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  "user_summary": {
    "text": "用一句话解释索引",
    "has_image": false,
    "has_tool_result": false
  },
  "assistant_summary": {
    "text": "索引就是数据库里一种类似书目录的结构，用来快速定位数据，避免全表扫描。",
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    "stop_reason": "stop"
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