Funktion / Cron Job zum automatischen Löschen von Beiträgen funktioniert nicht

// Cron Job to Delete VFB Entries older than 60 daysif(!wp_next_scheduled( 'remove_old_vfb_entries')){
    wp_schedule_event(time(), 'daily', 'remove_old_vfb_entries');
}
add_action('remove_old_vfb_entries', 'myd_remove_old_vfb_entries');




// Build the function
function myd_remove_old_vfb_entries(){
global $wpdb;
// Set max post date and post_type name
$date = date("Y-m-d H:i:s", strtotime('-60 days'));
$post_type = 'vfb_entry';




// Build the query 
// Only select VFB Entries from LFG or LFM Form
$query = "
    SELECT $wpdb->posts.ID FROM $wpdb->posts 
    WHERE post_type = '$post_type' 
    AND post_status = 'publish' 
    AND post_date < '$date'
    AND ($wpdb->posts.ID IN (SELECT entry_id FROM $wpdb->postmeta_lfg4 WHERE post_id IS NOT NULL) OR $wpdb->posts.ID IN (SELECT entry_id FROM $wpdb->postmeta_lfm3 WHERE post_id IS NOT NULL))
    ORDER BY post_modified DESC
";
$results = $wpdb->get_results($query);
            foreach($results as $post){
                // Let the WordPress API clean up the entire post trails
                wp_delete_post( $post->ID, true);
          }
}