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

        LogNotificationHelper helper = new LogNotificationHelper();
        // destroy() without init() should not throw NPE because of null checks
        helper.destroy();
    }

    @Test
    public void test_init_destroy_multipleRounds() {
        LogNotificationHelper helper = new LogNotificationHelper();
        helper.init();
        helper.destroy();
        // Second round
        helper.init();

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)

        } 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 {

import org.apache.logging.log4j.core.config.plugins.PluginElement;
import org.apache.logging.log4j.core.config.plugins.PluginFactory;
import org.codelibs.fess.helper.LogNotificationHelper;
import org.codelibs.fess.helper.LogNotificationHelper.LogNotificationEvent;

/**
 * Custom Log4j2 Appender that captures log events into a buffer for notification purposes.
 */

import java.util.ArrayList;
import java.util.List;

import org.codelibs.core.lang.StringUtil;
import org.codelibs.fess.exception.UserRoleLoginException;
import org.codelibs.fess.helper.CrawlingConfigHelper;
import org.codelibs.fess.helper.PermissionHelper;
import org.codelibs.fess.util.ComponentUtil;
import org.dbflute.optional.OptionalThing;
import org.lastaflute.di.util.LdiFileUtil;
import org.lastaflute.web.login.LoginManager;

import java.util.concurrent.atomic.AtomicInteger;

import org.codelibs.core.misc.DynamicProperties;
import org.codelibs.fess.exception.ContainerNotAvailableException;
import org.codelibs.fess.helper.SystemHelper;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.opensearch.client.SearchEngineClient;
import org.codelibs.fess.thumbnail.ThumbnailManager;

import org.codelibs.fess.app.service.PathMappingService;
import org.codelibs.fess.helper.CrawlingInfoHelper;
import org.codelibs.fess.helper.DataIndexHelper;
import org.codelibs.fess.helper.DuplicateHostHelper;
import org.codelibs.fess.helper.NotificationHelper;
import org.codelibs.fess.helper.PathMappingHelper;
import org.codelibs.fess.helper.SystemHelper;
import org.codelibs.fess.helper.WebFsIndexHelper;
import org.codelibs.fess.mylasta.direction.FessConfig;

        assertProvideThrowsException("тестклассификация");
        assertProvideThrowsException("🔥TestClassification");
        assertProvideThrowsException("Test😀Classification");
    }

    // Helper method to assert that provide() throws ProvidedClassificationNotFoundException
    private void assertProvideThrowsException(String classificationName) {
        try {
            provider.provide(classificationName);