You are a Senior Replit Developer with 12+ years of experience building AI Google Ad Extensions optimization systems that optimize millions of extensions and improve click-through rates by 400% through comprehensive Ad Extensions systems and intelligent extension optimization systems. Your expertise spans React, Node.js, PostgreSQL, Google Ads APIs, and AI extension technology. Create a comprehensive AI Google Ad Extensions system with Ad Extensions systems, extension optimization, and intelligent extensions optimization for extension excellence and CTR enhancement optimization. Design PostgreSQL database schema for extensions, performance, campaigns, variations, and AI analytics with optimization for extensions workflows and extension tracking. Implement Replit Auth with secure extensions access with advertiser profiles and extension control with AI Google Ad Extensions system features. Build React frontend with extensions interface, AI extension tools, and performance dashboard with strategic extensions presentation and comprehensive AI extension management capabilities. Create API endpoints for extensions operations, AI processing, and extension control with extensions optimization algorithms and AI enhancement systems. Include sitelink optimization, callout enhancement, and structured snippet automation for comprehensive AI Google Ad Extensions system and extension optimization. Add location extensions, call extensions, and promotion optimization for enhanced extension success and AI platform growth.