added delete method

common/dao-api/src/main/java/org/thingsboard/server/dao/trendz/TrendzSettingsService.java

@@ -24,4 +24,6 @@ public interface TrendzSettingsService {
 
     TrendzSettings findTrendzSettings(TenantId tenantId);
 
+    void deleteTrendzSettings(TenantId tenantId);
+
 }

dao/src/main/java/org/thingsboard/server/dao/tenant/TenantServiceImpl.java

@@ -44,6 +44,7 @@ import org.thingsboard.server.dao.service.PaginatedRemover;
 import org.thingsboard.server.dao.service.Validator;
 import org.thingsboard.server.dao.service.validator.TenantDataValidator;
 import org.thingsboard.server.dao.settings.AdminSettingsService;
+import org.thingsboard.server.dao.trendz.TrendzSettingsService;
 import org.thingsboard.server.dao.usagerecord.ApiUsageStateService;
 import org.thingsboard.server.dao.user.UserService;
 
@@ -81,6 +82,8 @@ public class TenantServiceImpl extends AbstractCachedEntityService<TenantId, Ten
     @Autowired
     private QrCodeSettingService qrCodeSettingService;
     @Autowired
+    private TrendzSettingsService trendzSettingsService;
+    @Autowired
     private TenantDataValidator tenantValidator;
     @Autowired
     protected TbTransactionalCache<TenantId, Boolean> existsTenantCache;
@@ -166,6 +169,7 @@ public class TenantServiceImpl extends AbstractCachedEntityService<TenantId, Ten
         adminSettingsService.deleteAdminSettingsByTenantId(tenantId);
         qrCodeSettingService.deleteByTenantId(tenantId);
         notificationSettingsService.deleteNotificationSettings(tenantId);
+        trendzSettingsService.deleteTrendzSettings(tenantId);
 
         tenantDao.removeById(tenantId, tenantId.getId());
         publishEvictEvent(new TenantEvictEvent(tenantId, true));

dao/src/main/java/org/thingsboard/server/dao/trendz/DefaultTrendzSettingsService.java

@@ -60,4 +60,10 @@ public class DefaultTrendzSettingsService implements TrendzSettingsService {
                 .orElseGet(TrendzSettings::new);
     }
 
+    @CacheEvict(cacheNames = CacheConstants.TRENDZ_SETTINGS_CACHE, key = "#tenantId")
+    @Override
+    public void deleteTrendzSettings(TenantId tenantId) {
+        adminSettingsService.deleteAdminSettingsByTenantIdAndKey(tenantId, SETTINGS_KEY);
+    }
+
 }