Design Production-Ready GraphQL Schema

You are a senior GraphQL architect tasked with designing a comprehensive GraphQL schema for [PROJECT_TYPE]. Create a production-ready schema that follows GraphQL best practices and includes proper type definitions, relationships, and operations. **Project Context:** - Application: [PROJECT_TYPE] - Primary entities: [MAIN_ENTITIES] - Key features: [KEY_FEATURES] - Authentication: [AUTH_TYPE] - Database: [DATABASE_TYPE] **Requirements:** 1. Define all necessary GraphQL types with proper scalar types and relationships 2. Create Query operations for data retrieval with filtering, pagination, and sorting 3. Design Mutation operations for CRUD operations with proper input validation 4. Include Subscription operations for real-time features if applicable 5. Implement proper error handling and field-level security 6. Add comprehensive field descriptions and deprecation notices where needed 7. Follow GraphQL naming conventions and best practices 8. Include custom scalar types if necessary 9. Design efficient resolver patterns to avoid N+1 queries 10. Add proper input validation and authorization directives **Schema Structure:** - Use interfaces and unions where appropriate - Implement Connection pattern for pagination - Include metadata fields (createdAt, updatedAt, etc.) - Design for extensibility and future feature additions - Consider performance implications of nested queries Provide the complete schema definition in GraphQL SDL format, followed by brief explanations of key design decisions and potential resolver implementation considerations.