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create table job_lists (
  job_list_id  bigint unsigned not null primary key auto_increment,
...
  foreign key fk_jobs_to_job_lists (job_list_id)
    references job_lists (job_list_id) on delete cascade
) engine=innodb charset=utf8;

#!/usr/bin/perl -w

...
  # Do your thing here...
}# end process_job()