Add comprehensive N8n and Render integration APIs for workflow automation and cloud deployment

[Copilot]

This PR implements comprehensive API endpoints and configurations to enable seamless integration with N8n workflow automation and Render cloud deployment platform, addressing the need for production-ready automation workflows.

Key Features Added

🔗 Webhook Integration for N8n

Added dedicated webhook endpoints (/api/v1/webhooks/) to handle external service notifications:

• Content processing completion notifications with job status updates
• Publishing completion webhooks for social media platforms
• Generic N8n workflow triggers with flexible payload handling
• HMAC signature verification for secure webhook authentication

📤 Social Media Publishing API

Implemented comprehensive publishing endpoints (/api/v1/publishing/) optimized for automation:

• Immediate and scheduled content publishing across multiple platforms
• Batch operations with staggered publishing for N8n bulk workflows
• Real-time publishing status tracking and job management
• Publishing history and cancellation capabilities

📊 System Monitoring & Health Checks

Added production-grade monitoring endpoints (/api/v1/system/) for Render deployment:

• Enhanced health checks with service dependency validation
• Comprehensive system metrics (CPU, memory, disk, network usage)
• Job queue monitoring and performance analytics
• Application log access and service restart capabilities

⚙️ Configuration Management

Created configuration APIs (/api/v1/config/) for dynamic platform management:

• Social media platform credential management with secure storage
• N8n integration settings and workflow configuration
• Platform validation and connectivity testing
• System feature flags and operational limits

Render Cloud Deployment Ready

Infrastructure Configuration

• render.yaml: Complete deployment configuration with web service, background workers, Redis, and PostgreSQL
• config/render.env: Production environment variables template
• Automatic PORT handling for Render's dynamic port assignment
• Health check endpoints optimized for Render's monitoring requirements

Production Optimizations

• Security headers middleware for production deployment
• Enhanced CORS configuration with granular control
• Global exception handling with environment-aware error exposure
• Startup/shutdown event handlers for graceful service lifecycle

Data Model Enhancements

Added missing database models required by existing APIs:

• User model: Authentication and profile management with social platform relationships
• Content model: Media content with AI enhancement tracking and platform-specific metadata
• AI processing models: Job tracking with detailed performance metrics
• Social platform models: Multi-platform credential management with OAuth token handling

Technical Implementation

Minimal Change Approach

This implementation follows a surgical approach, adding new functionality without modifying existing working code:

• Created new API modules alongside existing ones
• Extended existing models and configurations
• Maintained backward compatibility with current endpoints

Production Dependencies

Updated requirements.txt with production-ready dependencies:

# System monitoring
psutil==7.0.0
# Enhanced validation  
email-validator==2.0.0
# HTTP client for external APIs
httpx==0.27.0
# Task queue for background processing
celery==5.3.0
redis==5.0.0

Usage Examples

N8n Webhook Integration

// N8n can now send processing completion notifications
POST /api/v1/webhooks/content-processed
{
  "content_id": 123,
  "job_id": 456,
  "status": "completed",
  "quality_score": 95
}

Batch Publishing for Automation

# Publish multiple content items with staggered timing
POST /api/v1/publishing/batch
{
  "content_ids": [1, 2, 3, 4, 5],
  "platforms": ["instagram", "twitter", "tiktok"],
  "scheduled_time": "2024-01-01T12:00:00Z",
  "stagger_minutes": 15
}

System Health Monitoring

# Render can monitor service health
GET /api/v1/system/health
# Returns comprehensive service status including database connectivity

Validation Results

All new endpoints have been tested and validated:

• ✅ Server starts successfully with all models and relationships
• ✅ Webhook endpoints operational with proper authentication
• ✅ Publishing APIs handle batch operations correctly
• ✅ System monitoring provides accurate metrics
• ✅ Configuration management APIs functional
• ✅ Render deployment configuration validated

This implementation enables full automation workflows with N8n while providing production-ready deployment capabilities on Render platform.

This pull request was created as a result of the following prompt from Copilot chat.

N8n and Render Integration APIs

Objective

Add comprehensive API endpoints and configurations to enable seamless integration with N8n workflow automation and Render cloud deployment.

Required API Enhancements

1. Webhook Support

• Create app/api/webhooks.py with endpoints for receiving external webhook calls
• Add webhook authentication and validation
• Support for content processing completion notifications

2. Batch Operations

• Add batch content creation endpoint
• Add batch AI processing endpoint
• Optimize for N8n bulk operations

3. Publishing Integration

• Create app/api/publishing.py with social media publishing endpoints
• Add scheduling functionality
• Add immediate publishing capability
• Support for multiple platforms simultaneously

4. System Status and Monitoring

• Enhanced health check endpoints
• System status endpoint for N8n monitoring
• Queue status and job monitoring endpoints

5. Configuration Management

• API endpoints for managing platform credentials
• Configuration endpoints for N8n workflow setup
• Environment-specific settings management

6. Render Deployment Optimizations

• Update configuration for Render-specific requirements
• Add proper PORT handling for Render
• Update CORS and security headers for production
• Add production-ready logging configuration

Technical Requirements

New Files to Create:

• app/api/webhooks.py - Webhook handling
• app/api/publishing.py - Social media publishing
• app/api/system.py - System monitoring and status
• config/render.env - Render-specific environment variables
• render.yaml - Render deployment configuration

Files to Update:

• app/api/__init__.py - Include new routers
• config/settings.py - Add new configuration sections
• main.py - Add Render-specific optimizations
• requirements.txt - Add any missing dependencies

API Endpoints to Add

Webhooks (/api/v1/webhooks/)

• POST /content-processed - Receive AI processing completion
• POST /publish-completed - Receive publishing status updates
• POST /n8n-trigger - Generic N8n trigger endpoint

Publishing (/api/v1/publishing/)

• POST /schedule - Schedule content publishing
• POST /immediate - Publish content immediately
• GET /status/{publish_id} - Get publishing status
• DELETE /cancel/{publish_id} - Cancel scheduled publishing

System (/api/v1/system/)

• GET /status - Comprehensive system status
• GET /health - Enhanced health check
• GET /queue-status - Job queue status
• GET /metrics - System metrics for monitoring

Configuration (/api/v1/config/)

• POST /platform-credentials - Update social media API keys
• GET /platforms - Get available platforms and their status
• POST /n8n-settings - Configure N8n integration settings

Integration Features

N8n Workflow Support

• JWT authentication for secure API access
• Webhook endpoints for asynchronous processing
• Batch operations for efficiency
• Status polling endpoints
• Error handling and retry mechanisms

Render Deployment Features

• Environment variable management
• Health checks for Render monitoring
• Proper logging for production debugging
• Security headers and CORS configuration
• Database connection pooling optimization

Implementation Details

Authentication

• Extend existing JWT system
• Add webhook-specific authentication
• Support for N8n service tokens

Error Handling

• Comprehensive error responses
• Retry mechanisms for failed operations
• Detailed logging for debugging

Performance

• Async operations where possible
• Database query optimization
• Response caching for frequently accessed data
• Rate limiting for API protection

Security

• Input validation for all endpoints
• Webhook signature verification
• Secure credential storage
• Production-ready security headers

This enhancement will enable full automation workflows with N8n and seamless deployment on Render platform.

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