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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+Full Stack FastAPI Template with React frontend. A production-ready template for building modern web applications with FastAPI backend and React frontend, using Docker Compose for both development and deployment.
+
+**Tech Stack:**
+- Backend: FastAPI, SQLModel (ORM), PostgreSQL, Alembic (migrations), JWT auth
+- Frontend: React 19, TypeScript, Vite, TanStack Query/Router, Tailwind CSS, shadcn/ui
+- Infrastructure: Docker Compose, Traefik (reverse proxy)
+- Testing: Pytest (backend), Playwright (frontend E2E)
+
+## Development Setup
+
+### Starting the Stack
+
+```bash
+# Start full stack with hot reload
+docker compose watch
+
+# View logs
+docker compose logs
+docker compose logs backend  # specific service
+```
+
+**URLs:**
+- Frontend: http://localhost:5173
+- Backend API: http://localhost:8000
+- API Docs: http://localhost:8000/docs
+- Adminer (DB): http://localhost:8080
+- Traefik UI: http://localhost:8090
+- MailCatcher: http://localhost:1080
+
+### Local Development (without Docker)
+
+Stop a Docker service and run locally:
+
+```bash
+# Backend
+docker compose stop backend
+cd backend
+fastapi dev app/main.py
+
+# Frontend
+docker compose stop frontend
+cd frontend
+npm run dev
+```
+
+## Backend Development
+
+**Location:** `backend/app/`
+
+### Common Commands
+
+```bash
+cd backend
+
+# Install dependencies
+uv sync
+
+# Activate virtual environment
+source .venv/bin/activate
+
+# Run tests with coverage
+bash scripts/test.sh
+
+# Run tests if stack is running
+docker compose exec backend bash scripts/tests-start.sh
+
+# Run tests with extra args (e.g., stop on first error)
+docker compose exec backend bash scripts/tests-start.sh -x
+
+# Format code
+bash scripts/format.sh
+
+# Lint code
+bash scripts/lint.sh
+
+# Run pre-commit hooks manually
+uv run prek run --all-files
+```
+
+### Database Migrations
+
+Use Alembic for all schema changes:
+
+```bash
+# Enter backend container
+docker compose exec backend bash
+
+# Create migration after model changes
+alembic revision --autogenerate -m "Description of change"
+
+# Apply migrations
+alembic upgrade head
+```
+
+**Important:** Always create migrations when modifying models in `backend/app/models.py`. The application expects the database schema to match the models.
+
+### Architecture
+
+**Key Files:**
+- `app/main.py` - FastAPI app initialization, CORS, Sentry
+- `app/models.py` - SQLModel models (User, Item) with both ORM and Pydantic schemas
+- `app/crud.py` - Database operations (create, read, update, delete)
+- `app/api/main.py` - API router setup
+- `app/api/routes/` - API endpoints organized by resource
+- `app/api/deps.py` - FastAPI dependencies (DB session, auth, user injection)
+- `app/core/config.py` - Settings management with Pydantic
+- `app/core/security.py` - Password hashing, JWT token creation/validation
+- `app/core/db.py` - Database engine and session setup
+
+**Dependency Injection Pattern:**
+- `SessionDep` - SQLModel database session
+- `CurrentUser` - Authenticated user from JWT token
+- `get_current_active_superuser` - Admin-only endpoints
+
+**Model Pattern:**
+SQLModel models use inheritance for different contexts:
+- `Base` classes: Shared fields
+- `Create` classes: API input for creation
+- `Update` classes: API input for updates (optional fields)
+- `Public` classes: API output (excludes sensitive fields)
+- Table classes: Database models (e.g., `User(UserBase, table=True)`)
+
+### Testing
+
+Tests are in `backend/tests/`. Use pytest fixtures for database setup. Coverage reports are in `htmlcov/index.html`.
