+ t.add :started_at
+ t.add :finished_at
+ end
+
+ protected
+
+ def delete_created_job_tasks_if_failed
+ if self.success == false and self.success != self.success_was
+ JobTask.delete_all ['created_by_job_task_uuid = ?', self.uuid]
+ end
+ end
+
+ def set_default_qsequence
+ self.qsequence ||= self.class.connection.
+ select_value("SELECT nextval('job_tasks_qsequence_seq')")
+ end
+
+ def create_disabled
+ raise "Disabled"
+ end
+
+ def update_disabled
+ raise "Disabled"