code: def _save_traceback_history(self, status, trace, job_exc):
          
          failure_date = datetime.datetime.utcnow()
  
          new_history = {
              "date": failure_date,
              "status": status,
              "exceptiontype": job_exc.__name__
          }
  
          traces = trace.split("---- Original exception: -----")
          if len(traces) > 1:
              new_history["original_traceback"] = traces[1]
          worker = context.get_current_worker()
          if worker:
              new_history["worker"] = worker.id
          new_history["traceback"] = traces[0]
          self.collection.update({
              "_id": self.id
          }, {"$push": {"traceback_history": new_history}})
docs: Create traceback history or add a new traceback to history.