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docs(db): add ER and ORM diagrams (PlantUML) #452

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marcel merged 3 commits from docs/db-diagrams into main 2026-05-07 07:12:31 +02:00
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docs/architecture/c4-diagrams.md
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Backend-->>Frontend: 200 OK — Document JSON
Frontend-->>User: Refreshed document view
```
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## Database
Entity-relationship and full column reference for the PostgreSQL schema (30 tables, 7 domain groups). Source files in `docs/architecture/db/`.
- **[db-relationships.puml](db/db-relationships.puml)** — Entity relationships: all tables and foreign-key connections, grouped by domain. Start here for an overview.
- **[db-orm.puml](db/db-orm.puml)** — Full schema reference: all columns and types for all 30 tables. Use this when mapping Java entities to database columns.
> Schema as of Flyway V60 (2026-05-06). Open in VS Code with the PlantUML extension (server: `http://heim-nas:8500`).