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Security & Routing Layer                           │\n│ - Global Protection (Helmet, CORS, Rate Limiters)     │\n│ - Session Guards (Access & Refresh Middleware)        │\n└────────────────────────────────────────────────────────┘\n│\n▼\n┌────────────────────────────────────────────────────────┐\n│ 2. Controller Layer (Traffic Control)                 │\n│ - Extracts data & handles HTTP responses              │\n│ - Enforces input safety shapes via Zod schemas        │\n└────────────────────────────────────────────────────────┘\n│\n▼\n┌────────────────────────────────────────────────────────┐\n│ 3. Service Layer (Core Business Logic)                │\n│ - Orchestrates data operations                        │\n│ - Triggers non-blocking background workers            │\n└────────────────────────────────────────────────────────┘\n│\n▼\n┌────────────────────────────────────────────────────────┐\n│ 4. Database Layer (MongoDB Atlas)                     │\n│ - Structured Document Storage                         │\n│ - Specialized performance indexes                     │\n└────────────────────────────────────────────────────────┘\n\n ```","schema":"https://schema.getpostman.com/json/collection/v2.0.0/collection.json","isPublicCollection":true,"owner":"40852797","team":11211650,"collectionId":"443a4e4b-e525-4bc9-9eba-01f64c03d475","publishedId":"2sBXqQHJno","public":true,"publicUrl":"https://documenter-api.postman.tech/view/40852797/2sBXqQHJno","privateUrl":"https://go.postman.co/documentation/40852797-443a4e4b-e525-4bc9-9eba-01f64c03d475","customColor":{"top-bar":"FFFFFF","right-sidebar":"303030","highlight":"FF6C37"},"documentationLayout":"classic-double-column","customisation":{"metaTags":[{"name":"description","value":"A high-performance, RESTful URL shortening service designed for speed and simplicity. 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