Added history track

backend/src/models.py

@@ -211,6 +211,8 @@ class RequirementResponse(BaseModel):
     validated_by: Optional[str] = None  # Username of the validator
     validated_at: Optional[datetime] = None  # When the latest validation was made
     validation_version: Optional[int] = None  # Version at which requirement was validated
+    author_username: Optional[str] = None  # Display name of who created the requirement
+    last_editor_username: Optional[str] = None  # Display name of who last edited the requirement
 
     class Config:
         from_attributes = True
@@ -240,6 +242,22 @@ class RequirementUpdateRequest(BaseModel):
     group_ids: Optional[List[int]] = None
 
 
+class RequirementHistoryResponse(BaseModel):
+    """Response schema for requirement history (previous versions)."""
+    history_id: int
+    version: Optional[int] = None
+    req_name: Optional[str] = None
+    req_desc: Optional[str] = None
+    tag_code: Optional[str] = None
+    priority_name: Optional[str] = None
+    edited_by_username: Optional[str] = None
+    valid_from: Optional[datetime] = None
+    valid_to: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
 # Relationship Type schemas
 class RelationshipTypeResponse(BaseModel):
     """Response schema for a relationship type."""