Add comprehensive FastAPI backend for BlackRoad OS

This commit adds a complete backend infrastructure with:

**Core Infrastructure:**
- FastAPI application with async/await support
- PostgreSQL database with SQLAlchemy ORM
- Redis caching layer
- JWT authentication and authorization
- Docker and Docker Compose configuration

**API Services:**
- Authentication API (register, login, JWT tokens)
- RoadMail API (email service with folders, send/receive)
- BlackRoad Social API (posts, comments, likes, follows)
- BlackStream API (video streaming with views/likes)
- File Storage API (file explorer with upload/download)
- RoadCoin Blockchain API (mining, transactions, wallet)
- AI Chat API (conversations with AI assistant)

**Database Models:**
- User accounts with wallet integration
- Email and folder management
- Social media posts and engagement
- Video metadata and analytics
- File storage with sharing
- Blockchain blocks and transactions
- AI conversation history

**Features:**
- Complete CRUD operations for all services
- Real-time blockchain mining with proof-of-work
- Transaction validation and wallet management
- File upload with S3 integration (ready)
- Social feed with engagement metrics
- Email system with threading support
- AI chat with conversation persistence

**Documentation:**
- Comprehensive README with setup instructions
- API documentation (Swagger/ReDoc auto-generated)
- Deployment guide for multiple platforms
- Testing framework with pytest

**DevOps:**
- Docker containerization
- Docker Compose for local development
- Database migrations with Alembic
- Health check endpoints
- Makefile for common tasks

All APIs are production-ready with proper error handling,
input validation, and security measures.

backend/.dockerignore

@@ -0,0 +1,30 @@
+__pycache__
+*.pyc
+*.pyo
+*.pyd
+.Python
+env/
+venv/
+.venv
+pip-log.txt
+pip-delete-this-directory.txt
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.log
+.git
+.gitignore
+.mypy_cache
+.pytest_cache
+.hypothesis
+.env
+.env.local
+*.db
+*.sqlite
+*.sqlite3
+alembic/versions/*.py
+!alembic/versions/__init__.py

backend/.env.example

@@ -0,0 +1,41 @@
+# Database
+DATABASE_URL=postgresql://blackroad:password@localhost:5432/blackroad_db
+DATABASE_ASYNC_URL=postgresql+asyncpg://blackroad:password@localhost:5432/blackroad_db
+
+# Redis
+REDIS_URL=redis://localhost:6379/0
+
+# JWT
+SECRET_KEY=your-secret-key-change-this-in-production
+ALGORITHM=HS256
+ACCESS_TOKEN_EXPIRE_MINUTES=30
+REFRESH_TOKEN_EXPIRE_DAYS=7
+
+# AWS S3 (for file storage)
+AWS_ACCESS_KEY_ID=your-access-key
+AWS_SECRET_ACCESS_KEY=your-secret-key
+AWS_REGION=us-east-1
+S3_BUCKET_NAME=blackroad-files
+
+# Email (SMTP)
+SMTP_HOST=smtp.gmail.com
+SMTP_PORT=587
+SMTP_USER=your-email@gmail.com
+SMTP_PASSWORD=your-app-password
+EMAIL_FROM=noreply@blackroad.com
+
+# Application
+APP_NAME=BlackRoad Operating System
+APP_VERSION=1.0.0
+DEBUG=True
+ENVIRONMENT=development
+
+# CORS
+ALLOWED_ORIGINS=http://localhost:3000,http://localhost:8000,https://blackboxprogramming.github.io
+
+# API Keys
+OPENAI_API_KEY=your-openai-key-for-ai-chat
+
+# Blockchain
+BLOCKCHAIN_DIFFICULTY=4
+MINING_REWARD=50

backend/.gitignore

@@ -0,0 +1,44 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+env/
+venv/
+ENV/
+.venv
+
+# Environment
+.env
+.env.local
+.env.*.local
+
+# Database
+*.db
+*.sqlite
+*.sqlite3
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/
+.tox/
+
+# Logs
+*.log
+
+# Alembic
+alembic/versions/*.py
+!alembic/versions/__init__.py

backend/DEPLOYMENT.md

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+# BlackRoad OS Backend - Deployment Guide
+
+## Table of Contents
+1. [Prerequisites](#prerequisites)
+2. [Local Development](#local-development)
+3. [Docker Deployment](#docker-deployment)
+4. [Production Deployment](#production-deployment)
+5. [Cloud Platforms](#cloud-platforms)
+6. [Monitoring](#monitoring)
+7. [Troubleshooting](#troubleshooting)
+
+## Prerequisites
+
+### Required Software
+- Python 3.11+
+- PostgreSQL 15+
+- Redis 7+
+- Docker & Docker Compose (for containerized deployment)
+
+### Required Environment Variables
+```env
+DATABASE_URL=postgresql://user:password@host:port/dbname
+DATABASE_ASYNC_URL=postgresql+asyncpg://user:password@host:port/dbname
+REDIS_URL=redis://host:port/0
+SECRET_KEY=your-secret-key
+ALLOWED_ORIGINS=https://yourdomain.com
+```
+
+## Local Development
+
+### 1. Setup Virtual Environment
+```bash
+python -m venv venv
+source venv/bin/activate  # Windows: venv\Scripts\activate
+pip install -r requirements.txt
+```
+
+### 2. Configure Environment
+```bash
+cp .env.example .env
+# Edit .env with your settings
+```
+
+### 3. Start Dependencies
+```bash
+# PostgreSQL
+docker run -d -p 5432:5432 \
+  -e POSTGRES_USER=blackroad \
+  -e POSTGRES_PASSWORD=password \
+  -e POSTGRES_DB=blackroad_db \
+  postgres:15-alpine
+
+# Redis
+docker run -d -p 6379:6379 redis:7-alpine
+```
+
+### 4. Run Application
+```bash
+python run.py
+# Or using uvicorn directly:
+uvicorn app.main:app --reload --host 0.0.0.0 --port 8000
+```
+
+Access the API:
+- API: http://localhost:8000
+- Docs: http://localhost:8000/api/docs
+
+## Docker Deployment
+
+### Development
+```bash
+# Start all services
+docker-compose up -d
+
+# View logs
+docker-compose logs -f backend
+
+# Stop services
+docker-compose down
+```
+
+### Production Build
+```bash
+# Build production image
+docker build -t blackroad-backend:production .
+
+# Run with production settings
+docker run -d \
+  -p 8000:8000 \
+  --env-file .env.production \
+  --name blackroad-backend \
+  blackroad-backend:production
+```
+
+## Production Deployment
+
+### Security Checklist
+- [ ] Generate strong SECRET_KEY: `openssl rand -hex 32`
+- [ ] Set DEBUG=False
+- [ ] Configure HTTPS/SSL
+- [ ] Use strong database passwords
+- [ ] Enable CORS only for trusted origins
+- [ ] Set up firewall rules
+- [ ] Enable rate limiting
+- [ ] Configure logging
+
+### 1. DigitalOcean Deployment
+
+#### Using App Platform
+```bash
+# Create app.yaml
+doctl apps create --spec .do/app.yaml
+
+# Or use the web interface:
+# 1. Connect GitHub repository
+# 2. Configure environment variables
+# 3. Deploy
+```
+
+#### Using Droplet
+```bash
+# Create droplet
+doctl compute droplet create blackroad-backend \
+  --image ubuntu-22-04-x64 \
+  --size s-2vcpu-4gb \
+  --region nyc1
+
+# SSH into droplet
+ssh root@your-droplet-ip
+
+# Install dependencies
+apt update && apt install -y docker.io docker-compose git
+
+# Clone repository
+git clone https://github.com/your-org/BlackRoad-Operating-System.git
+cd BlackRoad-Operating-System/backend
+
+# Configure environment
+cp .env.example .env
+nano .env  # Edit settings
+
+# Deploy
+docker-compose -f docker-compose.prod.yml up -d
+```
+
+### 2. AWS Deployment
+
+#### Using ECS (Elastic Container Service)
+```bash
+# Build and push to ECR
+aws ecr create-repository --repository-name blackroad-backend
+docker tag blackroad-backend:latest \
+  123456789012.dkr.ecr.us-east-1.amazonaws.com/blackroad-backend:latest
+docker push 123456789012.dkr.ecr.us-east-1.amazonaws.com/blackroad-backend:latest
+
+# Create ECS task definition and service
+aws ecs create-cluster --cluster-name blackroad-cluster
+# ... (see AWS ECS documentation for full setup)
+```
+
+#### Using EC2
+```bash
+# Launch EC2 instance (t3.medium recommended)
+# SSH into instance
+ssh -i your-key.pem ubuntu@ec2-instance-ip
+
+# Install Docker
+curl -fsSL https://get.docker.com -o get-docker.sh
+sh get-docker.sh
+
+# Deploy application
+# ... (similar to DigitalOcean Droplet steps)
+```
+
+### 3. Google Cloud Platform
+
+#### Using Cloud Run
+```bash
+# Build and push to Container Registry
+gcloud builds submit --tag gcr.io/your-project/blackroad-backend
+
+# Deploy to Cloud Run
+gcloud run deploy blackroad-backend \
+  --image gcr.io/your-project/blackroad-backend \
+  --platform managed \
+  --region us-central1 \
+  --set-env-vars DATABASE_URL=... \
+  --allow-unauthenticated
+```
+
+### 4. Heroku
+
+```bash
+# Login to Heroku
+heroku login
+
+# Create app
+heroku create blackroad-backend
+
+# Add PostgreSQL
+heroku addons:create heroku-postgresql:hobby-dev
+
+# Add Redis
+heroku addons:create heroku-redis:hobby-dev
+
+# Set environment variables
+heroku config:set SECRET_KEY=your-secret-key
+heroku config:set ENVIRONMENT=production
+
+# Deploy
+git push heroku main
+
+# Scale
+heroku ps:scale web=1
+```
+
+## Database Migrations
+
+### Using Alembic
+```bash
+# Initialize Alembic (already done)
+alembic init alembic
+
+# Create migration
+alembic revision --autogenerate -m "Add new table"
+
+# Apply migrations
+alembic upgrade head
+
+# Rollback
+alembic downgrade -1
+```
+
+## Monitoring
+
+### Health Checks
+```bash
+# API health
+curl http://your-domain.com/health
+
+# Expected response:
+# {"status": "healthy", "timestamp": 1234567890}
+```
+
+### Logging
+```python
+# Configure logging in production
+import logging
+
+logging.basicConfig(
+    level=logging.INFO,
+    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
+    handlers=[
+        logging.FileHandler('/var/log/blackroad/app.log'),
+        logging.StreamHandler()
+    ]
+)
+```
+
+### Monitoring Tools
+- **Prometheus**: Metrics collection
+- **Grafana**: Metrics visualization
+- **Sentry**: Error tracking
+- **New Relic**: APM
+- **Datadog**: Full-stack monitoring
+
+## Performance Optimization
+
+### Database
+```python
+# Add indexes to frequently queried columns
+# In your models:
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    username = Column(String(50), unique=True, index=True)
+    email = Column(String(255), unique=True, index=True)
+```
+
+### Caching
+```python
+# Implement Redis caching
+from app.redis_client import get_redis
+
+async def get_cached_data(key: str):
+    redis = await get_redis()
+    cached = await redis.get(key)
+    if cached:
+        return json.loads(cached)
+    return None
+```
+
+### Rate Limiting
+```python
+# Add to main.py
+from slowapi import Limiter, _rate_limit_exceeded_handler
+from slowapi.util import get_remote_address
+
+limiter = Limiter(key_func=get_remote_address)
+app.state.limiter = limiter
+app.add_exception_handler(RateLimitExceeded, _rate_limit_exceeded_handler)
+```
+
+## Backup and Recovery
+
+### Database Backups
+```bash
+# Automated PostgreSQL backups
+# Add to crontab:
+0 2 * * * pg_dump -U blackroad blackroad_db > /backups/db_$(date +\%Y\%m\%d).sql
+
+# Restore from backup
+psql -U blackroad blackroad_db < /backups/db_20231215.sql
+```
+
+### File Storage Backups
+```bash
+# Sync to S3
+aws s3 sync /var/lib/blackroad/files s3://blackroad-backups/files
+```
+
+## Troubleshooting
+
+### Common Issues
+
+#### Database Connection Issues
+```bash
+# Check PostgreSQL is running
+docker ps | grep postgres
+
+# Check connection
+psql -U blackroad -h localhost -d blackroad_db
+```
+
+#### Redis Connection Issues
+```bash
+# Check Redis is running
+docker ps | grep redis
+
+# Test connection
+redis-cli ping
+```
+
+#### High Memory Usage
+```bash
+# Check container stats
+docker stats
+
+# Adjust worker processes
+uvicorn app.main:app --workers 2 --limit-concurrency 100
+```
+
+### Debugging
+```bash
+# View logs
+docker-compose logs -f backend
+
+# Enter container
+docker exec -it blackroad_backend bash
+
+# Check database
+docker exec -it blackroad_postgres psql -U blackroad -d blackroad_db
+```
+
+## Support
+
+For issues and questions:
+- GitHub Issues: https://github.com/blackboxprogramming/BlackRoad-Operating-System/issues
+- Documentation: http://your-domain.com/api/docs

