+ def update_timestamps_when_state_changes
+ return if not (state_changed? or new_record?)
+
+ case state
+ when RunningOnServer, RunningOnClient
+ self.started_at ||= db_current_time
+ when Failed, Complete
+ current_time = db_current_time
+ self.started_at ||= current_time
+ self.finished_at ||= current_time
+ end
+ end
+