docs: def terminate_obsolete(self):
          """
          Check chats can be considered as obsolete to terminate them
          """
          chats_terminated = []
          live_chats = Chat.live.all()
          for live_chat in live_chats:
              if live_chat.is_obsolete(self.time_obsolete_offset):
                  live_chat.terminate()
                  live_chat.save()
                  chats_terminated.append(live_chat)
          return chats_terminated