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6b73f00281
Update the AI chat API design documentation to provide comprehensive details about statistics collection during streaming conversations. The documentation now includes: 1. **Enhanced statistics collection logic**: - Clarified message_count increments for user messages, AI responses, and tool results - Added LLM call tracking via on_chat_model_start events - Detailed token counting methodology using LangGraph's usage_metadata 2. **Improved implementation details**: - Added specific event handlers for statistics collection - Explained LangGraph's cumulative token counting behavior - Provided real-world examples of token accumulation 3. **Updated data models**: - Enhanced ChatSession model documentation with field descriptions - Separated fields into categories (basic, statistics, timestamps, reserved) 4. **Refined architecture documentation**: - Added detailed flow for stream_chat method - Documented statistics collection mechanism during SSE streaming - Explained batch update strategy to reduce database writes The changes ensure developers understand how conversation statistics are collected, processed, and stored without impacting streaming performance.