fix data type, no date

models.py

@@ -1,18 +1,17 @@
 from pydantic import BaseModel, Field
-from datetime import date
-from typing import List, Union, Any
+from typing import List, Optional, Any
 
 
 class Experience(BaseModel):
-    start: Union[date, None] = Field(default=None)
-    end: Union[date, None] = Field(default=None)
+    start: Optional[str] = Field(None, description="Start date in YYYY-MM-DD format")
+    end: Optional[str] = Field(None, description="End date in YYYY-MM-DD format")
     designation: str = Field(...)
     company: str = Field(...)
     experience_description: str = Field(...)
 
 class Education(BaseModel):
-    start: Union[date, None] = Field(default=None)
-    end: Union[date, None] = Field(default=None)
+    start: Optional[str] = Field(None, description="Start date in YYYY-MM-DD format")
+    end: Optional[str] = Field(None, description="End date in YYYY-MM-DD format")
     major: str = Field(...)
     campus: str = Field(...)
     GPA: float = Field(...)
@@ -24,7 +23,6 @@ class CVExtracted(BaseModel):
     achievements: List[str] = Field(...)
     experiences: List[Experience] = Field(...)
     educations: List[Education] = Field(...)
-
 class InsertedText(BaseModel):
     text: str