# Backend — Föräldraledigplannerare

FastAPI + Python 3.14, packages managed with `uv`. Layered architecture
(entities → repositories → services → routers) with dependency injection so the
database backend (SQLite now, Postgres later) is swappable.

## Setup

```bash
uv sync                 # install deps (incl. dev group)
uv run uvicorn app.main:app --reload   # run dev server on :8000
uv run pytest           # run tests with coverage
uv run ruff check .     # lint
```

## Layout

```
app/
  config.py            # pydantic-settings (app config + frozen LeaveRules)
  dependencies.py      # DI factories (pick repo impl by settings.database_type)
  entities/            # plain dataclasses (domain)
  models/              # pydantic API schemas
  repositories/        # abstract interfaces
  repositories_impl/   # concrete impls per backend (sqlite/, postgres/)
  services/            # business logic
  routers/             # FastAPI routes
  db/connection.py     # connection + (dev) schema bootstrap
  utils/               # errors, logger
```

## Reference vertical slice

`VacationDays` is implemented end-to-end (entity → schema → repo interface →
SQLite impl → service → router → tests). **Copy this slice** when adding a new
entity. See `JUNIOR_ONBOARDING.md` in the repo root for task-by-task guidance.

> The inline schema in `db/connection.py` exists only so dev/tests are
> self-contained. Production schema is owned by Alembic migrations (a senior task).