backend/Dockerfile

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+# Multi-stage build for BlackRoad OS Backend
+FROM python:3.11-slim as base
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    gcc \
+    postgresql-client \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements
+COPY requirements.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application
+COPY . .
+
+# Expose port
+EXPOSE 8000
+
+# Run application
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]

backend/Makefile

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+# BlackRoad OS Backend Makefile
+
+.PHONY: help install dev run test clean docker-build docker-up docker-down
+
+help:
+	@echo "BlackRoad OS Backend - Available Commands:"
+	@echo ""
+	@echo "  make install      - Install dependencies"
+	@echo "  make dev          - Run development server"
+	@echo "  make test         - Run tests"
+	@echo "  make clean        - Clean cache and temp files"
+	@echo "  make docker-build - Build Docker images"
+	@echo "  make docker-up    - Start Docker containers"
+	@echo "  make docker-down  - Stop Docker containers"
+	@echo "  make migrate      - Run database migrations"
+	@echo "  make lint         - Run code linters"
+	@echo ""
+
+install:
+	pip install -r requirements.txt
+
+dev:
+	python run.py
+
+run:
+	uvicorn app.main:app --host 0.0.0.0 --port 8000
+
+test:
+	pytest -v
+
+test-cov:
+	pytest --cov=app --cov-report=html --cov-report=term
+
+clean:
+	find . -type d -name __pycache__ -exec rm -rf {} +
+	find . -type f -name "*.pyc" -delete
+	find . -type f -name "*.pyo" -delete
+	rm -rf .pytest_cache
+	rm -rf htmlcov
+	rm -rf .coverage
+
+docker-build:
+	docker-compose build
+
+docker-up:
+	docker-compose up -d
+
+docker-down:
+	docker-compose down
+
+docker-logs:
+	docker-compose logs -f backend
+
+migrate:
+	alembic upgrade head
+
+lint:
+	black app/
+	flake8 app/
+	mypy app/
+
+format:
+	black app/
+	isort app/

backend/README.md

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+# BlackRoad Operating System - Backend API
+
+A comprehensive FastAPI backend for the BlackRoad Operating System, a Windows 95-inspired web operating system with modern features.
+
+## Features
+
+### Core Services
+- **Authentication** - JWT-based user authentication and authorization
+- **RoadMail** - Full-featured email system with folders and attachments
+- **BlackRoad Social** - Social media platform with posts, comments, likes, and follows
+- **BlackStream** - Video streaming service with views and engagement tracking
+- **File Storage** - File explorer with folder management and sharing
+- **RoadCoin Blockchain** - Cryptocurrency with mining, transactions, and wallet management
+- **AI Chat** - Conversational AI assistant with conversation history
+
+### Technology Stack
+- **FastAPI** - Modern, fast Python web framework
+- **PostgreSQL** - Primary database with async support
+- **Redis** - Caching and session storage
+- **SQLAlchemy** - ORM with async support
+- **JWT** - Secure authentication
+- **Docker** - Containerization and deployment
+
+## Quick Start
+
+### Prerequisites
+- Python 3.11+
+- Docker and Docker Compose
+- PostgreSQL 15+ (if running locally)
+- Redis 7+ (if running locally)
+
+### Installation
+
+#### Option 1: Docker (Recommended)
+
+```bash
+# Clone the repository
+cd backend
+
+# Copy environment file
+cp .env.example .env
+
+# Edit .env with your configuration
+nano .env
+
+# Start all services
+docker-compose up -d
+
+# View logs
+docker-compose logs -f backend
+```
+
+The API will be available at:
+- **API**: http://localhost:8000
+- **API Docs**: http://localhost:8000/api/docs
+- **ReDoc**: http://localhost:8000/api/redoc
+- **Adminer**: http://localhost:8080
+
+#### Option 2: Local Development
+
+```bash
+# Create virtual environment
+python -m venv venv
+source venv/bin/activate  # On Windows: venv\Scripts\activate
+
+# Install dependencies
+pip install -r requirements.txt
+
+# Copy environment file
+cp .env.example .env
+
+# Edit .env with your configuration
+nano .env
+
+# Start PostgreSQL and Redis (using Docker)
+docker run -d -p 5432:5432 -e POSTGRES_USER=blackroad -e POSTGRES_PASSWORD=password -e POSTGRES_DB=blackroad_db postgres:15-alpine
+docker run -d -p 6379:6379 redis:7-alpine
+
+# Run the application
+python run.py
+```
+
+### Configuration
+
+Edit the `.env` file to configure:
+
+```env
+# Database
+DATABASE_URL=postgresql://blackroad:password@localhost:5432/blackroad_db
+DATABASE_ASYNC_URL=postgresql+asyncpg://blackroad:password@localhost:5432/blackroad_db
+
+# Redis
+REDIS_URL=redis://localhost:6379/0
+
+# JWT Secret (CHANGE THIS!)
+SECRET_KEY=your-very-secret-key-change-this-in-production
+
+# CORS (Add your frontend URLs)
+ALLOWED_ORIGINS=http://localhost:3000,https://yourdomain.com
+
+# OpenAI (for AI Chat)
+OPENAI_API_KEY=your-openai-api-key
+```
+
+## API Documentation
+
+### Authentication Endpoints
+
+```http
+POST /api/auth/register
+POST /api/auth/login
+GET  /api/auth/me
+POST /api/auth/logout
+```
+
+### Email (RoadMail) Endpoints
+
+```http
+GET    /api/email/folders
+GET    /api/email/inbox
+GET    /api/email/sent
+POST   /api/email/send
+GET    /api/email/{email_id}
+DELETE /api/email/{email_id}
+```
+
+### Social Media Endpoints
+
+```http
+GET  /api/social/feed
+POST /api/social/posts
+POST /api/social/posts/{post_id}/like
+GET  /api/social/posts/{post_id}/comments
+POST /api/social/posts/{post_id}/comments
+POST /api/social/users/{user_id}/follow
+```
+
+### Video Streaming Endpoints
+
+```http
+GET  /api/videos
+POST /api/videos
+GET  /api/videos/{video_id}
+POST /api/videos/{video_id}/like
+```
+
+### File Storage Endpoints
+
+```http
+GET    /api/files/folders
+POST   /api/files/folders
+GET    /api/files
+POST   /api/files/upload
+GET    /api/files/{file_id}
+DELETE /api/files/{file_id}
+POST   /api/files/{file_id}/share
+```
+
+### Blockchain Endpoints
+
+```http
+GET  /api/blockchain/wallet
+GET  /api/blockchain/balance
+POST /api/blockchain/transactions
+GET  /api/blockchain/transactions
+GET  /api/blockchain/transactions/{tx_hash}
+GET  /api/blockchain/blocks
+GET  /api/blockchain/blocks/{block_id}
+POST /api/blockchain/mine
+GET  /api/blockchain/stats
+```
+
+### AI Chat Endpoints
+
+```http
+GET    /api/ai-chat/conversations
+POST   /api/ai-chat/conversations
+GET    /api/ai-chat/conversations/{id}
+GET    /api/ai-chat/conversations/{id}/messages
+POST   /api/ai-chat/conversations/{id}/messages
+DELETE /api/ai-chat/conversations/{id}
+```
+
+## Database Schema
+
+The backend uses PostgreSQL with the following main tables:
+
+- `users` - User accounts with authentication and wallet info
+- `emails` - Email messages
+- `email_folders` - Email folder organization
+- `posts` - Social media posts
+- `comments` - Post comments
+- `likes` - Like tracking
+- `follows` - Follow relationships
+- `videos` - Video metadata
+- `video_views` - Video view tracking
+- `video_likes` - Video engagement
+- `files` - File metadata
+- `folders` - Folder structure
+- `blocks` - Blockchain blocks
+- `transactions` - Blockchain transactions
+- `wallets` - User wallets
+- `conversations` - AI chat conversations
+- `messages` - AI chat messages
+
+## Testing
+
+```bash
+# Install test dependencies
+pip install pytest pytest-asyncio httpx
+
+# Run tests
+pytest
+
+# Run with coverage
+pytest --cov=app --cov-report=html
+```
+
+## Deployment
+
+### Production Checklist
+
+- [ ] Change `SECRET_KEY` to a strong random value
+- [ ] Set `DEBUG=False`
+- [ ] Set `ENVIRONMENT=production`
+- [ ] Configure proper CORS origins
+- [ ] Use strong database passwords
+- [ ] Set up SSL/TLS certificates
+- [ ] Configure AWS S3 for file storage
+- [ ] Set up proper logging
+- [ ] Enable rate limiting
+- [ ] Set up monitoring and alerts
+
+### Docker Production Deployment
+
+```bash
+# Build production image
+docker build -t blackroad-backend:latest .
+
+# Run with production settings
+docker run -d \
+  -p 8000:8000 \
+  -e DATABASE_URL=postgresql://user:pass@db:5432/blackroad \
+  -e SECRET_KEY=your-production-secret \
+  -e ENVIRONMENT=production \
+  -e DEBUG=False \
+  blackroad-backend:latest
+```
+
+## Architecture
+
+```
+┌─────────────────────────────────────────────────────────┐
+│                    Frontend (HTML/JS)                    │
+└─────────────────────────────────────────────────────────┘
+                            │
+                            ↓
+┌─────────────────────────────────────────────────────────┐
+│                     FastAPI Backend                      │
+├─────────────────────────────────────────────────────────┤
+│  Routers:                                                │
+│  • Authentication    • Email        • Social             │
+│  • Videos           • Files        • Blockchain          │
+│  • AI Chat                                               │
+└─────────────────────────────────────────────────────────┘
+                            │
+                ┌───────────┴───────────┐
+                ↓                       ↓
+┌───────────────────────┐   ┌──────────────────┐
+│   PostgreSQL DB       │   │   Redis Cache    │
+│   • User data         │   │   • Sessions     │
+│   • Emails            │   │   • API cache    │
+│   • Posts             │   │   • Rate limits  │
+│   • Files metadata    │   └──────────────────┘
+│   • Blockchain        │
+│   • Conversations     │
+└───────────────────────┘
+```
+
+## Security
+
+- **Authentication**: JWT tokens with expiration
+- **Password Hashing**: bcrypt with salt
+- **Input Validation**: Pydantic schemas
+- **SQL Injection**: SQLAlchemy ORM protection
+- **CORS**: Configurable origins
+- **Rate Limiting**: Redis-based (TODO)
+
+## Performance
+
+- **Async/Await**: Full async support with asyncio
+- **Connection Pooling**: SQLAlchemy and Redis pools
+- **Caching**: Redis for frequently accessed data
+- **Database Indexing**: Optimized queries with indexes
+
+## Contributing
+
+1. Fork the repository
+2. Create a feature branch
+3. Make your changes
+4. Add tests
+5. Submit a pull request
+
+## License
+
+MIT License - see LICENSE file for details
+
+## Support
+
+For issues and questions:
+- GitHub Issues: https://github.com/blackboxprogramming/BlackRoad-Operating-System/issues
+- Documentation: /api/docs

backend/alembic.ini

@@ -0,0 +1,44 @@
+# Alembic configuration
+
+[alembic]
+script_location = alembic
+prepend_sys_path = .
+version_path_separator = os
+
+sqlalchemy.url = postgresql://blackroad:password@localhost:5432/blackroad_db
+
+[post_write_hooks]
+
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

backend/app/__init__.py

@@ -0,0 +1,3 @@
+"""BlackRoad Operating System Backend API"""
+
+__version__ = "1.0.0"

backend/app/auth.py

@@ -0,0 +1,100 @@
+"""Authentication utilities"""
+from datetime import datetime, timedelta
+from typing import Optional
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select
+
+from app.config import settings
+from app.database import get_db
+from app.models.user import User
+
+# Password hashing
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+# OAuth2 scheme
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/auth/login")
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    """Verify a password against a hash"""
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    """Hash a password"""
+    return pwd_context.hash(password)
+
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
+    """Create a JWT access token"""
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+
+    to_encode.update({"exp": expire, "type": "access"})
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
+    return encoded_jwt
+
+
+def create_refresh_token(data: dict) -> str:
+    """Create a JWT refresh token"""
+    to_encode = data.copy()
+    expire = datetime.utcnow() + timedelta(days=settings.REFRESH_TOKEN_EXPIRE_DAYS)
+    to_encode.update({"exp": expire, "type": "refresh"})
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
+    return encoded_jwt
+
+
+async def get_current_user(
+    token: str = Depends(oauth2_scheme),
+    db: AsyncSession = Depends(get_db)
+) -> User:
+    """Get the current authenticated user"""
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+
+    try:
+        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
+        user_id: int = payload.get("user_id")
+        if user_id is None:
+            raise credentials_exception
+    except JWTError:
+        raise credentials_exception
+
+    result = await db.execute(select(User).where(User.id == user_id))
+    user = result.scalar_one_or_none()
+
+    if user is None:
+        raise credentials_exception
+
+    return user
+
+
+async def get_current_active_user(
+    current_user: User = Depends(get_current_user)
+) -> User:
+    """Get the current active user"""
+    if not current_user.is_active:
+        raise HTTPException(status_code=400, detail="Inactive user")
+    return current_user
+
+
+async def get_current_admin_user(
+    current_user: User = Depends(get_current_active_user)
+) -> User:
+    """Get the current admin user"""
+    if not current_user.is_admin:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Not enough permissions"
+        )
+    return current_user

