LinkedInLearning/advanced-sql-query-tuning-performance-optimization-4413111 ? reverse-engineered prompt

Build me a GitHub Codespaces friendly learning repo for advanced SQL query tuning and performance optimization.

I want it to be easy to open, run PostgreSQL right away, and follow along with examples for things like execution plans, indexes, joins, partitioning, and materialized views. Please include a simple setup that works in a dev container, plus clear instructions for how to jump between lesson states using branches.

It should feel like a course companion project, with the final state ready to explore and any starter files organized so I can practice tuning queries without having to set everything up by hand. If you need to check current docs for the best Codespaces or PostgreSQL setup, go ahead and look them up.