feat(embedding): support multi-turn conversation context for table RAG #678
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- Add MULTI_TURN_EMBEDDING_ENABLED and MULTI_TURN_HISTORY_COUNT config - Add get_chat_history_questions() to retrieve recent questions from same chat - Add build_context_query() to concatenate history questions with current question - Update calc_table_embedding() to use context query for better table matching - Pass history_questions through get_table_schema() to LLMService This improves table structure retrieval accuracy by considering the full conversation context instead of just the latest question. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
Changes
backend/apps/chat/curd/chat.py: 添加获取历史问题的函数backend/apps/chat/task/llm.py: 传递历史问题到表选择逻辑backend/apps/datasource/crud/datasource.py: 在表嵌入时使用历史问题backend/common/core/config.py: 添加多轮上下文相关配置