# Weekly Progress Report - Backend Development

## Project Overview
Successfully initiated and advanced the backend development for ClipboardHealthAI, a health and fitness platform connecting coaches with users through scheduled calls and training sessions.

## Major Accomplishments

### 1. **Core Infrastructure Setup**
- **FastAPI Framework**: Implemented a robust FastAPI application with proper middleware configuration
- **Database Layer**: Established MongoDB integration with custom Pydantic models for seamless data serialization
- **Authentication System**: Built comprehensive JWT-based authentication with role-based access control
- **Error Handling**: Implemented standardized response wrappers and exception handling

### 2. **User Management System**
- **Complete CRUD Operations**: Full account management including creation, retrieval, updates, and deletion
- **Role-Based Permissions**: Implemented ADMIN, USER, and COACH user types with appropriate access controls
- **Profile Management**: Added profile picture upload functionality with S3 integration
- **User Registration & Login**: Secure authentication endpoints with token generation and verification

### 3. **Call Scheduling & Payment Integration**
- **Stripe Integration**: Implemented payment processing for call bookings with webhook handling
- **Call Management**: Built call creation and management system linking coaches and users
- **Event System**: Developed event creation functionality for scheduling training sessions

### 4. **Coach Availability System**
- **Time Slot Management**: Implemented coach availability tracking and management
- **Availability Queries**: Built endpoints for retrieving coach schedules for users and admins
- **Coach-Specific Features**: Role-based availability updates restricted to coach accounts

### 5. **Supporting Infrastructure**
- **File Storage**: Integrated AWS S3 for secure profile picture storage
- **Timezone Support**: Added timezone search functionality for global user support
- **Health Monitoring**: Implemented health check endpoints for system monitoring
- **CORS Configuration**: Configured cross-origin resource sharing for frontend integration

## Technical Implementation Highlights

- **Modular Architecture**: Clean separation of concerns with dedicated modules for each domain (account, calls, availability, security, events)
- **Database Design**: Custom MongoDB models with proper serialization and enum handling
- **Security**: Comprehensive permission system with dependency injection for endpoint protection
- **Payment Processing**: Production-ready Stripe integration with webhook verification
- **API Design**: RESTful endpoints with consistent request/response patterns

## System Capabilities Delivered

✅ User registration and authentication  
✅ Account management with profile pictures  
✅ Role-based access control (Admin/User/Coach)  
✅ Coach availability management  
✅ Call booking system with Stripe payments  
✅ Event scheduling functionality  
✅ Timezone support for global users  
✅ File upload and storage integration  
✅ Health monitoring and error handling  

The backend foundation is now established with core business logic implemented and ready for frontend integration and further feature development.