tRPC Router and Procedure Template

Create tRPC router for:

Feature: {{FEATURE}}
Framework: {{FRAMEWORK}} (Next.js/Express/Fastify)
Data Source: {{DATA_SOURCE}}

Generate complete tRPC structure:

1. **Router Definition:**
   - Router creation
   - Procedure definitions
   - Input validation (Zod)
   - Output validation
   - Middleware

2. **Procedures:**
   - Query procedures
   - Mutation procedures
   - Subscription procedures
   - Protected procedures

3. **Context:**
   - Context creation
   - Session handling
   - Database connection
   - Request info

4. **Middleware:**
   - Auth middleware
   - Logging middleware
   - Rate limiting
   - Error handling

5. **Input/Output Schemas:**
   - Zod schema definitions
   - Reusable schemas
   - Complex validations
   - Type inference

6. **Error Handling:**
   - TRPCError usage
   - Custom error codes
   - Error formatting

7. **Client Setup:**
   - React Query integration
   - Vanilla client
   - Batch linking
   - WebSocket linking

8. **Testing:**
   - Router testing
   - Procedure testing
   - Mock context
   - Integration tests

9. **React Hooks:**
   - useQuery usage
   - useMutation usage
   - Optimistic updates
   - Invalidation

Include server-side caller setup.