish the duplicate, pull the queue out from under it. What you paste here is what says you did.