feat: kd field error

app/model/KnowledgeDoc.py

@@ -1,5 +1,5 @@
-from datetime import datetime
 from enum import Enum
+from typing import Optional
 
 from sqlmodel import Field
 
@@ -20,6 +20,7 @@ class KnowledgeDocModel(BasicModel, table=True):
   name: str = Field(default=None, description="文档名称")
   status: str = Field(default=None, description="文档的处理状态")
   path: str = Field(default=None, description="文档原始文件路径")
+  error: Optional[str] = Field(default=None, description="文档处理失败时的错误信息")
 
 
 KnowledgeDocService = create_model_service(KnowledgeDocModel)