working on backend

app/api/admin.py

@@ -90,14 +90,14 @@ class UserResponse(BaseModel):
     id: int
     username: str
     email: str
-    first_name: Optional[str]
-    last_name: Optional[str]
-    is_admin: bool
-    is_active: bool
-    is_approver: bool
-    last_login: Optional[datetime]
-    created_at: Optional[datetime]
-    updated_at: Optional[datetime]
+    first_name: Optional[str] = None
+    last_name: Optional[str] = None
+    is_admin: bool = False
+    is_active: bool = True
+    is_approver: bool = False
+    last_login: Optional[datetime] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
     
     model_config = ConfigDict(from_attributes=True)