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F-r-ldraledigplannerare/backend/README.md
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jacobh2 02db5430eb Harden the API and the data layer after a security and performance audit
Security
- Every route now requires a login and refuses ids outside the caller's
  workspace with 404: plan, leave-wishes, day-overrides and vacation-days
  were fully anonymous; every other router trusted client-supplied
  workspace/child/parent ids. Scraper sessions are bound to their owner.
- Invitations can no longer be created for a foreign workspace, and a
  redeemer who is already a member (or a full workspace) is refused.
- Production refuses the default JWT secret; API docs are hidden in
  production; a failed migration aborts startup instead of serving.
- Login and register no longer reveal whether an email exists; inactive
  accounts are rejected; /auth/refresh is rate limited.
- The FK scraper writes debug artefacts only when explicitly enabled,
  logs no scraped values or page text, clears the BankID QR as soon as it
  is scanned and purges finished sessions after five minutes.
- Real FK page captures are removed from the tree (history rewrite
  follows); the parser tests use a synthetic fixture.

Performance and correctness
- Plan apply/sync run inside one locked transaction with batched writes
  instead of one commit per row, so a failure mid-batch leaves nothing
  half-applied and concurrent syncs no longer corrupt each other.
- SQLite runs in WAL mode with a busy timeout; 14 indexes cover the
  filters that were full scans; argon2 hashing runs off the event loop;
  responses are gzipped.
- Frontend: a 401 now refreshes the token once and retries, so sessions
  no longer die silently after 15 minutes; every data hook discards
  stale responses; logout clears state even when the server call fails.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CsXCCcDfmV4Sps4ZQSvNEY
2026-09-18 07:54:21 +02:00

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# 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
```
## Configuration
Key env vars (prefix `APP_`, see `.env.example`):
- `APP_ENV` — `development` (default) | `test` | `production`. In production,
`Settings` refuses to start unless `APP_JWT_SECRET` is a random value of at
least 32 characters (the shipped dev default is rejected). Production also
disables `/docs`, `/redoc`, and `/openapi.json`.
- `APP_JWT_SECRET` — required to be a strong, random secret in production.
- `APP_LOG_LEVEL` — default `INFO`.
## 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
```
## Demo data (manual/browser testing)
`scripts/seed_demo.py` seeds a realistic, ready-to-explore workspace through the
normal service/repository layers (no raw SQL) — a couple workspace with a
partner, a child born ~6 months ago, vacation rows for only some years (so the
`is_assumed` badge is visible), day overrides, and a spread of leave wishes
(fixed, flexible, and one deliberately underfunded to show a shortfall +
remedies + surplus advice). Login credentials are fixed and printed at the end.
```bash
uv run python scripts/seed_demo.py # create once; re-running is a no-op
uv run python scripts/seed_demo.py --reset # wipe the demo workspace and rebuild
```
Then open `http://localhost:5173` and log in with the printed `demo@example.com`
credentials. Safe to re-run: without `--reset` it detects the existing demo
user and changes nothing; `--reset` only ever deletes the one demo workspace.
## 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.
> 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).