removed _prep_objects call from activity import

_prep_objects is not doing anything there, _oid is already in the object (copied from the parent version).
We are not overriding it with the purpose of being used in activity_import in any of our cubes
(we will be overriding it for use in get_objects)

metrique/cubes/sqldata/generic.py

@@ -181,7 +181,6 @@ def _activity_import_doc(self, time_doc, activities):
                     pass  # leave as-is
         except Exception as e:
             logger.error('Error updating creation time; %s' % e)
-        batch_updates = self._prep_objects(batch_updates)
         return batch_updates
 
     def _activity_backwards(self, val, removed, added):