+
+## Frontend Development
+
+**Location:** `frontend/src/`
+
+### Common Commands
+
+```bash
+cd frontend
+
+# Install Node.js version (using fnm or nvm)
+fnm install && fnm use
+
+# Install dependencies
+npm install
+
+# Start dev server
+npm run dev
+
+# Build for production
+npm run build
+
+# Lint and format with Biome
+npm run lint
+
+# Run E2E tests
+npx playwright test
+
+# Run E2E tests in UI mode
+npx playwright test --ui
+```
+
+### Generate Client
+
+When backend OpenAPI schema changes, regenerate the frontend client:
+
+```bash
+# Automatic (requires backend venv activated)
+./scripts/generate-client.sh
+
+# Manual
+# 1. Start Docker stack
+# 2. Download http://localhost:8000/api/v1/openapi.json to frontend/openapi.json
+# 3. cd frontend && npm run generate-client
+```
+
+**Important:** Regenerate after any backend API changes.
+
+### Architecture
+
+**Key Directories:**
+- `src/routes/` - TanStack Router file-based routing with route components
+- `src/components/` - Reusable React components
+- `src/client/` - Auto-generated OpenAPI client (DO NOT EDIT)
+- `src/hooks/` - Custom React hooks
+- `src/assets/` - Static assets
+
+**Routing:**
+Uses TanStack Router with file-based routing:
+- `__root.tsx` - Root layout
+- `_layout.tsx` - Protected routes layout
+- `_layout/index.tsx`, `_layout/items.tsx`, etc. - Protected pages
+- `login.tsx`, `signup.tsx` - Public routes
+
+**State Management:**
+- TanStack Query for server state
+- React Context for auth state
+- Form state with react-hook-form + Zod validation
+
+**Styling:**
+Tailwind CSS with shadcn/ui components. Dark mode support via next-themes.
+
+## Code Quality
+
+### Pre-commit Hooks
+
+Install `prek` (modern pre-commit alternative) to run linting/formatting before commits:
+
+```bash
+cd backend
+uv run prek install -f
+```
+
+Hooks run automatically on `git commit`. Manual run:
+
+```bash
+cd backend
+uv run prek run --all-files
+```
+
+**Configured Checks:**
+- Ruff (Python linting and formatting)
+- Biome (TypeScript/JavaScript linting and formatting)
+- File checks (TOML, YAML, trailing whitespace, etc.)
+
+## Environment Variables
+
+Edit `.env` file for configuration. **Must change before deployment:**
+- `SECRET_KEY` - JWT signing key
+- `FIRST_SUPERUSER_PASSWORD` - Admin password
+- `POSTGRES_PASSWORD` - Database password
+
+Generate secure keys:
+
+```bash
+python -c "import secrets; print(secrets.token_urlsafe(32))"
+```
+
+## Testing with Custom Domains
+
+For subdomain testing locally, use `localhost.tiangolo.com` (resolves to 127.0.0.1):
+
+```bash
+# Edit .env
+DOMAIN=localhost.tiangolo.com
+
+# Restart
+docker compose watch
+```
+
+Access via:
+- Frontend: http://dashboard.localhost.tiangolo.com
+- Backend: http://api.localhost.tiangolo.com
+
+## Deployment
+
+See `deployment.md` for full deployment instructions. Quick overview:
+
+```bash
+# Build images
+bash scripts/build.sh
+
+# Build and push to registry
+bash scripts/build-push.sh
+
+# Deploy to server
+bash scripts/deploy.sh
+```
+
+## Authentication Flow
+
+1. User logs in via `/api/v1/login/access-token` with email/password
+2. Backend validates credentials, returns JWT access token
+3. Frontend stores token, includes in Authorization header
+4. Backend validates JWT on protected routes via `get_current_user` dependency
+5. User info injected into endpoint via `CurrentUser` dependency
+
+## Key Patterns
+
+**Backend:**
+- Use `SessionDep` for database access in endpoints
+- Use `CurrentUser` for authenticated user
+- Create/update operations return full model objects
+- All models use UUID primary keys
+- Password hashing via passlib with bcrypt
+
+**Frontend:**
+- Use TanStack Query hooks for API calls
+- Use generated client from `src/client/` for type-safe API calls
+- Forms use react-hook-form with Zod schemas
+- Protected routes check auth in layout
+- Error boundaries for error handling