diff --git a/blog-api/config/environments/test/params.php b/blog-api/config/environments/test/params.php
index a8757bdd..abcc1796 100644
--- a/blog-api/config/environments/test/params.php
+++ b/blog-api/config/environments/test/params.php
@@ -10,7 +10,6 @@
         'enabled' => false,
     ],
     'yiisoft/yii-cycle' => [
-        // DBAL config
         'dbal' => [
             'connections' => [
                 'sqlite' => new SQLiteDriverConfig(
diff --git a/blog-api/src/Auth/AuthController.php b/blog-api/src/Auth/AuthController.php
index de3a7924..9416937c 100644
--- a/blog-api/src/Auth/AuthController.php
+++ b/blog-api/src/Auth/AuthController.php
@@ -14,15 +14,10 @@
 #[OA\SecurityScheme(securityScheme: 'ApiKey', type: 'apiKey', name: 'X-Api-Key', in: 'header')]
 final class AuthController
 {
-    private ResponseFactory $responseFactory;
-    private UserService $userService;
-
     public function __construct(
-        ResponseFactory $responseFactory,
-        UserService $userService
+        private ResponseFactory $responseFactory,
+        private UserService $userService,
     ) {
-        $this->responseFactory = $responseFactory;
-        $this->userService = $userService;
     }
 
     #[OA\Post(
diff --git a/blog-api/src/User/UserRepository.php b/blog-api/src/User/UserRepository.php
index acd5d750..b6ad8078 100644
--- a/blog-api/src/User/UserRepository.php
+++ b/blog-api/src/User/UserRepository.php
@@ -6,20 +6,21 @@
 
 use Cycle\ORM\ORMInterface;
 use Cycle\ORM\Select;
-use Cycle\ORM\Transaction;
 use Yiisoft\Auth\IdentityInterface;
 use Yiisoft\Auth\IdentityRepositoryInterface;
 use Yiisoft\Auth\IdentityWithTokenRepositoryInterface;
 use Yiisoft\Data\Cycle\Reader\EntityReader;
+use Yiisoft\Data\Cycle\Writer\EntityWriter;
 use Yiisoft\Data\Reader\Sort;
 
 final class UserRepository extends Select\Repository implements IdentityWithTokenRepositoryInterface, IdentityRepositoryInterface
 {
-    private ORMInterface $orm;
-
-    public function __construct(Select $select, ORMInterface $orm)
+    public function __construct(
+        Select $select,
+        private ORMInterface $orm,
+        private EntityWriter $entityWriter,
+    )
     {
-        $this->orm = $orm;
         parent::__construct($select);
     }
 
@@ -52,9 +53,7 @@ public function findByLogin(string $login): ?IdentityInterface
 
     public function save(IdentityInterface $user): void
     {
-        $transaction = new Transaction($this->orm);
-        $transaction->persist($user);
-        $transaction->run();
+        $this->entityWriter->write([$user]);
     }
 
     private function findIdentityBy(string $field, string $value): ?IdentityInterface
diff --git a/blog-api/src/User/UserService.php b/blog-api/src/User/UserService.php
index f5df91d5..b125d9e3 100644
--- a/blog-api/src/User/UserService.php
+++ b/blog-api/src/User/UserService.php
@@ -15,18 +15,11 @@
 
 final class UserService
 {
-    private IdentityRepositoryInterface $identityRepository;
-    private CurrentUser $currentUser;
-    private QueueFactoryInterface $queueFactory;
-
     public function __construct(
-        CurrentUser $currentUser,
-        IdentityRepositoryInterface $identityRepository,
-        QueueFactoryInterface $queueFactory
+        private CurrentUser $currentUser,
+        private IdentityRepositoryInterface $identityRepository,
+        private QueueFactoryInterface $queueFactory,
     ) {
-        $this->currentUser = $currentUser;
-        $this->identityRepository = $identityRepository;
-        $this->queueFactory = $queueFactory;
     }
 
     /**
@@ -40,7 +33,9 @@ public function __construct(
      */
     public function login(string $login, string $password): IdentityInterface
     {
-        $identity = $this->identityRepository->findByLogin($login);
+        /** @var UserRepository $identityRepository */
+        $identityRepository = $this->identityRepository;
+        $identity = $identityRepository->findByLogin($login);
         if ($identity === null) {
             throw new BadRequestException('No such user.');
         }
diff --git a/blog-api/tests/Acceptance/AuthCest.php b/blog-api/tests/Acceptance/AuthCest.php
index 9b674f59..2fe54ba8 100644
--- a/blog-api/tests/Acceptance/AuthCest.php
+++ b/blog-api/tests/Acceptance/AuthCest.php
@@ -12,7 +12,6 @@ final class AuthCest
 {
     public function testAuth(AcceptanceTester $I): void
     {
-        $I->haveHttpHeader('Content-Type', 'application/json');
         $I->sendPOST(
             '/auth/',
             [