/**
 * Adds restrictions for finding only scheduled jobs.
 * @param QUERY $query
 * @access private
 */
function restrict_to_scheduled($query)
{
    $query->add_table('project_releases rel_sched', 'rel_sched.id = entry.release_id');
    $query->restrict('not ISNULL(rel_sched.time_next_deadline)');
    $query->restrict('rel_sched.time_next_deadline <> \'\'');
    $query->restrict('rel_sched.time_next_deadline <> \'00-00-0000 00:00:00\'');
    $query->add_order('rel_sched.time_next_deadline ASC', true);
    $query->store_order_as_recent();
}