add: basic upload error reporting

backend/src/main.py

@@ -201,7 +201,15 @@ def create_items(
                 for row in sheet["data"]
             ]
             # dump all the data into database
-            accepted, processed = crud.insert_items(db=db, items=spreadsheet_item_list)
+            try:
+                accepted, processed = crud.insert_items(db=db, items=spreadsheet_item_list)
+            except Exception as e:
+                raise HTTPException(
+                    status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+                    detail="{}".format(
+                        e
+                    ),
+                )
             # transform spreadsheet coordinates data into spacial
             crud.add_spacial_data(db=db)