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This tutorial explains MongoDB schema design for Claudius, a Claude-based chatbot using LangGraph. The key insight: don't store messages in a separate table; instead keep them with the agent's persisted state to avoid expensive joins. This exemplifies document modeling's core principle—organize data around how the application accesses it, not around logical data structure.

• •Document modeling shapes data around application access patterns, not data structure
• •LangGraph checkpointer persists agent state; messages live there, not in a separate table
• •Zod schemas unified for runtime validation and TypeScript types; includes discriminated unions and TTL index patterns

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