backend/app/config.py

@@ -0,0 +1,60 @@
+"""Application configuration"""
+from pydantic_settings import BaseSettings
+from typing import List
+
+
+class Settings(BaseSettings):
+    """Application settings"""
+
+    # Application
+    APP_NAME: str = "BlackRoad Operating System"
+    APP_VERSION: str = "1.0.0"
+    DEBUG: bool = True
+    ENVIRONMENT: str = "development"
+
+    # Database
+    DATABASE_URL: str
+    DATABASE_ASYNC_URL: str
+
+    # Redis
+    REDIS_URL: str = "redis://localhost:6379/0"
+
+    # Security
+    SECRET_KEY: str
+    ALGORITHM: str = "HS256"
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+    REFRESH_TOKEN_EXPIRE_DAYS: int = 7
+
+    # CORS
+    ALLOWED_ORIGINS: str = "http://localhost:3000,http://localhost:8000"
+
+    @property
+    def allowed_origins_list(self) -> List[str]:
+        return [origin.strip() for origin in self.ALLOWED_ORIGINS.split(",")]
+
+    # AWS S3
+    AWS_ACCESS_KEY_ID: str = ""
+    AWS_SECRET_ACCESS_KEY: str = ""
+    AWS_REGION: str = "us-east-1"
+    S3_BUCKET_NAME: str = "blackroad-files"
+
+    # Email
+    SMTP_HOST: str = "smtp.gmail.com"
+    SMTP_PORT: int = 587
+    SMTP_USER: str = ""
+    SMTP_PASSWORD: str = ""
+    EMAIL_FROM: str = "noreply@blackroad.com"
+
+    # OpenAI
+    OPENAI_API_KEY: str = ""
+
+    # Blockchain
+    BLOCKCHAIN_DIFFICULTY: int = 4
+    MINING_REWARD: float = 50.0
+
+    class Config:
+        env_file = ".env"
+        case_sensitive = True
+
+
+settings = Settings()

backend/app/database.py

@@ -0,0 +1,55 @@
+"""Database configuration and session management"""
+from sqlalchemy import create_engine
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+from app.config import settings
+
+# Sync engine for migrations
+sync_engine = create_engine(
+    settings.DATABASE_URL,
+    pool_pre_ping=True,
+    echo=settings.DEBUG
+)
+
+# Async engine for application
+async_engine = create_async_engine(
+    settings.DATABASE_ASYNC_URL,
+    pool_pre_ping=True,
+    echo=settings.DEBUG,
+    future=True
+)
+
+# Session makers
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=sync_engine)
+AsyncSessionLocal = async_sessionmaker(
+    async_engine,
+    class_=AsyncSession,
+    expire_on_commit=False
+)
+
+# Base class for models
+Base = declarative_base()
+
+
+# Dependency for getting DB session
+async def get_db():
+    """Get async database session"""
+    async with AsyncSessionLocal() as session:
+        try:
+            yield session
+            await session.commit()
+        except Exception:
+            await session.rollback()
+            raise
+        finally:
+            await session.close()
+
+
+def get_sync_db():
+    """Get sync database session (for migrations)"""
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

backend/app/main.py

@@ -0,0 +1,141 @@
+"""Main FastAPI application"""
+from fastapi import FastAPI, Request
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.responses import JSONResponse
+from contextlib import asynccontextmanager
+import time
+
+from app.config import settings
+from app.database import async_engine, Base
+from app.redis_client import close_redis
+from app.routers import auth, email, social, video, files, blockchain, ai_chat
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    """Application lifespan events"""
+    # Startup
+    print("Starting BlackRoad Operating System Backend...")
+
+    # Create database tables
+    async with async_engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+
+    print("Database tables created successfully")
+    print(f"Server running on {settings.ENVIRONMENT} mode")
+
+    yield
+
+    # Shutdown
+    print("Shutting down...")
+    await close_redis()
+    await async_engine.dispose()
+    print("Shutdown complete")
+
+
+# Create FastAPI app
+app = FastAPI(
+    title=settings.APP_NAME,
+    version=settings.APP_VERSION,
+    description="Backend API for BlackRoad Operating System - A Windows 95-inspired web OS",
+    lifespan=lifespan,
+    docs_url="/api/docs",
+    redoc_url="/api/redoc",
+    openapi_url="/api/openapi.json"
+)
+
+# CORS middleware
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=settings.allowed_origins_list,
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+
+# Request timing middleware
+@app.middleware("http")
+async def add_process_time_header(request: Request, call_next):
+    """Add processing time header to responses"""
+    start_time = time.time()
+    response = await call_next(request)
+    process_time = time.time() - start_time
+    response.headers["X-Process-Time"] = str(process_time)
+    return response
+
+
+# Error handlers
+@app.exception_handler(404)
+async def not_found_handler(request: Request, exc):
+    """Handle 404 errors"""
+    return JSONResponse(
+        status_code=404,
+        content={"detail": "Resource not found"}
+    )
+
+
+@app.exception_handler(500)
+async def internal_error_handler(request: Request, exc):
+    """Handle 500 errors"""
+    return JSONResponse(
+        status_code=500,
+        content={"detail": "Internal server error"}
+    )
+
+
+# Include routers
+app.include_router(auth.router)
+app.include_router(email.router)
+app.include_router(social.router)
+app.include_router(video.router)
+app.include_router(files.router)
+app.include_router(blockchain.router)
+app.include_router(ai_chat.router)
+
+
+# Root endpoint
+@app.get("/")
+async def root():
+    """Root endpoint"""
+    return {
+        "name": settings.APP_NAME,
+        "version": settings.APP_VERSION,
+        "environment": settings.ENVIRONMENT,
+        "docs": "/api/docs",
+        "status": "operational"
+    }
+
+
+# Health check
+@app.get("/health")
+async def health_check():
+    """Health check endpoint"""
+    return {
+        "status": "healthy",
+        "timestamp": time.time()
+    }
+
+
+# API info
+@app.get("/api")
+async def api_info():
+    """API information"""
+    return {
+        "name": settings.APP_NAME,
+        "version": settings.APP_VERSION,
+        "endpoints": {
+            "auth": "/api/auth",
+            "email": "/api/email",
+            "social": "/api/social",
+            "videos": "/api/videos",
+            "files": "/api/files",
+            "blockchain": "/api/blockchain",
+            "ai_chat": "/api/ai-chat"
+        },
+        "documentation": {
+            "swagger": "/api/docs",
+            "redoc": "/api/redoc",
+            "openapi": "/api/openapi.json"
+        }
+    }

backend/app/models/__init__.py

@@ -0,0 +1,28 @@
+"""Database models"""
+from app.models.user import User
+from app.models.email import Email, EmailFolder
+from app.models.social import Post, Comment, Like, Follow
+from app.models.video import Video, VideoView, VideoLike
+from app.models.file import File, Folder
+from app.models.blockchain import Block, Transaction, Wallet
+from app.models.ai_chat import Conversation, Message
+
+__all__ = [
+    "User",
+    "Email",
+    "EmailFolder",
+    "Post",
+    "Comment",
+    "Like",
+    "Follow",
+    "Video",
+    "VideoView",
+    "VideoLike",
+    "File",
+    "Folder",
+    "Block",
+    "Transaction",
+    "Wallet",
+    "Conversation",
+    "Message",
+]

backend/app/models/ai_chat.py

@@ -0,0 +1,56 @@
+"""AI Chat models"""
+from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, Enum
+from sqlalchemy.sql import func
+import enum
+from app.database import Base
+
+
+class MessageRole(str, enum.Enum):
+    """Message role types"""
+    USER = "user"
+    ASSISTANT = "assistant"
+    SYSTEM = "system"
+
+
+class Conversation(Base):
+    """AI conversation model"""
+
+    __tablename__ = "conversations"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+
+    title = Column(String(255))
+    model = Column(String(100), default="gpt-3.5-turbo")
+
+    # Metadata
+    message_count = Column(Integer, default=0)
+    total_tokens = Column(Integer, default=0)
+
+    # Timestamps
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+
+class Message(Base):
+    """AI chat message model"""
+
+    __tablename__ = "messages"
+
+    id = Column(Integer, primary_key=True, index=True)
+    conversation_id = Column(Integer, ForeignKey("conversations.id", ondelete="CASCADE"), nullable=False)
+
+    role = Column(Enum(MessageRole), nullable=False)
+    content = Column(Text, nullable=False)
+
+    # Token usage
+    tokens = Column(Integer)
+
+    # Metadata
+    model = Column(String(100))
+    finish_reason = Column(String(50))
+
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    def __repr__(self):
+        return f"<Message {self.id} ({self.role})>"

backend/app/models/blockchain.py

@@ -0,0 +1,94 @@
+"""Blockchain and cryptocurrency models"""
+from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, Float, Boolean
+from sqlalchemy.sql import func
+from app.database import Base
+
+
+class Wallet(Base):
+    """Cryptocurrency wallet model"""
+
+    __tablename__ = "wallets"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+
+    address = Column(String(255), unique=True, nullable=False, index=True)
+    private_key = Column(String(500), nullable=False)  # Encrypted
+    public_key = Column(String(500), nullable=False)
+
+    balance = Column(Float, default=0.0)
+
+    # Metadata
+    label = Column(String(100))
+    is_primary = Column(Boolean, default=True)
+
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+
+class Transaction(Base):
+    """Blockchain transaction model"""
+
+    __tablename__ = "transactions"
+
+    id = Column(Integer, primary_key=True, index=True)
+
+    # Transaction details
+    transaction_hash = Column(String(255), unique=True, nullable=False, index=True)
+    from_address = Column(String(255), nullable=False, index=True)
+    to_address = Column(String(255), nullable=False, index=True)
+    amount = Column(Float, nullable=False)
+    fee = Column(Float, default=0.0)
+
+    # Block information
+    block_id = Column(Integer, ForeignKey("blocks.id", ondelete="SET NULL"))
+    block_index = Column(Integer)
+
+    # Status
+    is_confirmed = Column(Boolean, default=False)
+    confirmations = Column(Integer, default=0)
+
+    # Metadata
+    signature = Column(Text, nullable=False)
+    message = Column(Text)  # Optional transaction message
+
+    # Timestamps
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    confirmed_at = Column(DateTime(timezone=True))
+
+    def __repr__(self):
+        return f"<Transaction {self.transaction_hash}>"
+
+
+class Block(Base):
+    """Blockchain block model"""
+
+    __tablename__ = "blocks"
+
+    id = Column(Integer, primary_key=True, index=True)
+
+    # Block data
+    index = Column(Integer, unique=True, nullable=False, index=True)
+    timestamp = Column(DateTime(timezone=True), nullable=False)
+    nonce = Column(Integer, nullable=False)
+    previous_hash = Column(String(255), nullable=False)
+    hash = Column(String(255), unique=True, nullable=False, index=True)
+    merkle_root = Column(String(255))
+
+    # Mining
+    miner_id = Column(Integer, ForeignKey("users.id", ondelete="SET NULL"))
+    miner_address = Column(String(255))
+    difficulty = Column(Integer, nullable=False)
+    reward = Column(Float, default=0.0)
+
+    # Block metadata
+    transaction_count = Column(Integer, default=0)
+    size = Column(Integer)  # in bytes
+
+    # Validation
+    is_valid = Column(Boolean, default=True)
+
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+    def __repr__(self):
+        return f"<Block {self.index}>"

backend/app/models/email.py

@@ -0,0 +1,76 @@
+"""Email models"""
+from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, ForeignKey, Enum
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+import enum
+from app.database import Base
+
+
+class EmailFolderType(str, enum.Enum):
+    """Email folder types"""
+    INBOX = "inbox"
+    SENT = "sent"
+    DRAFTS = "drafts"
+    SPAM = "spam"
+    TRASH = "trash"
+    CUSTOM = "custom"
+
+
+class EmailFolder(Base):
+    """Email folder model"""
+
+    __tablename__ = "email_folders"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    name = Column(String(100), nullable=False)
+    folder_type = Column(Enum(EmailFolderType), default=EmailFolderType.CUSTOM)
+    icon = Column(String(50))
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+
+class Email(Base):
+    """Email model"""
+
+    __tablename__ = "emails"
+
+    id = Column(Integer, primary_key=True, index=True)
+
+    # Sender/Receiver
+    sender_id = Column(Integer, ForeignKey("users.id", ondelete="SET NULL"))
+    sender_email = Column(String(255), nullable=False)
+    sender_name = Column(String(255))
+
+    recipient_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    recipient_email = Column(String(255), nullable=False)
+
+    # CC/BCC
+    cc = Column(Text)  # Comma-separated emails
+    bcc = Column(Text)  # Comma-separated emails
+
+    # Email content
+    subject = Column(String(500), nullable=False)
+    body = Column(Text, nullable=False)
+    html_body = Column(Text)
+
+    # Metadata
+    folder_id = Column(Integer, ForeignKey("email_folders.id", ondelete="SET NULL"))
+    is_read = Column(Boolean, default=False)
+    is_starred = Column(Boolean, default=False)
+    is_draft = Column(Boolean, default=False)
+    is_spam = Column(Boolean, default=False)
+
+    # Attachments (stored as JSON array of file IDs)
+    attachment_ids = Column(Text)
+
+    # Thread
+    thread_id = Column(String(255), index=True)
+    in_reply_to = Column(Integer, ForeignKey("emails.id", ondelete="SET NULL"))
+
+    # Timestamps
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    sent_at = Column(DateTime(timezone=True))
+    read_at = Column(DateTime(timezone=True))
+
+    def __repr__(self):
+        return f"<Email {self.id}: {self.subject}>"

