Diagram Knowledge Base

Quick reference for technical diagrams, Mermaid syntax, and C4 model.

Diagram Types Overview

Type	Use Case	When to Use
C4 Context	System boundaries	External actors, systems
C4 Container	Deployable units	Apps, databases, services
C4 Component	Internal structure	Classes, modules in container
Sequence	Interactions	Request flows, protocols
Class	Structure	Domain model, relationships
ER	Data	Database schema
Flowchart	Process	Algorithms, decisions
State	Lifecycle	Entity states, transitions