# API Changelog

All notable changes to the Telegram Marketing Agent API will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [1.0.0] - 2024-01-14

### Added

#### Authentication & Security
- JWT-based authentication with access and refresh tokens
- API key authentication for programmatic access
- Role-based access control (admin, user, viewer)
- Rate limiting with Redis backend
- Input validation and sanitization
- SQL/NoSQL injection prevention

#### Campaign Management
- Create, read, update, and delete campaigns
- Multiple campaign types (message, invitation, data collection, engagement, custom)
- Campaign execution with real-time progress tracking
- Test mode for campaign validation
- Campaign duplication functionality
- Campaign statistics and analytics

#### Campaign Scheduling
- One-time campaign scheduling
- Recurring campaigns (daily, weekly, monthly, custom)
- Trigger-based campaigns
- Timezone support for schedules
- Schedule preview functionality
- Job management and retry mechanisms

#### User Management
- CRUD operations for Telegram users
- User grouping functionality
- Tag-based user categorization
- Dynamic user segmentation
- Bulk user operations
- CSV/Excel import/export
- Custom user fields support

#### Analytics & Reporting
- Real-time analytics dashboard
- Campaign performance metrics
- User engagement tracking
- Conversion tracking
- Revenue reporting
- Time-series data
- Export functionality

#### Message Templates
- Multi-language template support
- Variable interpolation
- Template categories
- Template versioning
- A/B testing support

#### Workflow Automation
- Multi-step workflow creation
- Conditional logic
- Action triggers
- Workflow templates
- Performance tracking

#### Webhook Integration
- Event-based webhooks
- Configurable event types
- Retry mechanisms
- Webhook testing
- Event logs

#### Data Management
- Automated backups
- Data import/export
- Compliance tools
- Data retention policies

#### Claude AI Integration
- AI-powered content suggestions
- Campaign optimization recommendations
- Audience insights
- Performance predictions

### Security
- HTTPS enforcement
- CORS configuration
- Helmet.js security headers
- Request signing
- API versioning

### Documentation
- Comprehensive API documentation
- Swagger/OpenAPI 3.0 specification
- Interactive API explorer
- Code examples in multiple languages
- Postman collection
- Quick start guide

## API Versioning

The API uses URL versioning. All endpoints are prefixed with `/api/v1/`.

## Breaking Changes Policy

- Breaking changes will only be introduced in major version releases
- Deprecated features will be maintained for at least 6 months
- Migration guides will be provided for all breaking changes

## Deprecation Notices

Currently, there are no deprecated endpoints.

## Migration Guide

### From Beta to v1.0.0

If you were using the beta version of the API, please note the following changes:

1. **Authentication**: The `/auth/token` endpoint has been renamed to `/auth/login`
2. **User Management**: The `/telegram-users` endpoints have been moved to `/users`
3. **Campaign Execution**: The `/campaigns/:id/send` endpoint is now `/campaigns/:id/execute`
4. **Response Format**: All responses now follow a consistent format:
   ```json
   {
     "success": true,
     "data": {},
     "meta": {}
   }
   ```

## Support

For API support, please:
- Check the [API Documentation](./README.md)
- Review [Common Issues](./TROUBLESHOOTING.md)
- Contact support at api-support@example.com

## Upcoming Features

### v1.1.0 (Planned)
- GraphQL API endpoint
- WebSocket support for real-time updates
- Advanced analytics with custom metrics
- Multi-account management
- Enhanced AI capabilities

### v1.2.0 (Planned)
- Video message support
- Voice message campaigns
- Interactive bot responses
- Advanced segmentation with ML
- Predictive analytics