/**
  * Seed job if it does not already exist (to ensure existing data is not overwritten)
  * @param  string $job_name 
  * @return void           
  */
 public function seedJob($job_name)
 {
     $existing_job = RangeCronJob::where('job_name', '=', $job_name)->get();
     if ($existing_job->count() != 0) {
         return null;
     }
     RangeCronJob::create(['job_name' => $job_name, 'last_id_processed' => 0, 'last_status' => 'seeded']);
 }