Supermarket System ERD with role-based access control integrates product catalog, inventory, customer orders, and a hierarchical permissions model. Categories link to Products, which connect to Inventory tracking and Order Items; Customers place Orders managed by Users with role-based Group Permissions and individual User Permission Overrides. This architecture demonstrates separation of concerns—operational data (products, orders) isolated from identity and access control (users, groups, permissions)—enabling secure, scalable retail operations. Fork this diagram on Diagrams.so to customize entity relationships, add audit fields, or extend permissions for multi-tenant scenarios. The dual-layer permission system (group-based + user overrides) supports both policy-driven access and exception handling common in enterprise retail deployments.