final CoordinatorHelper helper = createCapturingHelper("node1@host1", null, null, createMockResponse(200, searchResponse));
        setLastEventCheckTime(helper, 4000L);

        helper.fetchNewEvents();

        // lastEventCheckTime should be max(createdTime) + 1 = 7001
        assertEquals(7001L, getLastEventCheckTime(helper));
    }

    @Test

        assertNotNull(helper.duplicateHostList);
        assertEquals(1, helper.duplicateHostList.size());
        assertEquals("www.test.com", helper.duplicateHostList.get(0).getRegularName());
    }

    @Test
    public void test_add_withNullList() {
        DuplicateHostHelper helper = new DuplicateHostHelper();
        helper.duplicateHostList = null;

import org.codelibs.fess.helper.LabelTypeHelper;
import org.codelibs.fess.helper.OsddHelper;
import org.codelibs.fess.helper.PopularWordHelper;
import org.codelibs.fess.helper.QueryHelper;
import org.codelibs.fess.helper.RoleQueryHelper;
import org.codelibs.fess.helper.SearchHelper;
import org.codelibs.fess.helper.UserInfoHelper;
import org.codelibs.fess.mylasta.action.FessUserBean;

import org.codelibs.fess.helper.PathMappingHelper;
import org.codelibs.fess.helper.PermissionHelper;
import org.codelibs.fess.helper.PluginHelper;
import org.codelibs.fess.helper.PopularWordHelper;
import org.codelibs.fess.helper.ProcessHelper;
import org.codelibs.fess.helper.ProtocolHelper;
import org.codelibs.fess.helper.QueryHelper;
import org.codelibs.fess.helper.RateLimitHelper;

### Service
- Inject behaviors (Bhv) for data access
- Use `OptionalEntity<T>` for nullable returns
- Plain classes (no extends/implements)

### Helper
- Stateless utility classes
- Access via `ComponentUtil.getXyzHelper()`
- Named with "Helper" suffix

### DBFlute Generated Code
```
opensearch/{index}/
├── bsentity/, bsbhv/    # Base classes (DO NOT EDIT)

        // Test default state
        assertTrue(helper.isCrawlerRunning());

        // Test setting to false
        helper.setCrawlerRunning(false);
        assertFalse(helper.isCrawlerRunning());

        // Test setting back to true
        helper.setCrawlerRunning(true);
        assertTrue(helper.isCrawlerRunning());
    }

    @Test

import org.codelibs.fess.Constants;
import org.codelibs.fess.app.web.base.login.FessLoginAssist;
import org.codelibs.fess.helper.AccessTokenHelper;
import org.codelibs.fess.helper.ActivityHelper;
import org.codelibs.fess.helper.SystemHelper;
import org.codelibs.fess.helper.ViewHelper;
import org.codelibs.fess.mylasta.action.FessHtmlPath;
import org.codelibs.fess.mylasta.action.FessMessages;

import org.codelibs.fess.app.web.api.ApiResult.Status;
import org.codelibs.fess.app.web.api.admin.FessApiAdminAction;
import org.codelibs.fess.exception.FessSystemException;
import org.codelibs.fess.helper.PermissionHelper;
import org.codelibs.fess.helper.SuggestHelper;
import org.codelibs.fess.opensearch.config.exentity.ElevateWord;
import org.codelibs.fess.util.ComponentUtil;
import org.lastaflute.web.Execute;

        } catch (final Exception e) {
            return;
        }

        final LogNotificationHelper helper;
        try {
            helper = ComponentUtil.getLogNotificationHelper();
        } catch (final Exception e) {
            return;
        }

        final List<LogNotificationEvent> events = helper.drainAll();
        if (events.isEmpty()) {
            return;
        }

        try {

    /**
     * Default constructor for DuplicateHostHelper.
     * Creates a new duplicate host helper instance.
     */
    public DuplicateHostHelper() {
        // Default constructor
    }

    /**
     * Initializes the duplicate host helper after construction.
     * Loads duplicate host configurations from the DuplicateHostService.
     */
    @PostConstruct