diff --git a/app/.htaccess b/app/.htaccess
deleted file mode 100644
index fb1de45bd..000000000
--- a/app/.htaccess
+++ /dev/null
@@ -1,7 +0,0 @@
-<IfModule mod_authz_core.c>
-    Require all denied
-</IfModule>
-<IfModule !mod_authz_core.c>
-    Order deny,allow
-    Deny from all
-</IfModule>
diff --git a/app/AppCache.php b/app/AppCache.php
deleted file mode 100644
index 639ec2cd7..000000000
--- a/app/AppCache.php
+++ /dev/null
@@ -1,7 +0,0 @@
-<?php
-
-use Symfony\Bundle\FrameworkBundle\HttpCache\HttpCache;
-
-class AppCache extends HttpCache
-{
-}
diff --git a/app/AppKernel.php b/app/AppKernel.php
deleted file mode 100644
index 812f778fa..000000000
--- a/app/AppKernel.php
+++ /dev/null
@@ -1,106 +0,0 @@
-<?php
-
-use Symfony\Component\Config\Loader\LoaderInterface;
-use Symfony\Component\DependencyInjection\ContainerBuilder;
-use Symfony\Component\HttpKernel\Kernel;
-
-class AppKernel extends Kernel
-{
-    public function registerBundles()
-    {
-        $bundles = [
-            new Symfony\Bundle\FrameworkBundle\FrameworkBundle(),
-            new Symfony\Bundle\SecurityBundle\SecurityBundle(),
-            new Symfony\Bundle\TwigBundle\TwigBundle(),
-            new Symfony\Bundle\MonologBundle\MonologBundle(),
-            new Doctrine\Bundle\DoctrineBundle\DoctrineBundle(),
-            new Sensio\Bundle\FrameworkExtraBundle\SensioFrameworkExtraBundle(),
-            new FOS\RestBundle\FOSRestBundle(),
-            new FOS\UserBundle\FOSUserBundle(),
-            new JMS\SerializerBundle\JMSSerializerBundle(),
-            new Nelmio\ApiDocBundle\NelmioApiDocBundle(),
-            new Nelmio\CorsBundle\NelmioCorsBundle(),
-            new Bazinga\Bundle\HateoasBundle\BazingaHateoasBundle(),
-            new Lexik\Bundle\FormFilterBundle\LexikFormFilterBundle(),
-            new FOS\OAuthServerBundle\FOSOAuthServerBundle(),
-            new Stof\DoctrineExtensionsBundle\StofDoctrineExtensionsBundle(),
-            new Scheb\TwoFactorBundle\SchebTwoFactorBundle(),
-            new KPhoen\RulerZBundle\KPhoenRulerZBundle(),
-            new Doctrine\Bundle\MigrationsBundle\DoctrineMigrationsBundle(),
-            new Craue\ConfigBundle\CraueConfigBundle(),
-            new BabDev\PagerfantaBundle\BabDevPagerfantaBundle(),
-            new FOS\JsRoutingBundle\FOSJsRoutingBundle(),
-            new BD\GuzzleSiteAuthenticatorBundle\BDGuzzleSiteAuthenticatorBundle(),
-            new OldSound\RabbitMqBundle\OldSoundRabbitMqBundle(),
-            new Http\HttplugBundle\HttplugBundle(),
-            new Sentry\SentryBundle\SentryBundle(),
-            new Twig\Extra\TwigExtraBundle\TwigExtraBundle(),
-
-            // wallabag bundles
-            new Wallabag\CoreBundle\WallabagCoreBundle(),
-            new Wallabag\ApiBundle\WallabagApiBundle(),
-            new Wallabag\UserBundle\WallabagUserBundle(),
-            new Wallabag\ImportBundle\WallabagImportBundle(),
-            new Wallabag\AnnotationBundle\WallabagAnnotationBundle(),
-        ];
-
-        if (in_array($this->getEnvironment(), ['dev', 'test'], true)) {
-            $bundles[] = new Symfony\Bundle\DebugBundle\DebugBundle();
-            $bundles[] = new Symfony\Bundle\WebProfilerBundle\WebProfilerBundle();
-            $bundles[] = new Doctrine\Bundle\FixturesBundle\DoctrineFixturesBundle();
-
-            if ('test' === $this->getEnvironment()) {
-                $bundles[] = new DAMA\DoctrineTestBundle\DAMADoctrineTestBundle();
-            }
-
-            if ('dev' === $this->getEnvironment()) {
-                $bundles[] = new Symfony\Bundle\MakerBundle\MakerBundle();
-                $bundles[] = new Symfony\Bundle\WebServerBundle\WebServerBundle();
-            }
-        }
-
-        return $bundles;
-    }
-
-    public function getRootDir()
-    {
-        return __DIR__;
-    }
-
-    public function getCacheDir()
-    {
-        return dirname(__DIR__) . '/var/cache/' . $this->getEnvironment();
-    }
-
-    public function getLogDir()
-    {
-        return dirname(__DIR__) . '/var/logs';
-    }
-
-    public function registerContainerConfiguration(LoaderInterface $loader)
-    {
-        $loader->load($this->getRootDir() . '/config/config_' . $this->getEnvironment() . '.yml');
-
-        $loader->load(function ($container) {
-            if ($container->getParameter('use_webpack_dev_server')) {
