code: def add(self, items):
          
          with _presub_lock:
              self.load_from_cloud()
              for entry in utils.ensure_listable(items):
                  # add new entries, but only if they're unique
                  if entry not in self.current:
                      self.current.append(entry)
              self.save_to_cloud()
docs: Add entry to global presubs list