Prompt

Design an efficient GraphQL API with proper schema design, resolvers, and performance optimization:

**Schema Design:**
- Type definitions with clear relationships
- Query and mutation structures
- Subscription patterns
- Custom scalar types
- Interface and union types

**Performance Optimization:**
- DataLoader implementation
- Query complexity analysis
- Depth limiting strategies
- Caching approaches
- N+1 query prevention

**Security & Best Practices:**
- Authentication/authorization patterns
- Rate limiting implementation
- Error handling standards
- Versioning strategies
- Documentation generation

Use case: {INSERT USE CASE}