-                $container->loadFromExtension('framework', [
-                   'assets' => [
-                       'base_url' => 'http://localhost:8080/',
-                   ],
-               ]);
-            } else {
-                $container->loadFromExtension('framework', [
-                    'assets' => [
-                        'base_url' => $container->getParameter('domain_name'),
-                    ],
-                ]);
-            }
-        });
-
-        $loader->load(function (ContainerBuilder $container) {
-            // $container->setParameter('container.autowiring.strict_mode', true);
-            // $container->setParameter('container.dumper.inline_class_loader', true);
-            $container->addObjectResource($this);
-        });
-    }
-}
diff --git a/app/config/parameters_test.yml b/app/config/parameters_test.yml
deleted file mode 100644
index 257d2acec..000000000
--- a/app/config/parameters_test.yml
+++ /dev/null
@@ -1,10 +0,0 @@
-parameters:
-    test_database_driver: pdo_sqlite
-    test_database_host: 127.0.0.1
-    test_database_port: null
-    test_database_name: null
-    test_database_user: null
-    test_database_password: null
-    test_database_path: "%env(TEST_DATABASE_PATH)%"
-    env(TEST_DATABASE_PATH): "%kernel.project_dir%/data/db/wallabag_test.sqlite"
-    test_database_charset: utf8
diff --git a/app/config/tests/parameters_test.mysql.yml b/app/config/tests/parameters_test.mysql.yml
deleted file mode 100644
index d07d09256..000000000
--- a/app/config/tests/parameters_test.mysql.yml
+++ /dev/null
@@ -1,10 +0,0 @@
-parameters:
-    test_database_driver: pdo_mysql
-    test_database_host: 127.0.0.1
-    test_database_port: 3306
-    test_database_name: wallabag_test
-    test_database_user: root
-    test_database_password: root
-    test_database_path: ~
-    env(TEST_DATABASE_PATH): ~
-    test_database_charset: utf8mb4
diff --git a/app/config/tests/parameters_test.pgsql.yml b/app/config/tests/parameters_test.pgsql.yml
deleted file mode 100644
index 2be37aa14..000000000
--- a/app/config/tests/parameters_test.pgsql.yml
+++ /dev/null
@@ -1,10 +0,0 @@
-parameters:
-    test_database_driver: pdo_pgsql
-    test_database_host: localhost
-    test_database_port:
-    test_database_name: wallabag_test
-    test_database_user: wallabag
-    test_database_password: wallabagrocks
-    test_database_path: ~
-    env(TEST_DATABASE_PATH): ~
-    test_database_charset: utf8
diff --git a/app/config/tests/parameters_test.sqlite.yml b/app/config/tests/parameters_test.sqlite.yml
deleted file mode 100644
index 2b92d579f..000000000
--- a/app/config/tests/parameters_test.sqlite.yml
+++ /dev/null
@@ -1,12 +0,0 @@
-parameters:
-    test_database_driver: pdo_sqlite
-    test_database_host: localhost
-    test_database_port:
-    test_database_name: ~
-    test_database_user: ~
-    test_database_password: ~
-    # Using an environnement variable in order to avoid the error "attempt to write a readonly database"
-    # when the schema is dropped then recreate
-    test_database_path: "%env(TEST_DATABASE_PATH)%"
-    env(TEST_DATABASE_PATH): "%kernel.project_dir%/data/db/wallabag_test.sqlite"
-    test_database_charset: utf8
diff --git a/migrations/Version20170606155640.php b/migrations/Version20170606155640.php
index 2b3990ccd..133e5d5e5 100644
--- a/migrations/Version20170606155640.php
+++ b/migrations/Version20170606155640.php
@@ -13,7 +13,7 @@ class Version20170606155640 extends WallabagMigration
 {
     public function up(Schema $schema): void
     {
-        $this->skipIf(!$schema->hasTable($this->getTable('craue_config_setting')), 'Table already renamed');
+        $this->skipIf(!$schema->hasTable($this->getTable('craue_config_setting')), 'Old migration (table name has changed)');
 
         $apiUserRegistration = $this->container
             ->get('doctrine.orm.default_entity_manager')
diff --git a/src/Entity/User.php b/src/Entity/User.php
index a51f3f074..8bc3b8515 100644
--- a/src/Entity/User.php
+++ b/src/Entity/User.php
@@ -172,7 +172,7 @@ class User extends BaseUser implements EmailTwoFactorInterface, GoogleTwoFactorI
      *
      * @ORM\Column(type="json", nullable=true)
      */
-    private $backupCodes;
+    private array $backupCodes;
 
     /**
      * @var bool