backend/app/models/file.py

@@ -0,0 +1,64 @@
+"""File system models"""
+from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, ForeignKey, BigInteger
+from sqlalchemy.sql import func
+from app.database import Base
+
+
+class Folder(Base):
+    """Folder model"""
+
+    __tablename__ = "folders"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+
+    name = Column(String(255), nullable=False)
+    parent_id = Column(Integer, ForeignKey("folders.id", ondelete="CASCADE"))
+    path = Column(String(1000), nullable=False)  # Full path for quick lookups
+
+    is_shared = Column(Boolean, default=False)
+    is_public = Column(Boolean, default=False)
+
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+
+class File(Base):
+    """File model"""
+
+    __tablename__ = "files"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    folder_id = Column(Integer, ForeignKey("folders.id", ondelete="CASCADE"))
+
+    name = Column(String(255), nullable=False)
+    original_name = Column(String(255), nullable=False)
+    path = Column(String(1000), nullable=False)
+
+    # File metadata
+    file_type = Column(String(100))  # MIME type
+    extension = Column(String(20))
+    size = Column(BigInteger, nullable=False)  # in bytes
+
+    # Storage
+    storage_key = Column(String(500), nullable=False)  # S3 key or local path
+    storage_url = Column(String(1000))  # Public URL if available
+    checksum = Column(String(64))  # SHA-256 hash
+
+    # Sharing
+    is_shared = Column(Boolean, default=False)
+    is_public = Column(Boolean, default=False)
+    share_token = Column(String(255), unique=True)
+
+    # Metadata
+    description = Column(Text)
+    tags = Column(Text)  # Comma-separated
+
+    # Timestamps
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+    last_accessed = Column(DateTime(timezone=True))
+
+    def __repr__(self):
+        return f"<File {self.name}>"

backend/app/models/social.py

@@ -0,0 +1,75 @@
+"""Social media models"""
+from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, ForeignKey
+from sqlalchemy.sql import func
+from app.database import Base
+
+
+class Post(Base):
+    """Social media post model"""
+
+    __tablename__ = "posts"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    content = Column(Text, nullable=False)
+    image_url = Column(String(500))
+    video_url = Column(String(500))
+
+    # Engagement metrics
+    likes_count = Column(Integer, default=0)
+    comments_count = Column(Integer, default=0)
+    shares_count = Column(Integer, default=0)
+    views_count = Column(Integer, default=0)
+
+    # Visibility
+    is_public = Column(Boolean, default=True)
+    is_pinned = Column(Boolean, default=False)
+
+    # Timestamps
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+    def __repr__(self):
+        return f"<Post {self.id}>"
+
+
+class Comment(Base):
+    """Comment model"""
+
+    __tablename__ = "comments"
+
+    id = Column(Integer, primary_key=True, index=True)
+    post_id = Column(Integer, ForeignKey("posts.id", ondelete="CASCADE"), nullable=False)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    content = Column(Text, nullable=False)
+    parent_id = Column(Integer, ForeignKey("comments.id", ondelete="CASCADE"))  # For nested comments
+
+    likes_count = Column(Integer, default=0)
+
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+
+class Like(Base):
+    """Like model"""
+
+    __tablename__ = "likes"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    post_id = Column(Integer, ForeignKey("posts.id", ondelete="CASCADE"))
+    comment_id = Column(Integer, ForeignKey("comments.id", ondelete="CASCADE"))
+
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+
+class Follow(Base):
+    """Follow relationship model"""
+
+    __tablename__ = "follows"
+
+    id = Column(Integer, primary_key=True, index=True)
+    follower_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    following_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+
+    created_at = Column(DateTime(timezone=True), server_default=func.now())

backend/app/models/user.py

@@ -0,0 +1,34 @@
+"""User model"""
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, Float
+from sqlalchemy.sql import func
+from app.database import Base
+
+
+class User(Base):
+    """User model"""
+
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    username = Column(String(50), unique=True, index=True, nullable=False)
+    email = Column(String(255), unique=True, index=True, nullable=False)
+    hashed_password = Column(String(255), nullable=False)
+    full_name = Column(String(255))
+    avatar_url = Column(String(500))
+    bio = Column(String(500))
+    is_active = Column(Boolean, default=True)
+    is_verified = Column(Boolean, default=False)
+    is_admin = Column(Boolean, default=False)
+
+    # Blockchain wallet
+    wallet_address = Column(String(255), unique=True, index=True)
+    wallet_private_key = Column(String(500))  # Encrypted
+    balance = Column(Float, default=0.0)
+
+    # Timestamps
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+    last_login = Column(DateTime(timezone=True))
+
+    def __repr__(self):
+        return f"<User {self.username}>"

backend/app/models/video.py

@@ -0,0 +1,78 @@
+"""Video streaming models"""
+from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, ForeignKey, Float
+from sqlalchemy.sql import func
+from app.database import Base
+
+
+class Video(Base):
+    """Video model"""
+
+    __tablename__ = "videos"
+
+    id = Column(Integer, primary_key=True, index=True)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+
+    title = Column(String(255), nullable=False)
+    description = Column(Text)
+    thumbnail_url = Column(String(500))
+    video_url = Column(String(500), nullable=False)
+
+    # Video metadata
+    duration = Column(Integer)  # in seconds
+    resolution = Column(String(20))  # e.g., "1920x1080"
+    file_size = Column(Integer)  # in bytes
+    format = Column(String(20))  # e.g., "mp4", "webm"
+
+    # Engagement
+    views_count = Column(Integer, default=0)
+    likes_count = Column(Integer, default=0)
+    dislikes_count = Column(Integer, default=0)
+    comments_count = Column(Integer, default=0)
+
+    # Visibility
+    is_public = Column(Boolean, default=True)
+    is_live = Column(Boolean, default=False)
+    is_processing = Column(Boolean, default=False)
+
+    # Categories/Tags
+    category = Column(String(100))
+    tags = Column(Text)  # Comma-separated
+
+    # Timestamps
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+    published_at = Column(DateTime(timezone=True))
+
+
+class VideoView(Base):
+    """Video view tracking"""
+
+    __tablename__ = "video_views"
+
+    id = Column(Integer, primary_key=True, index=True)
+    video_id = Column(Integer, ForeignKey("videos.id", ondelete="CASCADE"), nullable=False)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="SET NULL"))
+
+    # Watch metadata
+    watch_duration = Column(Integer)  # seconds watched
+    completion_percentage = Column(Float)
+
+    # Analytics
+    ip_address = Column(String(45))
+    user_agent = Column(String(500))
+    referrer = Column(String(500))
+
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+
+
+class VideoLike(Base):
+    """Video like/dislike tracking"""
+
+    __tablename__ = "video_likes"
+
+    id = Column(Integer, primary_key=True, index=True)
+    video_id = Column(Integer, ForeignKey("videos.id", ondelete="CASCADE"), nullable=False)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
+    is_like = Column(Boolean, default=True)  # True=like, False=dislike
+
+    created_at = Column(DateTime(timezone=True), server_default=func.now())

backend/app/redis_client.py

@@ -0,0 +1,31 @@
+"""Redis client configuration"""
+import redis.asyncio as redis
+from app.config import settings
+
+# Redis connection pool
+redis_pool = None
+
+
+async def get_redis_pool():
+    """Get Redis connection pool"""
+    global redis_pool
+    if redis_pool is None:
+        redis_pool = redis.ConnectionPool.from_url(
+            settings.REDIS_URL,
+            decode_responses=True
+        )
+    return redis_pool
+
+
+async def get_redis():
+    """Get Redis client"""
+    pool = await get_redis_pool()
+    return redis.Redis(connection_pool=pool)
+
+
+async def close_redis():
+    """Close Redis connection pool"""
+    global redis_pool
+    if redis_pool:
+        await redis_pool.disconnect()
+        redis_pool = None

backend/app/routers/__init__.py

@@ -0,0 +1 @@
+"""API routers"""

backend/app/routers/ai_chat.py

@@ -0,0 +1,234 @@
+"""AI Chat routes"""
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select, and_, desc, delete
+from typing import List, Optional
+from pydantic import BaseModel
+from datetime import datetime
+
+from app.database import get_db
+from app.models.user import User
+from app.models.ai_chat import Conversation, Message, MessageRole
+from app.auth import get_current_active_user
+
+router = APIRouter(prefix="/api/ai-chat", tags=["AI Chat"])
+
+
+class ConversationCreate(BaseModel):
+    title: Optional[str] = "New Conversation"
+
+
+class ConversationResponse(BaseModel):
+    id: int
+    title: Optional[str]
+    message_count: int
+    created_at: datetime
+    updated_at: Optional[datetime]
+
+    class Config:
+        from_attributes = True
+
+
+class MessageCreate(BaseModel):
+    content: str
+
+
+class MessageResponse(BaseModel):
+    id: int
+    role: MessageRole
+    content: str
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+@router.get("/conversations", response_model=List[ConversationResponse])
+async def get_conversations(
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db),
+    limit: int = 50,
+    offset: int = 0
+):
+    """Get user's conversations"""
+    result = await db.execute(
+        select(Conversation)
+        .where(Conversation.user_id == current_user.id)
+        .order_by(desc(Conversation.updated_at))
+        .limit(limit)
+        .offset(offset)
+    )
+    conversations = result.scalars().all()
+
+    return conversations
+
+
+@router.post("/conversations", response_model=ConversationResponse, status_code=status.HTTP_201_CREATED)
+async def create_conversation(
+    conv_data: ConversationCreate,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Create a new conversation"""
+    conversation = Conversation(
+        user_id=current_user.id,
+        title=conv_data.title
+    )
+
+    db.add(conversation)
+    await db.commit()
+    await db.refresh(conversation)
+
+    return conversation
+
+
+@router.get("/conversations/{conversation_id}", response_model=ConversationResponse)
+async def get_conversation(
+    conversation_id: int,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Get a conversation"""
+    result = await db.execute(
+        select(Conversation).where(
+            and_(
+                Conversation.id == conversation_id,
+                Conversation.user_id == current_user.id
+            )
+        )
+    )
+    conversation = result.scalar_one_or_none()
+
+    if not conversation:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Conversation not found"
+        )
+
+    return conversation
+
+
+@router.get("/conversations/{conversation_id}/messages", response_model=List[MessageResponse])
+async def get_messages(
+    conversation_id: int,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Get messages in a conversation"""
+    # Verify conversation belongs to user
+    result = await db.execute(
+        select(Conversation).where(
+            and_(
+                Conversation.id == conversation_id,
+                Conversation.user_id == current_user.id
+            )
+        )
+    )
+    conversation = result.scalar_one_or_none()
+
+    if not conversation:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Conversation not found"
+        )
+
+    # Get messages
+    result = await db.execute(
+        select(Message)
+        .where(Message.conversation_id == conversation_id)
+        .order_by(Message.created_at.asc())
+    )
+    messages = result.scalars().all()
+
+    return messages
+
+
+@router.post("/conversations/{conversation_id}/messages", response_model=MessageResponse)
+async def send_message(
+    conversation_id: int,
+    message_data: MessageCreate,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Send a message in a conversation"""
+    # Verify conversation belongs to user
+    result = await db.execute(
+        select(Conversation).where(
+            and_(
+                Conversation.id == conversation_id,
+                Conversation.user_id == current_user.id
+            )
+        )
+    )
+    conversation = result.scalar_one_or_none()
+
+    if not conversation:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Conversation not found"
+        )
+
+    # Create user message
+    user_message = Message(
+        conversation_id=conversation_id,
+        role=MessageRole.USER,
+        content=message_data.content
+    )
+    db.add(user_message)
+
+    # Generate AI response (simplified - in production, call OpenAI API)
+    ai_response_content = f"This is a simulated AI response to: '{message_data.content}'. In production, this would call the OpenAI API configured in settings.OPENAI_API_KEY."
+
+    ai_message = Message(
+        conversation_id=conversation_id,
+        role=MessageRole.ASSISTANT,
+        content=ai_response_content
+    )
+    db.add(ai_message)
+
+    # Update conversation
+    conversation.message_count += 2
+    conversation.updated_at = datetime.utcnow()
+
+    if not conversation.title or conversation.title == "New Conversation":
+        # Auto-generate title from first message
+        conversation.title = message_data.content[:50] + "..." if len(message_data.content) > 50 else message_data.content
+
+    await db.commit()
+    await db.refresh(ai_message)
+
+    return ai_message
+
+
+@router.delete("/conversations/{conversation_id}", status_code=status.HTTP_204_NO_CONTENT)
+async def delete_conversation(
+    conversation_id: int,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Delete a conversation"""
+    result = await db.execute(
+        select(Conversation).where(
+            and_(
+                Conversation.id == conversation_id,
+                Conversation.user_id == current_user.id
+            )
+        )
+    )
+    conversation = result.scalar_one_or_none()
+
+    if not conversation:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Conversation not found"
+        )
+
+    # Delete all messages
+    await db.execute(
+        delete(Message).where(Message.conversation_id == conversation_id)
+    )
+
+    await db.delete(conversation)
+    await db.commit()
+
+    return None

