{
"id": 6,
"knowledge_type": "expert_case",
"title": "某汽车零部件企业材料优化案例",
"source_name": "专家库",
"source_version": "-",
"effective_at": "-",
"attachment_path": "-",
"content_text": "通过材料选型优化和工艺改进，成功将产品寿命提升30%...",
"updated_at": "2026-07-11 11:00:00"
}