Restaurant Management System – Complete PostgreSQL Database Schema (ERD)

Restaurant Management System built on PostgreSQL. The schema covers essential components such as:

User authentication and roles (admin, staff)

Client and reservation tracking

Order management with individual order items

Menu with categorized items and ingredients

Inventory transactions and real-time stock control

Payment processing and logging

The ERD is optimized for scalability, consistency, and practical implementation, making it suitable for real-world restaurant operations or as a backend foundation for POS (Point of Sale) systems and digital ordering solutions.