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portal/docs/architecture/c4-component-layers.md
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Дмитрий 431117087f docs(arch): code-derived C4 component-layer diagram from deptrac (gap 4)
docs/architecture/c4-component-layers.md — the Level-3 layer
dependency graph generated by `deptrac analyse --formatter=mermaidjs`
(code-derived, drift-proof). Closes the A6 «C4 drift» gap at the
component level. README diagram index + regenerate note updated.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-17 11:15:34 +03:00

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# C4 — Component view: backend layers
The Level-3 (Component) view — the dependency directions between the backend
layers of `app/app/` (Controller, Service, Model, Job, …). Unlike the
hand-drawn [c4-context.md](c4-context.md), this diagram is **generated from
code** by deptrac, so it cannot drift. See [README](README.md) for the boundary
rule and [ADR-005](../adr/ADR-005-architecture-fitness-deptrac.md).
```mermaid
flowchart TD;
Console -->|3| Service;
Console -->|3| Model;
Console -->|2| Job;
Controller -->|190| Model;
Controller -->|11| Request;
Controller -->|8| Service;
Controller -->|1| Mail;
Controller -->|5| Job;
Controller -->|6| Resource;
Middleware -->|1| Model;
Resource -->|1| Model;
Job -->|75| Model;
Job -->|28| Service;
Job -->|4| Mail;
Job -->|8| Exception;
Mail -->|17| Model;
Provider -->|2| Service;
Repository -->|3| Model;
Service -->|87| Model;
Service -->|1| Repository;
Service -->|13| Exception;
Service -->|7| Mail;
Service -->|5| Job;
```
## Notes
- Edge labels are dependency counts. Every edge shown is an **allowed**
direction — `deptrac analyse` reports **0 violations** (481 allowed
cross-layer dependencies, 977 uncovered framework/vendor references). The
layer model and ruleset live in `app/deptrac.yaml`; the conformance gate is
lefthook pre-commit job 10.
- This is the **Component** level, derived from code. To regenerate after a
change to the layer model:
```bash
cd app && php vendor/bin/deptrac analyse --formatter=mermaidjs
```
- The **Context** level ([c4-context.md](c4-context.md) — external systems) is
not code-derived and stays hand-maintained with the `mermaid` skill.