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 design doc lives here

Sign in, enroll, and decide the shape before you build it — then find out, in the write-up, how much of it survived contact.