Foreign key constraint error upon deleting jobs

Me again!

If I remove a cronjob and run `php bin/console shapecode:cron:scan` , I get a database error 

>  SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`mydb`.`cron_job_result`, CONSTRAINT `FK_ABC123XYZ` FOREIGN KEY (`cron_job_id`) REFERENCES `cron_job` (`id`))