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Provides comprehensive guidance for Convex backend development including database operations, queries, mutations, actions, schemas, authentication, file storage, real-time subscriptions, scheduling, HTTP APIs, search, AI agents, and deployment. MUST activate when user asks about: backend data operations, Convex functions, database queries, schemas, real-time data, auth setup, file uploads, scheduled jobs, HTTP endpoints, or any Convex-specific implementation questions. DO NOT activate for frontend UI/styling or general React component questions unrelated to Convex.