| # | Diagram | Question It Answers |
|---|---|---|
| D1 | Request Flow | What is the latency on each hop? What fails if X is slow? |
| D2 | Data Storage | Where is all state? Who owns it? What is the consistency model? |
| D3 | Event-Driven | What are the async dependencies? What are delivery guarantees? |
| D4 | Data Pipeline | How fresh is derived data? What is the schema at each stage? |
| D5 | Distributed Coordination | Where is consensus required? What happens on partition? |
Rule for every diagram: Always show the failure path, not just the happy path.
Rule for D2: Every store must have one named owner.
Rule for D5: Always show the partition case.