# dcalc backend

## Run

```bash
uv sync
python main.py
```

## Test

```bash
uv run pytest -v
```

## Quality

```bash
uv run ruff check .
```

## Runtime Entry

- `main.py`: FastAPI application and uvicorn entry.
- `api/routes/calc.py`: `/api/calc` HTTP route.
- `services/calc_service.py`: calculation orchestration.
- `core/basic/character/`: character calculation implementation.
- `core/basic/equipment.py`: equipment data models and compatibility access.
- `core/basic/equipment_registry.py`: equipment version registry and cache.
- `database/connect.py`: SQLite and Redis connections.

## Compatibility Rules

- Do not change `/calc` request and response contract without frontend migration approval.
- Do not change frontendNew result data shape during backend refactors.
- Keep Skill and Forge business formulas behavior-compatible unless a dedicated formula task says otherwise.