backend/app/routers/auth.py

@@ -0,0 +1,117 @@
+"""Authentication routes"""
+from fastapi import APIRouter, Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordRequestForm
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select
+
+from app.database import get_db
+from app.models.user import User
+from app.schemas.user import UserCreate, UserResponse, Token, UserLogin
+from app.auth import (
+    verify_password,
+    get_password_hash,
+    create_access_token,
+    create_refresh_token,
+    get_current_active_user
+)
+from app.services.blockchain import BlockchainService
+from datetime import datetime
+
+router = APIRouter(prefix="/api/auth", tags=["Authentication"])
+
+
+@router.post("/register", response_model=UserResponse, status_code=status.HTTP_201_CREATED)
+async def register(user_data: UserCreate, db: AsyncSession = Depends(get_db)):
+    """Register a new user"""
+    # Check if user exists
+    result = await db.execute(
+        select(User).where(
+            (User.username == user_data.username) | (User.email == user_data.email)
+        )
+    )
+    existing_user = result.scalar_one_or_none()
+
+    if existing_user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Username or email already registered"
+        )
+
+    # Generate wallet
+    wallet_address, private_key = BlockchainService.generate_wallet_address()
+
+    # Create user
+    user = User(
+        username=user_data.username,
+        email=user_data.email,
+        full_name=user_data.full_name,
+        hashed_password=get_password_hash(user_data.password),
+        wallet_address=wallet_address,
+        wallet_private_key=private_key,  # In production, encrypt this!
+        balance=100.0,  # Starting bonus
+        created_at=datetime.utcnow()
+    )
+
+    db.add(user)
+    await db.commit()
+    await db.refresh(user)
+
+    return user
+
+
+@router.post("/login", response_model=Token)
+async def login(
+    form_data: OAuth2PasswordRequestForm = Depends(),
+    db: AsyncSession = Depends(get_db)
+):
+    """Login and get access token"""
+    # Get user
+    result = await db.execute(
+        select(User).where(User.username == form_data.username)
+    )
+    user = result.scalar_one_or_none()
+
+    if not user or not verify_password(form_data.password, user.hashed_password):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect username or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+
+    if not user.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Inactive user"
+        )
+
+    # Update last login
+    user.last_login = datetime.utcnow()
+    await db.commit()
+
+    # Create tokens
+    access_token = create_access_token(
+        data={"user_id": user.id, "username": user.username}
+    )
+    refresh_token = create_refresh_token(
+        data={"user_id": user.id, "username": user.username}
+    )
+
+    return {
+        "access_token": access_token,
+        "refresh_token": refresh_token,
+        "token_type": "bearer"
+    }
+
+
+@router.get("/me", response_model=UserResponse)
+async def get_current_user_info(
+    current_user: User = Depends(get_current_active_user)
+):
+    """Get current user information"""
+    return current_user
+
+
+@router.post("/logout")
+async def logout():
+    """Logout (client should delete token)"""
+    return {"message": "Successfully logged out"}

backend/app/routers/blockchain.py

@@ -0,0 +1,273 @@
+"""Blockchain and cryptocurrency routes"""
+from fastapi import APIRouter, Depends, HTTPException, status, BackgroundTasks
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select, and_, or_, desc, func
+from typing import List, Optional
+from pydantic import BaseModel
+from datetime import datetime
+
+from app.database import get_db
+from app.models.user import User
+from app.models.blockchain import Block, Transaction, Wallet
+from app.auth import get_current_active_user
+from app.services.blockchain import BlockchainService
+
+router = APIRouter(prefix="/api/blockchain", tags=["Blockchain"])
+
+
+class TransactionCreate(BaseModel):
+    to_address: str
+    amount: float
+    message: Optional[str] = None
+
+
+class TransactionResponse(BaseModel):
+    id: int
+    transaction_hash: str
+    from_address: str
+    to_address: str
+    amount: float
+    fee: float
+    is_confirmed: bool
+    confirmations: int
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class BlockResponse(BaseModel):
+    id: int
+    index: int
+    timestamp: datetime
+    hash: str
+    previous_hash: str
+    nonce: int
+    miner_address: Optional[str]
+    difficulty: int
+    reward: float
+    transaction_count: int
+
+    class Config:
+        from_attributes = True
+
+
+class WalletResponse(BaseModel):
+    address: str
+    balance: float
+    label: Optional[str]
+
+    class Config:
+        from_attributes = True
+
+
+@router.get("/wallet", response_model=WalletResponse)
+async def get_wallet(
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Get user's wallet"""
+    return WalletResponse(
+        address=current_user.wallet_address,
+        balance=current_user.balance,
+        label="Primary Wallet"
+    )
+
+
+@router.get("/balance")
+async def get_balance(
+    current_user: User = Depends(get_current_active_user)
+):
+    """Get wallet balance"""
+    return {
+        "address": current_user.wallet_address,
+        "balance": current_user.balance
+    }
+
+
+@router.post("/transactions", response_model=TransactionResponse, status_code=status.HTTP_201_CREATED)
+async def create_transaction(
+    tx_data: TransactionCreate,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Create a new transaction"""
+    # Check balance
+    if current_user.balance < tx_data.amount:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Insufficient balance"
+        )
+
+    # Find recipient
+    result = await db.execute(
+        select(User).where(User.wallet_address == tx_data.to_address)
+    )
+    recipient = result.scalar_one_or_none()
+
+    if not recipient:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Recipient wallet not found"
+        )
+
+    # Create transaction
+    transaction = await BlockchainService.create_transaction(
+        db=db,
+        from_address=current_user.wallet_address,
+        to_address=tx_data.to_address,
+        amount=tx_data.amount,
+        private_key=current_user.wallet_private_key
+    )
+
+    # Update balances (simplified - in production would be done on block confirmation)
+    current_user.balance -= tx_data.amount
+    recipient.balance += tx_data.amount
+
+    await db.commit()
+    await db.refresh(transaction)
+
+    return transaction
+
+
+@router.get("/transactions", response_model=List[TransactionResponse])
+async def get_transactions(
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db),
+    limit: int = 50,
+    offset: int = 0
+):
+    """Get user's transactions"""
+    result = await db.execute(
+        select(Transaction)
+        .where(
+            or_(
+                Transaction.from_address == current_user.wallet_address,
+                Transaction.to_address == current_user.wallet_address
+            )
+        )
+        .order_by(desc(Transaction.created_at))
+        .limit(limit)
+        .offset(offset)
+    )
+    transactions = result.scalars().all()
+
+    return transactions
+
+
+@router.get("/transactions/{tx_hash}", response_model=TransactionResponse)
+async def get_transaction(
+    tx_hash: str,
+    db: AsyncSession = Depends(get_db)
+):
+    """Get transaction by hash"""
+    result = await db.execute(
+        select(Transaction).where(Transaction.transaction_hash == tx_hash)
+    )
+    transaction = result.scalar_one_or_none()
+
+    if not transaction:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Transaction not found"
+        )
+
+    return transaction
+
+
+@router.get("/blocks", response_model=List[BlockResponse])
+async def get_blocks(
+    db: AsyncSession = Depends(get_db),
+    limit: int = 20,
+    offset: int = 0
+):
+    """Get blockchain blocks"""
+    result = await db.execute(
+        select(Block)
+        .order_by(desc(Block.index))
+        .limit(limit)
+        .offset(offset)
+    )
+    blocks = result.scalars().all()
+
+    return blocks
+
+
+@router.get("/blocks/{block_id}", response_model=BlockResponse)
+async def get_block(
+    block_id: int,
+    db: AsyncSession = Depends(get_db)
+):
+    """Get block by ID or index"""
+    result = await db.execute(
+        select(Block).where(
+            or_(
+                Block.id == block_id,
+                Block.index == block_id
+            )
+        )
+    )
+    block = result.scalar_one_or_none()
+
+    if not block:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Block not found"
+        )
+
+    return block
+
+
+@router.post("/mine", response_model=BlockResponse)
+async def mine_block(
+    background_tasks: BackgroundTasks,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Mine a new block"""
+    # Get pending transactions
+    result = await db.execute(
+        select(Transaction)
+        .where(Transaction.is_confirmed == False)
+        .limit(10)
+    )
+    pending_transactions = list(result.scalars().all())
+
+    # Mine block
+    block = await BlockchainService.mine_block(
+        db=db,
+        user=current_user,
+        transactions=pending_transactions
+    )
+
+    return block
+
+
+@router.get("/stats")
+async def get_blockchain_stats(
+    db: AsyncSession = Depends(get_db)
+):
+    """Get blockchain statistics"""
+    # Get latest block
+    latest_block = await BlockchainService.get_latest_block(db)
+
+    # Get total transactions
+    result = await db.execute(select(func.count(Transaction.id)))
+    total_transactions = result.scalar() or 0
+
+    # Get pending transactions
+    result = await db.execute(
+        select(func.count(Transaction.id))
+        .where(Transaction.is_confirmed == False)
+    )
+    pending_transactions = result.scalar() or 0
+
+    return {
+        "latest_block_index": latest_block.index if latest_block else 0,
+        "latest_block_hash": latest_block.hash if latest_block else None,
+        "total_blocks": latest_block.index + 1 if latest_block else 0,
+        "total_transactions": total_transactions,
+        "pending_transactions": pending_transactions,
+        "difficulty": latest_block.difficulty if latest_block else 4,
+        "mining_reward": latest_block.reward if latest_block else 50.0
+    }

backend/app/routers/email.py

@@ -0,0 +1,231 @@
+"""Email (RoadMail) routes"""
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select, or_, and_, func
+from typing import List
+from pydantic import BaseModel, EmailStr
+from datetime import datetime
+
+from app.database import get_db
+from app.models.user import User
+from app.models.email import Email, EmailFolder, EmailFolderType
+from app.auth import get_current_active_user
+
+router = APIRouter(prefix="/api/email", tags=["Email"])
+
+
+class EmailCreate(BaseModel):
+    to: EmailStr
+    subject: str
+    body: str
+    cc: List[EmailStr] = []
+    bcc: List[EmailStr] = []
+
+
+class EmailResponse(BaseModel):
+    id: int
+    sender_email: str
+    sender_name: str
+    recipient_email: str
+    subject: str
+    body: str
+    is_read: bool
+    is_starred: bool
+    created_at: datetime
+    sent_at: datetime | None
+
+    class Config:
+        from_attributes = True
+
+
+@router.get("/folders", response_model=List[dict])
+async def get_folders(
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Get user's email folders"""
+    result = await db.execute(
+        select(EmailFolder).where(EmailFolder.user_id == current_user.id)
+    )
+    folders = result.scalars().all()
+
+    # Create default folders if none exist
+    if not folders:
+        default_folders = [
+            EmailFolder(user_id=current_user.id, name="Inbox", folder_type=EmailFolderType.INBOX, icon="📥"),
+            EmailFolder(user_id=current_user.id, name="Sent", folder_type=EmailFolderType.SENT, icon="📤"),
+            EmailFolder(user_id=current_user.id, name="Drafts", folder_type=EmailFolderType.DRAFTS, icon="📝"),
+            EmailFolder(user_id=current_user.id, name="Spam", folder_type=EmailFolderType.SPAM, icon="🚫"),
+            EmailFolder(user_id=current_user.id, name="Trash", folder_type=EmailFolderType.TRASH, icon="🗑️"),
+        ]
+        for folder in default_folders:
+            db.add(folder)
+        await db.commit()
+        folders = default_folders
+
+    return [
+        {
+            "id": f.id,
+            "name": f.name,
+            "icon": f.icon,
+            "folder_type": f.folder_type
+        }
+        for f in folders
+    ]
+
+
+@router.get("/inbox", response_model=List[EmailResponse])
+async def get_inbox(
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db),
+    limit: int = 50,
+    offset: int = 0
+):
+    """Get inbox emails"""
+    result = await db.execute(
+        select(Email)
+        .where(
+            and_(
+                Email.recipient_id == current_user.id,
+                Email.is_draft == False
+            )
+        )
+        .order_by(Email.created_at.desc())
+        .limit(limit)
+        .offset(offset)
+    )
+    emails = result.scalars().all()
+    return emails
+
+
+@router.get("/sent", response_model=List[EmailResponse])
+async def get_sent(
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db),
+    limit: int = 50,
+    offset: int = 0
+):
+    """Get sent emails"""
+    result = await db.execute(
+        select(Email)
+        .where(
+            and_(
+                Email.sender_id == current_user.id,
+                Email.is_draft == False
+            )
+        )
+        .order_by(Email.created_at.desc())
+        .limit(limit)
+        .offset(offset)
+    )
+    emails = result.scalars().all()
+    return emails
+
+
+@router.post("/send", response_model=EmailResponse, status_code=status.HTTP_201_CREATED)
+async def send_email(
+    email_data: EmailCreate,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Send an email"""
+    # Find recipient
+    result = await db.execute(
+        select(User).where(User.email == email_data.to)
+    )
+    recipient = result.scalar_one_or_none()
+
+    if not recipient:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Recipient not found"
+        )
+
+    # Create email
+    email = Email(
+        sender_id=current_user.id,
+        sender_email=current_user.email,
+        sender_name=current_user.full_name or current_user.username,
+        recipient_id=recipient.id,
+        recipient_email=recipient.email,
+        subject=email_data.subject,
+        body=email_data.body,
+        cc=",".join(email_data.cc) if email_data.cc else None,
+        bcc=",".join(email_data.bcc) if email_data.bcc else None,
+        is_read=False,
+        is_draft=False,
+        sent_at=datetime.utcnow()
+    )
+
+    db.add(email)
+    await db.commit()
+    await db.refresh(email)
+
+    return email
+
+
+@router.get("/{email_id}", response_model=EmailResponse)
+async def get_email(
+    email_id: int,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Get a specific email"""
+    result = await db.execute(
+        select(Email).where(
+            and_(
+                Email.id == email_id,
+                or_(
+                    Email.sender_id == current_user.id,
+                    Email.recipient_id == current_user.id
+                )
+            )
+        )
+    )
+    email = result.scalar_one_or_none()
+
+    if not email:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Email not found"
+        )
+
+    # Mark as read if recipient is viewing
+    if email.recipient_id == current_user.id and not email.is_read:
+        email.is_read = True
+        email.read_at = datetime.utcnow()
+        await db.commit()
+
+    return email
+
+
+@router.delete("/{email_id}", status_code=status.HTTP_204_NO_CONTENT)
+async def delete_email(
+    email_id: int,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Delete an email"""
+    result = await db.execute(
+        select(Email).where(
+            and_(
+                Email.id == email_id,
+                or_(
+                    Email.sender_id == current_user.id,
+                    Email.recipient_id == current_user.id
+                )
+            )
+        )
+    )
+    email = result.scalar_one_or_none()
+
+    if not email:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Email not found"
+        )
+
+    await db.delete(email)
+    await db.commit()
+
+    return None

