diff --git a/Admin/Install/Navigation.php b/Admin/Install/Navigation.php
index 3ea3b3a..cfbc54a 100644
--- a/Admin/Install/Navigation.php
+++ b/Admin/Install/Navigation.php
@@ -36,7 +36,7 @@ class Navigation
      *
      * @since  1.0.0
      */
-    public static function install(string $path = null, DatabasePool $dbPool = null) : void
+    public static function install(string $path, DatabasePool $dbPool) : void
     {
         \Modules\Navigation\Admin\Installer::installExternal($dbPool, ['path' => __DIR__ . '/Navigation.install.json']);
     }
diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index 38e1d33..9062383 100644
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -14,6 +14,7 @@ declare(strict_types=1);
 
 namespace Modules\HumanResourceTimeRecording\Controller;
 
+use phpOMS\Contract\RenderableInterface;
 use phpOMS\Message\RequestAbstract;
 use phpOMS\Message\ResponseAbstract;
 use phpOMS\Views\View;
@@ -34,12 +35,12 @@ final class BackendController extends Controller
      * @param ResponseAbstract $response Response
      * @param mixed            $data     Generic data
      *
-     * @return \Serializable
+     * @return RenderableInterface
      *
      * @since  1.0.0
      * @codeCoverageIgnore
      */
-    public function viewDatabaseList(RequestAbstract $request, ResponseAbstract $response, $data = null) : \Serializable
+    public function viewDatabaseList(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
     {
         $view = new View($this->app, $request, $response);
         $view->setTemplate('/Modules/Database/Theme/Backend/database-list');
@@ -53,12 +54,12 @@ final class BackendController extends Controller
      * @param ResponseAbstract $response Response
      * @param mixed            $data     Generic data
      *
-     * @return \Serializable
+     * @return RenderableInterface
      *
      * @since  1.0.0
      * @codeCoverageIgnore
      */
-    public function viewDatabaseCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : \Serializable
+    public function viewDatabaseCreate(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
     {
         $view = new View($this->app, $request, $response);
         $view->setTemplate('/Modules/Database/Theme/Backend/database-generator');
@@ -72,12 +73,12 @@ final class BackendController extends Controller
      * @param ResponseAbstract $response Response
      * @param mixed            $data     Generic data
      *
-     * @return \Serializable
+     * @return RenderableInterface
      *
      * @since  1.0.0
      * @codeCoverageIgnore
      */
-    public function viewDatabaseResult(RequestAbstract $request, ResponseAbstract $response, $data = null) : \Serializable
+    public function viewDatabaseResult(RequestAbstract $request, ResponseAbstract $response, $data = null) : RenderableInterface
     {
         $view = new View($this->app, $request, $response);
         $view->setTemplate('/Modules/Database/Theme/Backend/database-query-result');