# Changelog

## v1.0.0 - Production Ready Release

### ✨ New Features
- **Production API Server**: Express.js server with TypeScript
- **Security**: Input validation, rate limiting, CORS protection
- **Monitoring**: Health checks, structured logging, error tracking
- **Docker Support**: Complete containerization with docker-compose
- **Documentation**: Comprehensive API and deployment guides

### 🛡️ Security Improvements
- Input validation with Zod schemas
- Rate limiting (configurable, default 10/15min)
- Security headers (Helmet.js)
- Privacy-protected logging (email/IP masking)
- Environment variable management
- CORS restrictions

### 📊 Monitoring & Logging
- Structured JSON logging
- Health check endpoint (`/health`)
- Request/response logging
- Error tracking with correlation IDs
- Performance metrics

### 🏗️ Architecture Changes
- Clean separation of frontend (template designer) and backend (API)
- TypeScript throughout
- Configuration management
- Service layer architecture
- Comprehensive error handling

### 📚 Documentation Cleanup
- **Consolidated**: Reduced from 7 docs to 4 focused guides
- **Organized**: Moved all docs to `/docs` folder
- **Comprehensive**: Complete API reference with examples
- **Practical**: Step-by-step deployment instructions

### 🔧 Developer Experience
- Hot reload development servers
- Type checking scripts
- Linting and validation
- Docker development environment
- Clear npm scripts

### 📁 File Structure Changes
```
Before:                          After:
├── README.md                   ├── README.md (clean, focused)
├── ARCHITECTURE_GUIDE.md       ├── docs/
├── RESEND_INTEGRATION.md       │   ├── README.md
├── SIMPLE_INTEGRATION_EXAMPLE  │   ├── API.md
├── PRODUCTION_DEPLOYMENT.md    │   ├── DEPLOYMENT.md
├── PRODUCTION_READY_SUMMARY    │   ├── PRODUCTION_DEPLOYMENT.md
├── SECURITY_IMPROVEMENTS.md    │   └── SECURITY.md
├── backend-example.js          ├── server.ts (production server)
└── ...                         └── ...
```

### 🚀 Deployment Options
- **Docker**: `docker-compose up -d`
- **Node.js**: `npm start`
- **Cloud**: Vercel, Railway, Heroku ready

### Breaking Changes
- Removed development-only backend example
- Consolidated documentation (old links may break)
- Environment variables now required for production

### Migration Guide
1. Copy `.env.example` to `.env`
2. Add your Resend API key and domain
3. Use `npm run server:dev` instead of old backend example
4. Update documentation links to `/docs` folder

---

## Previous Versions

### v0.1.0 - Initial Release
- Basic React template designer
- Sample email templates
- Development-only features