Review this system architecture and identify potential issues: ``` Architecture: E-commerce Platform Frontend: React SPA → CDN (CloudFront) ↓ API Gateway → Lambda Functions (Node.js) ↓ ├── User Service → MongoDB (single replica) ├── Product Service → PostgreSQL (single instance) ├── Order Service → MySQL (single instance) ├── Payment Service → External API (Stripe) └── Search Service → Elasticsearch (single node) ↓ All services share one AWS account Secrets stored in environment variables Logging: console.log to CloudWatch No rate limiting CORS: Access-Control-Allow-Origin: * ``` What are the risks? Prioritize fixes by impact and effort.