Module Introduction

1. What This Module Covers

Every module so far taught a concept, then showed how to explain it. This module turns that around. Now you get full case studies, walked end to end, with the concepts showing up only where a real design needs them.

This is the shape the knowledge actually gets used in. Nobody asks you to "define the outbox pattern." The outbox pattern is a way to save a database change and its event in one transaction, so the event cannot get lost.

What you get asked instead is "design order processing for an e-commerce site