Day 22 of 60: I Built a Production Background Task Pipeline That Processes AI Jobs Asynchronously

** The Problem**

Processing large documents through an AI model takes 30-60 seconds. A synchronous API makes the client wait the entire time. Browsers timeout. Users think it crashed. The experience feels broken.

Yesterday I learned why this happens. Today I built the fix.

## What I Built

A document processing pipeline with FastAPI and PostgreSQL that handles long-running AI tasks in the background. Three task types. Immediate response. Full audit trail.