diff --git a/.env b/.env
index 1ef7e5c..580cf9c 100644
--- a/.env
+++ b/.env
@@ -20,5 +20,5 @@ APP_SECRET=
 ###< symfony/framework-bundle ###
 
 DATABASE_HOSTNAME=localhost
-DATABASE_USER=user
-DATABASE_PASSWORD=password
\ No newline at end of file
+DATABASE_USER=admin
+DATABASE_PASSWORD=admin
\ No newline at end of file
diff --git a/config/services.yaml b/config/services.yaml
index 28f9639..2d6a76f 100644
--- a/config/services.yaml
+++ b/config/services.yaml
@@ -22,9 +22,3 @@ services:
 
     # add more service definitions when explicit configuration is needed
     # please note that last definitions always *replace* previous ones
-
-    App\Service\DatabaseCredentials:
-        arguments:
-            $hostname: '%env(string:DATABASE_HOSTNAME)%'
-            $user: '%env(string:DATABASE_USER)%'
-            $password: '%env(DATABASE_PASSWORD)%'
\ No newline at end of file
diff --git a/src/Service/BackupService.php b/src/Service/BackupService.php
index f6667bc..1e4de21 100644
--- a/src/Service/BackupService.php
+++ b/src/Service/BackupService.php
@@ -4,10 +4,13 @@ namespace App\Service;
 
 use Symfony\Component\Process\Process;
 
-class BackupService
+readonly class BackupService
 {
+    private const COMMAND_DUMP = 'mariadb-dump';
+    private const COMMAND_DB = 'mariadb';
+
     public function __construct(
-        private readonly DatabaseCredentials $credentials
+        private DatabaseCredentials $credentials
     ) {}
 
     public function backup(string $db, ?string $fileName = null): string
@@ -18,11 +21,11 @@ class BackupService
         }
 
         $process = new Process([
-            'mysqldump',
-            '-u', $this->credentials->getUser(),
+            self::COMMAND_DUMP,
+            '-u', $this->credentials->user,
             $db,
         ]);
-        $process->setEnv(['MYSQL_PWD' => $this->credentials->getPassword()]);
+        $process->setEnv(['MYSQL_PWD' => $this->credentials->password]);
         $process->start();
 
         $stream = fopen($fileName, 'w+');
@@ -40,14 +43,14 @@ class BackupService
     public function restore(string $db, string $fileName): void
     {
         $process = new Process([
-            'mysql',
-            '-u', $this->credentials->getUser(),
+            self::COMMAND_DB,
+            '-u', $this->credentials->user,
             $db,
         ]);
 
         $stream = fopen($fileName, 'r');
 
-        $process->setEnv(['MYSQL_PWD' => $this->credentials->getPassword()]);
+        $process->setEnv(['MYSQL_PWD' => $this->credentials->password]);
         $process->setInput($stream);
         $process->run();
     }
diff --git a/src/Service/DatabaseCredentials.php b/src/Service/DatabaseCredentials.php
index cf069d9..7978756 100644
--- a/src/Service/DatabaseCredentials.php
+++ b/src/Service/DatabaseCredentials.php
@@ -2,26 +2,13 @@
 
 namespace App\Service;
 
-class DatabaseCredentials
+use Symfony\Component\DependencyInjection\Attribute\Autowire;
+
+readonly class DatabaseCredentials
 {
     public function __construct(
-        private readonly string $hostname,
-        private readonly string $user,
-        private readonly string $password,
+        #[Autowire('%env(string:DATABASE_HOSTNAME)%')] public string $hostname,
+        #[Autowire('%env(string:DATABASE_USER)%')] public string $user,
+        #[Autowire('%env(string:DATABASE_PASSWORD)%')] public string $password,
     ) {}
-
-    public function getHostname(): string
-    {
-        return $this->hostname;
-    }
-
-    public function getUser(): string
-    {
-        return $this->user;
-    }
-
-    public function getPassword(): string
-    {
-        return $this->password;
-    }
 }
\ No newline at end of file
diff --git a/src/Service/DatabaseService.php b/src/Service/DatabaseService.php
index 7dfebbd..f9e4e72 100644
--- a/src/Service/DatabaseService.php
+++ b/src/Service/DatabaseService.php
@@ -5,15 +5,12 @@ namespace App\Service;
 use Exception;
 use mysqli;
 
-class DatabaseService
+readonly class DatabaseService
 {
-    private mysqli $conn;
-
     public function __construct(
-        private readonly MysqliConnection $service
+        private MysqliConnection $conn
     )
     {
-        $this->conn = $this->service->getConnection();
     }
 
     public function listDatabases(): array
diff --git a/src/Service/MysqliConnection.php b/src/Service/MysqliConnection.php
index ba763ce..ab15654 100644
--- a/src/Service/MysqliConnection.php
+++ b/src/Service/MysqliConnection.php
@@ -5,20 +5,13 @@ namespace App\Service;
 use Exception;
 use mysqli;
 
-class MysqliConnection
+class MysqliConnection extends mysqli
 {
-    private mysqli $connection;
-
     public function __construct(DatabaseCredentials $credentials)
     {
-        $this->connection = new mysqli($credentials->getHostname(), $credentials->getUser(), $credentials->getPassword());
-        if ($this->connection->connect_error) {
-            throw new Exception("Connection failed: " . $this->connection->connect_error);
+        parent::__construct($credentials->hostname, $credentials->user, $credentials->password);
+        if ($this->connect_error) {
+            throw new Exception("Connection failed: " . $this->connect_error);
         }
     }
-
-    public function getConnection(): mysqli
-    {
-        return $this->connection;
-    }
 }
\ No newline at end of file