backend/app/routers/files.py

@@ -0,0 +1,292 @@
+"""File storage (File Explorer) routes"""
+from fastapi import APIRouter, Depends, HTTPException, status, UploadFile, File as FastAPIFile
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select, and_, or_
+from typing import List, Optional
+from pydantic import BaseModel
+from datetime import datetime
+import secrets
+
+from app.database import get_db
+from app.models.user import User
+from app.models.file import File, Folder
+from app.auth import get_current_active_user
+
+router = APIRouter(prefix="/api/files", tags=["Files"])
+
+
+class FolderCreate(BaseModel):
+    name: str
+    parent_id: Optional[int] = None
+
+
+class FolderResponse(BaseModel):
+    id: int
+    name: str
+    parent_id: Optional[int]
+    path: str
+    is_shared: bool
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class FileResponse(BaseModel):
+    id: int
+    name: str
+    original_name: str
+    file_type: Optional[str]
+    extension: Optional[str]
+    size: int
+    storage_url: Optional[str]
+    is_shared: bool
+    is_public: bool
+    created_at: datetime
+    updated_at: Optional[datetime]
+
+    class Config:
+        from_attributes = True
+
+
+@router.get("/folders", response_model=List[FolderResponse])
+async def get_folders(
+    parent_id: Optional[int] = None,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Get folders"""
+    query = select(Folder).where(Folder.user_id == current_user.id)
+
+    if parent_id:
+        query = query.where(Folder.parent_id == parent_id)
+    else:
+        query = query.where(Folder.parent_id.is_(None))
+
+    result = await db.execute(query.order_by(Folder.name))
+    folders = result.scalars().all()
+
+    return folders
+
+
+@router.post("/folders", response_model=FolderResponse, status_code=status.HTTP_201_CREATED)
+async def create_folder(
+    folder_data: FolderCreate,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Create a folder"""
+    # Build path
+    path = f"/{folder_data.name}"
+    if folder_data.parent_id:
+        result = await db.execute(
+            select(Folder).where(
+                and_(
+                    Folder.id == folder_data.parent_id,
+                    Folder.user_id == current_user.id
+                )
+            )
+        )
+        parent = result.scalar_one_or_none()
+
+        if not parent:
+            raise HTTPException(
+                status_code=status.HTTP_404_NOT_FOUND,
+                detail="Parent folder not found"
+            )
+
+        path = f"{parent.path}/{folder_data.name}"
+
+    folder = Folder(
+        user_id=current_user.id,
+        name=folder_data.name,
+        parent_id=folder_data.parent_id,
+        path=path
+    )
+
+    db.add(folder)
+    await db.commit()
+    await db.refresh(folder)
+
+    return folder
+
+
+@router.get("/", response_model=List[FileResponse])
+async def get_files(
+    folder_id: Optional[int] = None,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db),
+    limit: int = 100,
+    offset: int = 0
+):
+    """Get files"""
+    query = select(File).where(File.user_id == current_user.id)
+
+    if folder_id:
+        query = query.where(File.folder_id == folder_id)
+    else:
+        query = query.where(File.folder_id.is_(None))
+
+    result = await db.execute(
+        query.order_by(File.name).limit(limit).offset(offset)
+    )
+    files = result.scalars().all()
+
+    return files
+
+
+@router.post("/upload", response_model=FileResponse, status_code=status.HTTP_201_CREATED)
+async def upload_file(
+    file: UploadFile = FastAPIFile(...),
+    folder_id: Optional[int] = None,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Upload a file"""
+    # Read file content
+    content = await file.read()
+    file_size = len(content)
+
+    # Generate unique filename
+    extension = file.filename.split('.')[-1] if '.' in file.filename else ''
+    unique_name = f"{secrets.token_hex(16)}.{extension}" if extension else secrets.token_hex(16)
+
+    # In production, upload to S3 here
+    storage_key = f"uploads/{current_user.id}/{unique_name}"
+    storage_url = f"https://storage.blackroad.com/{storage_key}"  # Placeholder
+
+    # Get folder path if specified
+    path = f"/{file.filename}"
+    if folder_id:
+        result = await db.execute(
+            select(Folder).where(
+                and_(
+                    Folder.id == folder_id,
+                    Folder.user_id == current_user.id
+                )
+            )
+        )
+        folder = result.scalar_one_or_none()
+        if folder:
+            path = f"{folder.path}/{file.filename}"
+
+    file_record = File(
+        user_id=current_user.id,
+        folder_id=folder_id,
+        name=unique_name,
+        original_name=file.filename,
+        path=path,
+        file_type=file.content_type,
+        extension=extension,
+        size=file_size,
+        storage_key=storage_key,
+        storage_url=storage_url
+    )
+
+    db.add(file_record)
+    await db.commit()
+    await db.refresh(file_record)
+
+    return file_record
+
+
+@router.get("/{file_id}", response_model=FileResponse)
+async def get_file(
+    file_id: int,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Get a file"""
+    result = await db.execute(
+        select(File).where(
+            and_(
+                File.id == file_id,
+                or_(
+                    File.user_id == current_user.id,
+                    File.is_public == True
+                )
+            )
+        )
+    )
+    file = result.scalar_one_or_none()
+
+    if not file:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="File not found"
+        )
+
+    # Update last accessed
+    file.last_accessed = datetime.utcnow()
+    await db.commit()
+
+    return file
+
+
+@router.delete("/{file_id}", status_code=status.HTTP_204_NO_CONTENT)
+async def delete_file(
+    file_id: int,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Delete a file"""
+    result = await db.execute(
+        select(File).where(
+            and_(
+                File.id == file_id,
+                File.user_id == current_user.id
+            )
+        )
+    )
+    file = result.scalar_one_or_none()
+
+    if not file:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="File not found"
+        )
+
+    # In production, delete from S3 here
+
+    await db.delete(file)
+    await db.commit()
+
+    return None
+
+
+@router.post("/{file_id}/share")
+async def share_file(
+    file_id: int,
+    is_public: bool = False,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Share a file"""
+    result = await db.execute(
+        select(File).where(
+            and_(
+                File.id == file_id,
+                File.user_id == current_user.id
+            )
+        )
+    )
+    file = result.scalar_one_or_none()
+
+    if not file:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="File not found"
+        )
+
+    file.is_shared = True
+    file.is_public = is_public
+
+    if not file.share_token:
+        file.share_token = secrets.token_urlsafe(32)
+
+    await db.commit()
+
+    return {
+        "share_token": file.share_token,
+        "share_url": f"https://blackroad.com/files/shared/{file.share_token}"
+    }

backend/app/routers/social.py

@@ -0,0 +1,307 @@
+"""Social media (BlackRoad Social) routes"""
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select, and_, or_, desc, func
+from typing import List, Optional
+from pydantic import BaseModel
+from datetime import datetime
+
+from app.database import get_db
+from app.models.user import User
+from app.models.social import Post, Comment, Like, Follow
+from app.auth import get_current_active_user
+
+router = APIRouter(prefix="/api/social", tags=["Social"])
+
+
+class PostCreate(BaseModel):
+    content: str
+    image_url: Optional[str] = None
+    video_url: Optional[str] = None
+
+
+class PostResponse(BaseModel):
+    id: int
+    user_id: int
+    username: str
+    avatar_url: Optional[str]
+    content: str
+    image_url: Optional[str]
+    video_url: Optional[str]
+    likes_count: int
+    comments_count: int
+    shares_count: int
+    created_at: datetime
+    is_liked: bool = False
+
+    class Config:
+        from_attributes = True
+
+
+class CommentCreate(BaseModel):
+    content: str
+    parent_id: Optional[int] = None
+
+
+class CommentResponse(BaseModel):
+    id: int
+    user_id: int
+    username: str
+    avatar_url: Optional[str]
+    content: str
+    likes_count: int
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+@router.get("/feed", response_model=List[PostResponse])
+async def get_feed(
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db),
+    limit: int = 20,
+    offset: int = 0
+):
+    """Get social media feed"""
+    # Get posts from followed users + own posts
+    result = await db.execute(
+        select(Post, User)
+        .join(User, Post.user_id == User.id)
+        .where(Post.is_public == True)
+        .order_by(desc(Post.created_at))
+        .limit(limit)
+        .offset(offset)
+    )
+    posts_with_users = result.all()
+
+    # Check which posts current user has liked
+    post_ids = [post.id for post, _ in posts_with_users]
+    liked_result = await db.execute(
+        select(Like.post_id)
+        .where(
+            and_(
+                Like.user_id == current_user.id,
+                Like.post_id.in_(post_ids)
+            )
+        )
+    )
+    liked_post_ids = {row[0] for row in liked_result.all()}
+
+    # Build response
+    feed = []
+    for post, user in posts_with_users:
+        feed.append(PostResponse(
+            id=post.id,
+            user_id=post.user_id,
+            username=user.username,
+            avatar_url=user.avatar_url,
+            content=post.content,
+            image_url=post.image_url,
+            video_url=post.video_url,
+            likes_count=post.likes_count,
+            comments_count=post.comments_count,
+            shares_count=post.shares_count,
+            created_at=post.created_at,
+            is_liked=post.id in liked_post_ids
+        ))
+
+    return feed
+
+
+@router.post("/posts", response_model=PostResponse, status_code=status.HTTP_201_CREATED)
+async def create_post(
+    post_data: PostCreate,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Create a new post"""
+    post = Post(
+        user_id=current_user.id,
+        content=post_data.content,
+        image_url=post_data.image_url,
+        video_url=post_data.video_url,
+        is_public=True
+    )
+
+    db.add(post)
+    await db.commit()
+    await db.refresh(post)
+
+    return PostResponse(
+        id=post.id,
+        user_id=post.user_id,
+        username=current_user.username,
+        avatar_url=current_user.avatar_url,
+        content=post.content,
+        image_url=post.image_url,
+        video_url=post.video_url,
+        likes_count=0,
+        comments_count=0,
+        shares_count=0,
+        created_at=post.created_at,
+        is_liked=False
+    )
+
+
+@router.post("/posts/{post_id}/like")
+async def like_post(
+    post_id: int,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Like a post"""
+    # Check if post exists
+    result = await db.execute(select(Post).where(Post.id == post_id))
+    post = result.scalar_one_or_none()
+
+    if not post:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Post not found"
+        )
+
+    # Check if already liked
+    result = await db.execute(
+        select(Like).where(
+            and_(
+                Like.user_id == current_user.id,
+                Like.post_id == post_id
+            )
+        )
+    )
+    existing_like = result.scalar_one_or_none()
+
+    if existing_like:
+        # Unlike
+        await db.delete(existing_like)
+        post.likes_count = max(0, post.likes_count - 1)
+        await db.commit()
+        return {"liked": False, "likes_count": post.likes_count}
+    else:
+        # Like
+        like = Like(user_id=current_user.id, post_id=post_id)
+        db.add(like)
+        post.likes_count += 1
+        await db.commit()
+        return {"liked": True, "likes_count": post.likes_count}
+
+
+@router.get("/posts/{post_id}/comments", response_model=List[CommentResponse])
+async def get_comments(
+    post_id: int,
+    db: AsyncSession = Depends(get_db),
+    limit: int = 50,
+    offset: int = 0
+):
+    """Get comments for a post"""
+    result = await db.execute(
+        select(Comment, User)
+        .join(User, Comment.user_id == User.id)
+        .where(Comment.post_id == post_id)
+        .order_by(Comment.created_at.asc())
+        .limit(limit)
+        .offset(offset)
+    )
+    comments_with_users = result.all()
+
+    return [
+        CommentResponse(
+            id=comment.id,
+            user_id=comment.user_id,
+            username=user.username,
+            avatar_url=user.avatar_url,
+            content=comment.content,
+            likes_count=comment.likes_count,
+            created_at=comment.created_at
+        )
+        for comment, user in comments_with_users
+    ]
+
+
+@router.post("/posts/{post_id}/comments", response_model=CommentResponse)
+async def create_comment(
+    post_id: int,
+    comment_data: CommentCreate,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Add a comment to a post"""
+    # Check if post exists
+    result = await db.execute(select(Post).where(Post.id == post_id))
+    post = result.scalar_one_or_none()
+
+    if not post:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Post not found"
+        )
+
+    comment = Comment(
+        post_id=post_id,
+        user_id=current_user.id,
+        content=comment_data.content,
+        parent_id=comment_data.parent_id
+    )
+
+    db.add(comment)
+    post.comments_count += 1
+    await db.commit()
+    await db.refresh(comment)
+
+    return CommentResponse(
+        id=comment.id,
+        user_id=comment.user_id,
+        username=current_user.username,
+        avatar_url=current_user.avatar_url,
+        content=comment.content,
+        likes_count=0,
+        created_at=comment.created_at
+    )
+
+
+@router.post("/users/{user_id}/follow")
+async def follow_user(
+    user_id: int,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Follow a user"""
+    if user_id == current_user.id:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Cannot follow yourself"
+        )
+
+    # Check if user exists
+    result = await db.execute(select(User).where(User.id == user_id))
+    user = result.scalar_one_or_none()
+
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="User not found"
+        )
+
+    # Check if already following
+    result = await db.execute(
+        select(Follow).where(
+            and_(
+                Follow.follower_id == current_user.id,
+                Follow.following_id == user_id
+            )
+        )
+    )
+    existing_follow = result.scalar_one_or_none()
+
+    if existing_follow:
+        # Unfollow
+        await db.delete(existing_follow)
+        await db.commit()
+        return {"following": False}
+    else:
+        # Follow
+        follow = Follow(follower_id=current_user.id, following_id=user_id)
+        db.add(follow)
+        await db.commit()
+        return {"following": True}

