Build a User Management CRUD Flow with React and Next.js

Implement a user-management interface with React and Next.js, including backend endpoints for creating, reading, updating, and deleting user records. Complete the basic UI-to-backend flow before extending it with search and pagination. ### Constraints and Clarifying Questions The data model may be simplified. Choose and state a minimal record schema, validation rules, persistence approach, and router style. Search and pagination are extensions rather than prerequisites for a working CRUD demonstration. This exercise's reported round did not allow AI assistance; do not assume generated code is required. ### What a Strong Answer Covers A coherent record contract, HTTP operations, server validation, form and list state, error handling, and verification of each mutation through a subsequent read. Explain the limitations of any in-memory demonstration store. ### Follow-up Questions - How would two clients avoid silently overwriting each other's edits? - How would search and pagination preserve a stable ordering?