Business-Management/CLAUDE.md

# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Stack

| Layer | Tech |
|---|---|
| Backend | FastAPI (async), SQLAlchemy 2 (async), Alembic, PostgreSQL |
| Auth | JWT via `python-jose`, bcrypt via `bcrypt` (direct, no passlib) |
| Frontend | React 18, TypeScript, Vite, React Router v6, TanStack Query, Axios |
| Dev DB | PostgreSQL 16 via Docker Compose |

## Commands

### Backend (run from `backend/`)

```bash
# Install
python -m venv .venv && source .venv/bin/activate
pip install -e ".[dev]"

# Run dev server
uvicorn app.main:app --reload

# Lint / format
ruff check . && ruff format .

# Tests
pytest
pytest tests/test_auth.py   # single file

# Migrations
alembic revision --autogenerate -m "describe change"
alembic upgrade head
alembic downgrade -1
```

### Frontend (run from `frontend/`)

```bash
npm install
npm run dev        # Vite dev server at :5173, proxies /api → :8000
npm run build
npm run typecheck
npm run lint
```

### Full stack via Docker

```bash
cp .env.example backend/.env
docker compose up --build
```

## Architecture

### Request flow

```
Browser → Vite dev server (:5173)
  /api/* → proxy → FastAPI (:8000)
    → router → dependency injection (get_db, get_current_user)
      → SQLAlchemy async session → PostgreSQL
```

### Backend layout

- `app/main.py` — FastAPI app, CORS, router registration
- `app/core/config.py` — all settings via `pydantic-settings` (reads `.env`)
- `app/core/security.py` — password hashing and JWT encode/decode
- `app/database.py` — async engine, `AsyncSessionLocal`, `Base` (all models inherit from here)
- `app/models/` — SQLAlchemy ORM models; import them all in `__init__.py` so Alembic detects them
- `app/schemas/` — Pydantic request/response models (separate from ORM models)
- `app/routers/` — one file per resource; mount in `main.py`
- `app/deps.py` — FastAPI dependencies: `get_current_user` validates JWT and returns `User`

### Frontend layout

- `src/api/client.ts` — single Axios instance; all API calls live here, token injected via interceptor
- `src/hooks/useAuth.ts` — token state (localStorage), `login`, `logout`; consumed by pages and `App.tsx`
- `src/pages/` — one file per route; data fetching via TanStack Query
- `src/App.tsx` — route tree; `PrivateRoute` wrapper redirects to `/login` when no token

### Auth flow

1. `POST /api/auth/login` returns a JWT bearer token
2. Token stored in `localStorage`, attached to every request by the Axios interceptor
3. Protected routes call `GET /api/users/me`; `get_current_user` dep validates the token on the server

## Git convention

Always run `git push` immediately after every `git commit`.

## Infrastructure change protocol

After **any** change to Dockerfiles, `docker-compose*.yml`, `nginx.conf`, setup scripts, or installation / usage procedures:

1. **Update `README.md`** — keep the Containers table, ports, image names, and Current State section accurate.
2. **Spin up the dev stack** and verify that login and registration work end-to-end:
   ```bash
   docker compose -f docker-compose.yml -f docker-compose.dev.yml up --build
   ```
3. **Spin up the prod stack** and run the same checks:
   ```bash
   docker compose up --build -d
   ```
4. Confirm each container is running as a non-root user (`docker inspect <container> --format '{{.Config.User}}'`).

## Security hook

A pre-commit hook lives in `.githooks/pre-commit` and runs `scripts/security_check.py` inside a Docker container. It is registered via `git config core.hooksPath .githooks` (already set in this repo).

The hook checks staged files for:
- Hardcoded credentials / secrets
- Dangerous patterns (`eval`, `exec`, `shell=True`, `pickle`)
- Weak cryptography (MD5, SHA1, DES)
- SQL injection risk
- Debug flags left in code
- `bandit` static analysis on all Python files

New clones must run `git config core.hooksPath .githooks` to activate the hook.

## Changelog convention

Every time files are added or modified, append an entry to the relevant file in `changelog/` (one file per date, named `YYYY-MM-DD_<slug>.md`). If a file for today already exists, append to it rather than creating a new one.

Each entry must include:
- A heading with the date and a short description
- `**Timestamp:**` in ISO-8601 format
- A **Summary** sentence
- A **Files Added / Modified / Deleted** list with one-line descriptions

The `README.md` **Current State** section should be kept up to date whenever significant features are added or removed.

---

### Adding a new resource

1. Add ORM model in `app/models/`, import it in `app/models/__init__.py`
2. Run `alembic revision --autogenerate -m "add <resource>"` + `alembic upgrade head`
3. Add Pydantic schemas in `app/schemas/`
4. Add router in `app/routers/`, mount it in `app/main.py`
5. Add API function(s) to `src/api/client.ts`, add page/component, register route in `App.tsx`