backend/app/routers/video.py

@@ -0,0 +1,277 @@
+"""Video streaming (BlackStream) routes"""
+from fastapi import APIRouter, Depends, HTTPException, status, UploadFile, File as FastAPIFile
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select, and_, desc
+from typing import List, Optional
+from pydantic import BaseModel
+from datetime import datetime
+
+from app.database import get_db
+from app.models.user import User
+from app.models.video import Video, VideoView, VideoLike
+from app.auth import get_current_active_user
+
+router = APIRouter(prefix="/api/videos", tags=["Videos"])
+
+
+class VideoCreate(BaseModel):
+    title: str
+    description: Optional[str] = None
+    video_url: str
+    thumbnail_url: Optional[str] = None
+    category: Optional[str] = None
+    tags: Optional[str] = None
+
+
+class VideoResponse(BaseModel):
+    id: int
+    user_id: int
+    username: str
+    avatar_url: Optional[str]
+    title: str
+    description: Optional[str]
+    thumbnail_url: Optional[str]
+    video_url: str
+    duration: Optional[int]
+    views_count: int
+    likes_count: int
+    dislikes_count: int
+    comments_count: int
+    is_public: bool
+    created_at: datetime
+    is_liked: Optional[bool] = None
+
+    class Config:
+        from_attributes = True
+
+
+@router.get("/", response_model=List[VideoResponse])
+async def get_videos(
+    db: AsyncSession = Depends(get_db),
+    category: Optional[str] = None,
+    limit: int = 20,
+    offset: int = 0,
+    current_user: User = Depends(get_current_active_user)
+):
+    """Get videos"""
+    query = select(Video, User).join(User, Video.user_id == User.id).where(Video.is_public == True)
+
+    if category:
+        query = query.where(Video.category == category)
+
+    query = query.order_by(desc(Video.created_at)).limit(limit).offset(offset)
+
+    result = await db.execute(query)
+    videos_with_users = result.all()
+
+    # Check which videos current user has liked
+    video_ids = [video.id for video, _ in videos_with_users]
+    liked_result = await db.execute(
+        select(VideoLike)
+        .where(
+            and_(
+                VideoLike.user_id == current_user.id,
+                VideoLike.video_id.in_(video_ids),
+                VideoLike.is_like == True
+            )
+        )
+    )
+    liked_video_ids = {like.video_id for like in liked_result.scalars().all()}
+
+    return [
+        VideoResponse(
+            id=video.id,
+            user_id=video.user_id,
+            username=user.username,
+            avatar_url=user.avatar_url,
+            title=video.title,
+            description=video.description,
+            thumbnail_url=video.thumbnail_url,
+            video_url=video.video_url,
+            duration=video.duration,
+            views_count=video.views_count,
+            likes_count=video.likes_count,
+            dislikes_count=video.dislikes_count,
+            comments_count=video.comments_count,
+            is_public=video.is_public,
+            created_at=video.created_at,
+            is_liked=video.id in liked_video_ids
+        )
+        for video, user in videos_with_users
+    ]
+
+
+@router.post("/", response_model=VideoResponse, status_code=status.HTTP_201_CREATED)
+async def upload_video(
+    video_data: VideoCreate,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Upload a video"""
+    video = Video(
+        user_id=current_user.id,
+        title=video_data.title,
+        description=video_data.description,
+        video_url=video_data.video_url,
+        thumbnail_url=video_data.thumbnail_url,
+        category=video_data.category,
+        tags=video_data.tags,
+        is_public=True,
+        published_at=datetime.utcnow()
+    )
+
+    db.add(video)
+    await db.commit()
+    await db.refresh(video)
+
+    return VideoResponse(
+        id=video.id,
+        user_id=video.user_id,
+        username=current_user.username,
+        avatar_url=current_user.avatar_url,
+        title=video.title,
+        description=video.description,
+        thumbnail_url=video.thumbnail_url,
+        video_url=video.video_url,
+        duration=video.duration,
+        views_count=0,
+        likes_count=0,
+        dislikes_count=0,
+        comments_count=0,
+        is_public=True,
+        created_at=video.created_at,
+        is_liked=False
+    )
+
+
+@router.get("/{video_id}", response_model=VideoResponse)
+async def get_video(
+    video_id: int,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(get_current_active_user)
+):
+    """Get a specific video"""
+    result = await db.execute(
+        select(Video, User)
+        .join(User, Video.user_id == User.id)
+        .where(Video.id == video_id)
+    )
+    video_with_user = result.first()
+
+    if not video_with_user:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Video not found"
+        )
+
+    video, user = video_with_user
+
+    # Record view
+    view = VideoView(
+        video_id=video.id,
+        user_id=current_user.id
+    )
+    db.add(view)
+    video.views_count += 1
+    await db.commit()
+
+    # Check if liked
+    liked_result = await db.execute(
+        select(VideoLike)
+        .where(
+            and_(
+                VideoLike.user_id == current_user.id,
+                VideoLike.video_id == video_id,
+                VideoLike.is_like == True
+            )
+        )
+    )
+    is_liked = liked_result.scalar_one_or_none() is not None
+
+    return VideoResponse(
+        id=video.id,
+        user_id=video.user_id,
+        username=user.username,
+        avatar_url=user.avatar_url,
+        title=video.title,
+        description=video.description,
+        thumbnail_url=video.thumbnail_url,
+        video_url=video.video_url,
+        duration=video.duration,
+        views_count=video.views_count,
+        likes_count=video.likes_count,
+        dislikes_count=video.dislikes_count,
+        comments_count=video.comments_count,
+        is_public=video.is_public,
+        created_at=video.created_at,
+        is_liked=is_liked
+    )
+
+
+@router.post("/{video_id}/like")
+async def like_video(
+    video_id: int,
+    is_like: bool = True,
+    current_user: User = Depends(get_current_active_user),
+    db: AsyncSession = Depends(get_db)
+):
+    """Like or dislike a video"""
+    # Check if video exists
+    result = await db.execute(select(Video).where(Video.id == video_id))
+    video = result.scalar_one_or_none()
+
+    if not video:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Video not found"
+        )
+
+    # Check if already liked/disliked
+    result = await db.execute(
+        select(VideoLike).where(
+            and_(
+                VideoLike.user_id == current_user.id,
+                VideoLike.video_id == video_id
+            )
+        )
+    )
+    existing_like = result.scalar_one_or_none()
+
+    if existing_like:
+        # Update or remove
+        if existing_like.is_like == is_like:
+            # Remove like/dislike
+            await db.delete(existing_like)
+            if is_like:
+                video.likes_count = max(0, video.likes_count - 1)
+            else:
+                video.dislikes_count = max(0, video.dislikes_count - 1)
+        else:
+            # Change from like to dislike or vice versa
+            existing_like.is_like = is_like
+            if is_like:
+                video.likes_count += 1
+                video.dislikes_count = max(0, video.dislikes_count - 1)
+            else:
+                video.dislikes_count += 1
+                video.likes_count = max(0, video.likes_count - 1)
+    else:
+        # New like/dislike
+        like = VideoLike(
+            user_id=current_user.id,
+            video_id=video_id,
+            is_like=is_like
+        )
+        db.add(like)
+        if is_like:
+            video.likes_count += 1
+        else:
+            video.dislikes_count += 1
+
+    await db.commit()
+
+    return {
+        "liked": is_like if existing_like is None or existing_like.is_like != is_like else None,
+        "likes_count": video.likes_count,
+        "dislikes_count": video.dislikes_count
+    }

backend/app/schemas/__init__.py

@@ -0,0 +1 @@
+"""Pydantic schemas for request/response validation"""

backend/app/schemas/user.py

@@ -0,0 +1,57 @@
+"""User schemas"""
+from pydantic import BaseModel, EmailStr, Field
+from typing import Optional
+from datetime import datetime
+
+
+class UserBase(BaseModel):
+    """Base user schema"""
+    username: str = Field(..., min_length=3, max_length=50)
+    email: EmailStr
+    full_name: Optional[str] = None
+
+
+class UserCreate(UserBase):
+    """User creation schema"""
+    password: str = Field(..., min_length=8)
+
+
+class UserLogin(BaseModel):
+    """User login schema"""
+    username: str
+    password: str
+
+
+class UserUpdate(BaseModel):
+    """User update schema"""
+    full_name: Optional[str] = None
+    bio: Optional[str] = None
+    avatar_url: Optional[str] = None
+
+
+class UserResponse(UserBase):
+    """User response schema"""
+    id: int
+    avatar_url: Optional[str] = None
+    bio: Optional[str] = None
+    is_active: bool
+    is_verified: bool
+    wallet_address: Optional[str] = None
+    balance: float
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class Token(BaseModel):
+    """JWT token response"""
+    access_token: str
+    refresh_token: str
+    token_type: str = "bearer"
+
+
+class TokenData(BaseModel):
+    """Token payload data"""
+    user_id: Optional[int] = None
+    username: Optional[str] = None

backend/app/services/__init__.py

@@ -0,0 +1 @@
+"""Business logic services"""

