The Algorithm That Killed 10,000 Lines of API...

(This is Part 3 of my series on building scalable infrastructure. If you missed them, check out Part 1: Bridging Drizzle & TanStack and Part 2: The Engine-Adapter Pattern). Most backend engineers spend their entire careers writing "Switchboard APIs". You know the type: an endpoint that receives ?include=posts, checks an if statement, and manually adds a SQL JOIN. It is tedious, it is brittle, and frankly, it is boring. If you are a tool creator, you shouldn't be writing switchboards. You should