User Management API

A production-style REST API built with Go, Fiber, PostgreSQL, SQLC, Uber Zap, and Validator for managing users and dynamically calculating age from date of birth.

The application follows a clean layered architecture:

Request
→ Route
→ Handler
→ Service
→ Repository
→ SQLC
→ PostgreSQL

Features

Feature	Status
Create User	✅
Get User by ID	✅
Update User	✅
Delete User	✅
List Users	✅
Dynamic Age Calculation	✅
PostgreSQL Integration	✅
SQLC Generated Queries	✅
Request Validation	✅
Structured Logging (Zap)	✅
Request ID Middleware	✅
Request Duration Logging	✅
Pagination	✅
Graceful Shutdown	✅
Docker Support	✅
Unit Tests	✅

Tech Stack

• Go
• Fiber
• PostgreSQL
• SQLC
• Uber Zap
• go-playground/validator
• Docker
• Docker Compose

API Endpoints

Method	Endpoint	Description
POST	/users	Create a user
GET	/users/:id	Get a user by ID
PUT	/users/:id	Update a user
DELETE	/users/:id	Delete a user
GET	/users	List users with pagination

Sample Response

{
  "id": 1,
  "name": "Alice Johnson",
  "dob": "1998-04-23",
  "age": 28
}

Age is calculated dynamically from the stored date of birth and is never persisted in the database.