backend/app/services/blockchain.py

@@ -0,0 +1,167 @@
+"""Blockchain service"""
+import hashlib
+import json
+from datetime import datetime
+from typing import List, Optional
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy import select, desc
+from app.models.blockchain import Block, Transaction, Wallet
+from app.models.user import User
+from app.config import settings
+import secrets
+
+
+class BlockchainService:
+    """Blockchain service for RoadCoin"""
+
+    @staticmethod
+    def calculate_hash(index: int, timestamp: str, previous_hash: str,
+                      transactions: List[dict], nonce: int) -> str:
+        """Calculate block hash"""
+        data = f"{index}{timestamp}{previous_hash}{json.dumps(transactions)}{nonce}"
+        return hashlib.sha256(data.encode()).hexdigest()
+
+    @staticmethod
+    async def create_genesis_block(db: AsyncSession) -> Block:
+        """Create the genesis block"""
+        result = await db.execute(select(Block).where(Block.index == 0))
+        existing = result.scalar_one_or_none()
+
+        if existing:
+            return existing
+
+        timestamp = datetime.utcnow()
+        genesis_hash = BlockchainService.calculate_hash(0, str(timestamp), "0", [], 0)
+
+        genesis_block = Block(
+            index=0,
+            timestamp=timestamp,
+            nonce=0,
+            previous_hash="0",
+            hash=genesis_hash,
+            difficulty=settings.BLOCKCHAIN_DIFFICULTY,
+            reward=0,
+            transaction_count=0,
+            is_valid=True
+        )
+
+        db.add(genesis_block)
+        await db.commit()
+        await db.refresh(genesis_block)
+
+        return genesis_block
+
+    @staticmethod
+    async def get_latest_block(db: AsyncSession) -> Optional[Block]:
+        """Get the latest block in the chain"""
+        result = await db.execute(
+            select(Block).order_by(desc(Block.index)).limit(1)
+        )
+        return result.scalar_one_or_none()
+
+    @staticmethod
+    async def mine_block(db: AsyncSession, user: User, transactions: List[Transaction]) -> Block:
+        """Mine a new block"""
+        latest_block = await BlockchainService.get_latest_block(db)
+
+        if not latest_block:
+            latest_block = await BlockchainService.create_genesis_block(db)
+
+        new_index = latest_block.index + 1
+        timestamp = datetime.utcnow()
+        previous_hash = latest_block.hash
+        difficulty = settings.BLOCKCHAIN_DIFFICULTY
+
+        # Convert transactions to dict for hashing
+        tx_data = [
+            {
+                "from": tx.from_address,
+                "to": tx.to_address,
+                "amount": tx.amount
+            }
+            for tx in transactions
+        ]
+
+        # Mining (proof of work)
+        nonce = 0
+        block_hash = ""
+        target = "0" * difficulty
+
+        while not block_hash.startswith(target):
+            nonce += 1
+            block_hash = BlockchainService.calculate_hash(
+                new_index, str(timestamp), previous_hash, tx_data, nonce
+            )
+
+        # Create new block
+        new_block = Block(
+            index=new_index,
+            timestamp=timestamp,
+            nonce=nonce,
+            previous_hash=previous_hash,
+            hash=block_hash,
+            miner_id=user.id,
+            miner_address=user.wallet_address,
+            difficulty=difficulty,
+            reward=settings.MINING_REWARD,
+            transaction_count=len(transactions),
+            is_valid=True
+        )
+
+        db.add(new_block)
+
+        # Update transaction confirmations
+        for tx in transactions:
+            tx.block_id = new_block.id
+            tx.block_index = new_block.index
+            tx.is_confirmed = True
+            tx.confirmations = 1
+            tx.confirmed_at = datetime.utcnow()
+
+        # Reward miner
+        user.balance += settings.MINING_REWARD
+
+        await db.commit()
+        await db.refresh(new_block)
+
+        return new_block
+
+    @staticmethod
+    def generate_wallet_address() -> tuple[str, str]:
+        """Generate a new wallet address and private key"""
+        private_key = secrets.token_hex(32)
+        public_key = hashlib.sha256(private_key.encode()).hexdigest()
+        address = "RD" + hashlib.sha256(public_key.encode()).hexdigest()[:38]
+        return address, private_key
+
+    @staticmethod
+    async def create_transaction(
+        db: AsyncSession,
+        from_address: str,
+        to_address: str,
+        amount: float,
+        private_key: str
+    ) -> Transaction:
+        """Create a new transaction"""
+        # Generate transaction hash
+        tx_data = f"{from_address}{to_address}{amount}{datetime.utcnow()}"
+        transaction_hash = hashlib.sha256(tx_data.encode()).hexdigest()
+
+        # Sign transaction (simplified)
+        signature = hashlib.sha256(f"{transaction_hash}{private_key}".encode()).hexdigest()
+
+        transaction = Transaction(
+            transaction_hash=transaction_hash,
+            from_address=from_address,
+            to_address=to_address,
+            amount=amount,
+            signature=signature,
+            is_confirmed=False,
+            confirmations=0
+        )
+
+        db.add(transaction)
+        await db.commit()
+        await db.refresh(transaction)
+
+        return transaction

backend/docker-compose.yml

@@ -0,0 +1,69 @@
+version: '3.8'
+
+services:
+  # PostgreSQL Database
+  postgres:
+    image: postgres:15-alpine
+    container_name: blackroad_postgres
+    environment:
+      POSTGRES_USER: blackroad
+      POSTGRES_PASSWORD: password
+      POSTGRES_DB: blackroad_db
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U blackroad"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  # Redis Cache
+  redis:
+    image: redis:7-alpine
+    container_name: blackroad_redis
+    ports:
+      - "6379:6379"
+    volumes:
+      - redis_data:/data
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 10s
+      timeout: 3s
+      retries: 5
+
+  # FastAPI Backend
+  backend:
+    build: .
+    container_name: blackroad_backend
+    environment:
+      DATABASE_URL: postgresql://blackroad:password@postgres:5432/blackroad_db
+      DATABASE_ASYNC_URL: postgresql+asyncpg://blackroad:password@postgres:5432/blackroad_db
+      REDIS_URL: redis://redis:6379/0
+      SECRET_KEY: ${SECRET_KEY:-your-secret-key-change-this}
+      ENVIRONMENT: ${ENVIRONMENT:-development}
+      DEBUG: ${DEBUG:-True}
+    ports:
+      - "8000:8000"
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    volumes:
+      - ./app:/app/app
+    command: uvicorn app.main:app --host 0.0.0.0 --port 8000 --reload
+
+  # Adminer (Database Admin UI)
+  adminer:
+    image: adminer:latest
+    container_name: blackroad_adminer
+    ports:
+      - "8080:8080"
+    depends_on:
+      - postgres
+
+volumes:
+  postgres_data:
+  redis_data:

backend/requirements.txt

@@ -0,0 +1,58 @@
+# FastAPI and Server
+fastapi==0.104.1
+uvicorn[standard]==0.24.0
+python-multipart==0.0.6
+
+# Database
+sqlalchemy==2.0.23
+alembic==1.12.1
+psycopg2-binary==2.9.9
+asyncpg==0.29.0
+
+# Authentication & Security
+python-jose[cryptography]==3.3.0
+passlib[bcrypt]==1.7.4
+bcrypt==4.1.1
+pyjwt==2.8.0
+
+# Redis Cache
+redis==5.0.1
+hiredis==2.2.3
+
+# AWS S3 for File Storage
+boto3==1.29.7
+botocore==1.32.7
+
+# Email
+python-email-validator==2.1.0
+emails==0.6.0
+jinja2==3.1.2
+
+# WebSockets
+websockets==12.0
+
+# Utilities
+python-dotenv==1.0.0
+pydantic==2.5.0
+pydantic-settings==2.1.0
+
+# HTTP Client
+httpx==0.25.2
+aiohttp==3.9.1
+
+# Crypto/Blockchain
+cryptography==41.0.7
+ecdsa==0.18.0
+hashlib-additional==1.0.0
+
+# Testing
+pytest==7.4.3
+pytest-asyncio==0.21.1
+pytest-cov==4.1.0
+httpx==0.25.2
+
+# Monitoring
+prometheus-client==0.19.0
+
+# CORS
+python-cors==1.0.0

backend/run.py

@@ -0,0 +1,11 @@
+"""Run the application"""
+import uvicorn
+
+if __name__ == "__main__":
+    uvicorn.run(
+        "app.main:app",
+        host="0.0.0.0",
+        port=8000,
+        reload=True,
+        log_level="info"
+    )

backend/tests/__init__.py

@@ -0,0 +1 @@
+"""Tests for BlackRoad OS Backend"""

backend/tests/conftest.py

@@ -0,0 +1,85 @@
+"""Pytest configuration and fixtures"""
+import pytest
+import asyncio
+from typing import AsyncGenerator
+from httpx import AsyncClient
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession, async_sessionmaker
+
+from app.main import app
+from app.database import get_db, Base
+from app.config import settings
+
+# Test database URL
+TEST_DATABASE_URL = "postgresql+asyncpg://blackroad:password@localhost:5432/blackroad_test"
+
+# Create test engine
+test_engine = create_async_engine(TEST_DATABASE_URL, echo=False)
+TestSessionLocal = async_sessionmaker(test_engine, class_=AsyncSession, expire_on_commit=False)
+
+
+@pytest.fixture(scope="session")
+def event_loop():
+    """Create event loop for tests"""
+    loop = asyncio.get_event_loop_policy().new_event_loop()
+    yield loop
+    loop.close()
+
+
+@pytest.fixture(scope="function")
+async def db_session() -> AsyncGenerator[AsyncSession, None]:
+    """Create test database session"""
+    async with test_engine.begin() as conn:
+        await conn.run_sync(Base.metadata.create_all)
+
+    async with TestSessionLocal() as session:
+        yield session
+
+    async with test_engine.begin() as conn:
+        await conn.run_sync(Base.metadata.drop_all)
+
+
+@pytest.fixture(scope="function")
+async def client(db_session: AsyncSession) -> AsyncGenerator[AsyncClient, None]:
+    """Create test client"""
+    async def override_get_db():
+        yield db_session
+
+    app.dependency_overrides[get_db] = override_get_db
+
+    async with AsyncClient(app=app, base_url="http://test") as client:
+        yield client
+
+    app.dependency_overrides.clear()
+
+
+@pytest.fixture
+async def test_user(client: AsyncClient):
+    """Create a test user"""
+    user_data = {
+        "username": "testuser",
+        "email": "test@example.com",
+        "password": "testpassword123",
+        "full_name": "Test User"
+    }
+
+    response = await client.post("/api/auth/register", json=user_data)
+    assert response.status_code == 201
+    return response.json()
+
+
+@pytest.fixture
+async def auth_headers(client: AsyncClient, test_user):
+    """Get authentication headers"""
+    login_data = {
+        "username": "testuser",
+        "password": "testpassword123"
+    }
+
+    response = await client.post(
+        "/api/auth/login",
+        data=login_data
+    )
+    assert response.status_code == 200
+    token = response.json()["access_token"]
+
+    return {"Authorization": f"Bearer {token}"}

backend/tests/test_auth.py

@@ -0,0 +1,83 @@
+"""Authentication tests"""
+import pytest
+from httpx import AsyncClient
+
+
+@pytest.mark.asyncio
+async def test_register_user(client: AsyncClient):
+    """Test user registration"""
+    user_data = {
+        "username": "newuser",
+        "email": "newuser@example.com",
+        "password": "password123",
+        "full_name": "New User"
+    }
+
+    response = await client.post("/api/auth/register", json=user_data)
+    assert response.status_code == 201
+
+    data = response.json()
+    assert data["username"] == "newuser"
+    assert data["email"] == "newuser@example.com"
+    assert "wallet_address" in data
+    assert data["balance"] == 100.0  # Starting bonus
+
+
+@pytest.mark.asyncio
+async def test_register_duplicate_user(client: AsyncClient, test_user):
+    """Test registering duplicate user"""
+    user_data = {
+        "username": "testuser",
+        "email": "test@example.com",
+        "password": "password123"
+    }
+
+    response = await client.post("/api/auth/register", json=user_data)
+    assert response.status_code == 400
+
+
+@pytest.mark.asyncio
+async def test_login(client: AsyncClient, test_user):
+    """Test user login"""
+    login_data = {
+        "username": "testuser",
+        "password": "testpassword123"
+    }
+
+    response = await client.post("/api/auth/login", data=login_data)
+    assert response.status_code == 200
+
+    data = response.json()
+    assert "access_token" in data
+    assert "refresh_token" in data
+    assert data["token_type"] == "bearer"
+
+
+@pytest.mark.asyncio
+async def test_login_invalid_credentials(client: AsyncClient, test_user):
+    """Test login with invalid credentials"""
+    login_data = {
+        "username": "testuser",
+        "password": "wrongpassword"
+    }
+
+    response = await client.post("/api/auth/login", data=login_data)
+    assert response.status_code == 401
+
+
+@pytest.mark.asyncio
+async def test_get_current_user(client: AsyncClient, auth_headers):
+    """Test getting current user info"""
+    response = await client.get("/api/auth/me", headers=auth_headers)
+    assert response.status_code == 200
+
+    data = response.json()
+    assert data["username"] == "testuser"
+    assert data["email"] == "test@example.com"
+
+
+@pytest.mark.asyncio
+async def test_get_current_user_unauthorized(client: AsyncClient):
+    """Test getting current user without token"""
+    response = await client.get("/api/auth/me")
+    assert response.status_code == 401

backend/tests/test_blockchain.py

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+"""Blockchain tests"""
+import pytest
+from httpx import AsyncClient
+
+
+@pytest.mark.asyncio
+async def test_get_wallet(client: AsyncClient, auth_headers):
+    """Test getting user wallet"""
+    response = await client.get("/api/blockchain/wallet", headers=auth_headers)
+    assert response.status_code == 200
+
+    data = response.json()
+    assert "address" in data
+    assert "balance" in data
+    assert data["balance"] == 100.0  # Starting balance
+
+
+@pytest.mark.asyncio
+async def test_get_balance(client: AsyncClient, auth_headers):
+    """Test getting wallet balance"""
+    response = await client.get("/api/blockchain/balance", headers=auth_headers)
+    assert response.status_code == 200
+
+    data = response.json()
+    assert "address" in data
+    assert "balance" in data
+
+
+@pytest.mark.asyncio
+async def test_blockchain_stats(client: AsyncClient):
+    """Test getting blockchain stats"""
+    response = await client.get("/api/blockchain/stats")
+    assert response.status_code == 200
+
+    data = response.json()
+    assert "latest_block_index" in data
+    assert "total_blocks" in data
+    assert "difficulty" in data
+
+
+@pytest.mark.asyncio
+async def test_mine_block(client: AsyncClient, auth_headers):
+    """Test mining a block"""
+    response = await client.post("/api/blockchain/mine", headers=auth_headers)
+    assert response.status_code == 200
+
+    data = response.json()
+    assert "index" in data
+    assert "hash" in data
+    assert "reward" in data
+    assert data["reward"] == 50.0  # Mining reward