}

    public static function cleanup() {
        if (!class_exists('ActionScheduler') || !class_exists('ActionScheduler_Store')) {
            self::save_result(0, 'Action Scheduler ist nicht verfügbar.');
            return;
        }
        if (get_transient('nr_asc_cleanup_lock')) { return; }
        set_transient('nr_asc_cleanup_lock', 1, 10 * MINUTE_IN_SECONDS);
        $deleted = 0;
        $errors = 0;
        $started = microtime(true);
        $limited = false;
        try {
            $store = ActionScheduler::store();
            // Process the less frequent statuses first to avoid starving them.
            $rules = array('failed' => 3, 'canceled' => 0, 'complete' => 0);
            foreach ($rules as $status => $days) {
                if ($deleted >= self::BATCH) { break; }
                if (microtime(true) - $started >= self::MAX_SECONDS) {
                    $limited = true;
                    break;
                }
                $query = array(
                    'status' => $status,
                    'orderby' => 'modified',
                    'order' => 'ASC',
                    'per_page' => self::BATCH - $deleted,
                );
                // No retention period for completed/canceled actions.
                if ($days > 0) {
                    $query['modified'] = new DateTime('-' . $days . ' days', new DateTimeZone('UTC'));
                    $query['modified_compare'] = '<';
                }
                $ids = $store->query_actions($query);
                foreach ($ids as $id) {
                    if (microtime(true) - $started >= self::MAX_SECONDS) {
                        $limited = true;
                        break 2;
                    }
                    try {
                        // An action may have been retried since the query.
                        if ($store->get_status((int) $id) !== $status) { continue; }
                        $store->delete_action((int) $id);
                        ++$deleted;
                    } catch (Throwable $e) {
                        ++$errors;
                        error_log('NR Action Scheduler Cleaner: ' . $e->getMessage());
                    }
                }
            }
            $message = $errors ? $errors . ' Fehler; siehe PHP-Fehlerprotokoll.' : 'OK';
            if ($limited) {
                $message .= ' Zeitbudget erreicht; Fortsetzung beim nächsten Lauf.';
            } elseif ($deleted >= self::BATCH) {
                $message .= ' Löschlimit erreicht; weitere alte Aktionen ggf. beim nächsten Lauf.';
            }
            self::save_result($deleted, $message);
        } catch (Throwable $e) {
            self::save_result($deleted, 'Fehler; siehe PHP-Fehlerprotokoll.');
            error_log('NR Action Scheduler Cleaner: ' . $e->getMessage());
        } finally {
            delete_transient('nr_asc_cleanup_lock');
        }
    }

    private static function save_result($count, $message) {
        update_option(self::OPTION, array('time' => current_time('mysql'), 'deleted' => (int) $count, 'message' => $message), false);
    }

    public static function widget() {
        if (current_user_can('manage_options')) {
            wp_add_dashboard_widget('nr_asc_dashboard', 'NR – Action Scheduler Cleaner', array(__CLASS__, 'render'));
        }
    }

    public static function render() {
        $last = get_option(self::OPTION, array());
        echo '<p><strong>Automatische Bereinigung:</strong> alle 12 Stunden (WP-Cron; abhängig vom Cron-Aufruf)</p>';
        echo '<p>Abgeschlossen/Abgebrochen: keine Aufbewahrung · Fehlgeschlagen: 3 Tage<br>Maximal ' . esc_html(self::BATCH) . ' Aktionen je Durchlauf; Zeitbudget ' . esc_html(self::MAX_SECONDS) . ' Sekunden.</p>';
        if (!empty($last)) {
            echo '<p><strong>Letzter Lauf:</strong> ' . esc_html($last['time']) . '<br>';
            echo '<strong>Gelöscht:</strong> ' . esc_html($last['deleted']) . '<br>';
            echo '<strong>Status:</strong> ' . esc_html($last['message']) . '</p>';
        } else {
            echo '<p>Noch keine Bereinigung ausgeführt.</p>';
        }
        $next = wp_next_scheduled(self::CRON);
        if ($next) {
            echo '<p><strong>Nächster Lauf:</strong> ' . esc_html(wp_date('d.m.Y H:i', $next)) . '</p>';
        }
        echo '<form method="post" action="' . esc_url(admin_url('admin-post.php')) . '">';
        echo '<input type="hidden" name="action" value="nr_asc_cleanup">';
        wp_nonce_field(self::NONCE);
        submit_button('Jetzt bereinigen (max. ' . self::BATCH . ')', 'secondary', 'submit', false);
        echo '</form>';
        if (isset($_GET['nr_asc_done'])) {
            echo '<p><strong>Bereinigung ausgeführt.</strong> Ergebnis siehe oben.</p>';
        }
    }

    public static function manual() {
        if (!current_user_can('manage_options')) { wp_die('Keine Berechtigung.'); }
        check_admin_referer(self::NONCE);
        self::cleanup();
        wp_safe_redirect(add_query_arg('nr_asc_done', '1', admin_url('index.php')));
        exit;
    }
}
NR_Action_Scheduler_Cleaner::init();
register_deactivation_hook(__FILE__, function () {
    wp_clear_scheduled_hook(NR_Action_Scheduler_Cleaner::CRON);
});