Implement FastAPI backend with JWT authentication and activity management

[Copilot]

This PR implements a complete FastAPI backend for the La Vida Luca application as specified in the requirements. The backend provides JWT-based authentication and activity management functionality.

🚀 Features Implemented

FastAPI Application Structure

• Main application (apps/backend/src/main.py) with CORS middleware configured for frontend integration
• Modular architecture with separate routers for authentication and activities
• Automatic database table creation on startup
• Health check endpoints and auto-generated API documentation

JWT Authentication System

• User registration and login with secure password hashing using bcrypt
• JWT token generation with configurable expiration times
• Protected route middleware requiring valid authentication
• Proper error handling for invalid credentials and duplicate registrations

Database Models & API Endpoints

# User model with activities relationship
class User(Base):
    id, email, hashed_password, full_name, created_at
    activities = relationship("Activity", back_populates="user")

# Activity model linked to users  
class Activity(Base):
    id, title, description, duration, category, user_id, created_at

API Endpoints:

• POST /auth/register - User registration
• POST /auth/login - Authentication (returns JWT token)
• GET /activities/ - List user's activities (protected)
• POST /activities/ - Create new activity (protected)
• GET /activities/{id} - Get specific activity (protected)

Configuration & Environment

• Environment-based configuration using Pydantic settings
• SQLite database by default (easily configurable for other databases)
• CORS configuration for frontend integration
• Secure defaults with configurable JWT secrets and token expiration

🧪 Testing & Quality

Comprehensive Test Suite

• 9 passing tests covering all authentication flows and API endpoints
• Database isolation ensuring reliable test runs
• Authentication tests: registration, login, invalid credentials, duplicate emails
• API endpoint tests: protected routes, unauthorized access, activity CRUD operations

Modern Python Practices

• Timezone-aware datetime handling (replacing deprecated utcnow())
• Modern Pydantic schemas with ConfigDict instead of legacy Config class
• SQLAlchemy 2.0 patterns with proper imports and session management
• Type hints throughout the codebase

📁 Project Structure

apps/backend/
├── src/
│   ├── main.py           # FastAPI application entry point
│   ├── config.py         # Environment configuration
│   ├── database.py       # Database setup and session management
│   ├── models.py         # SQLAlchemy models (User, Activity)
│   ├── schemas.py        # Pydantic request/response schemas
│   ├── activities.py     # Activities router and endpoints
│   └── auth/
│       ├── router.py     # Authentication endpoints
│       └── utils.py      # JWT and password utilities
├── tests/
│   ├── conftest.py       # Test configuration and fixtures
│   ├── test_auth.py      # Authentication flow tests
│   └── test_api.py       # API endpoint tests
├── requirements.txt      # Python dependencies
├── start.sh             # Development server startup script
└── README.md            # Documentation and setup instructions

🔧 Development Setup

The backend includes a simple startup script for development:

cd apps/backend
./start.sh  # Automatically sets up venv, installs deps, starts server

Access points:

• API: http://localhost:8000
• Interactive docs: http://localhost:8000/docs
• Health check: http://localhost:8000/health

🔒 Security Features

• Password hashing with bcrypt for secure credential storage
• JWT tokens with configurable expiration and secret keys
• Protected routes requiring valid authentication headers
• Input validation using Pydantic schemas
• CORS configuration to control frontend access

✅ Verification

All functionality has been thoroughly tested:

• ✅ Server starts successfully
• ✅ All 9 tests pass
• ✅ Authentication flows work correctly
• ✅ Protected routes require valid tokens
• ✅ Database operations function properly
• ✅ API documentation generates correctly

This implementation provides a solid foundation for the La Vida Luca application's backend needs, following modern FastAPI best practices and providing a secure, well-tested API.

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Project	Deployment	Preview	Comments	Updated (UTC)
la-vida-luca-app	Ready	Preview	Comment	Aug 19, 2025 6:26pm
la-vida-luca-app-zd4o	Ready	Preview	Comment	Aug 19, 2025 6:26pm