@Secured({ ROLE })
    public HtmlResponse deleteall() {
        verifyToken(this::asListHtml);
        searchLogPager.clear();
        // TODO delete logs
        saveInfo(messages -> messages.addSuccessCrawlingInfoDeleteAll(GLOBAL));
        return redirect(getClass());
    }

    // ===================================================================================

    @Execute
    public JsonResponse<ApiResult> delete$all() {
        try {
            crawlingInfoService.deleteOldSessions(processHelper.getRunningSessionIdSet());
            saveInfo(messages -> messages.addSuccessCrawlingInfoDeleteAll(GLOBAL));
        } catch (final Exception e) {
            logger.warn("Failed to process a request.", e);

        verifyToken(this::asListHtml);
        crawlingInfoService.deleteOldSessions(processHelper.getRunningSessionIdSet());
        crawlingInfoPager.clear();
        saveInfo(messages -> messages.addSuccessCrawlingInfoDeleteAll(GLOBAL));
        return redirect(getClass());
    }

    // ===================================================================================

     * <pre>
     * message: Deleted session data.
     * </pre>
     * @param property The property name for the message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addSuccessCrawlingInfoDeleteAll(String property) {
        assertPropertyNotNull(property);
        add(property, new UserMessage(SUCCESS_crawling_info_delete_all));
        return this;
    }

    /**