code: def add_log_entry(self, entry):
          
          event_log = self.job_record.event_log
          if len(event_log) > job.MAX_NUMBER_OF_EVENTS:
              del event_log[-1]
          event_log.insert(0, entry)
docs: :db.model.job record holds event log, that can be accessed by MX
              this method adds a record and removes oldest one if necessary