[concrete5 legacy] A job to deletes empty "Compare Versions" alerts.

clear_empty_workflow_progress.php

<?php

defined('C5_EXECUTE') or die("Access Denied.");

class ClearEmptyWorkflowProgress extends Job
{

    public function getJobName()
    {
        return t("Clear Empty Workflow Progress");
    }

    public function getJobDescription()
    {
        return t("Deletes empty \"Compare Versions\" alert.");
    }

    public function run()
    {
        // retrieve all pending page workflow progresses
        $list = PageWorkflowProgress::getPendingWorkflowProgressList();
        $r = $list->get();
        foreach ($r as $w) {
            $wp = $w->getWorkflowProgressObject();
            $wo = $wp->getWorkflowObject();
            if ($wo instanceof EmptyWorkflow) {
                $wp->delete();
            }
        }
    }
}

Modern Version: https://gist.github.com/hissy/5ea2147516a90710919d