Backend Development Guidelines Use this skill for backend and API work across , , and . When to Apply - Creating or modifying tRPC routers and procedures - Creating or modifying public API endpoints - Creating or modifying queue processors, producers, or queue-backed workflows - Building or refactoring backend services and repositories - Working on backend auth, middleware, validation, or observability - Updating Prisma or ClickHouse access patterns - Adding a field, option, flag, or enum member to shared backend code - Adding or fixing backend tests How to Read This Skill - Use this when the…