diff --git a/src/Repository/UserRepository.php b/src/Repository/UserRepository.php
index 11fe76a..35906e9 100644
--- a/src/Repository/UserRepository.php
+++ b/src/Repository/UserRepository.php
@@ -6,8 +6,8 @@ use App\Entity\User;
 use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
 use Doctrine\Persistence\ManagerRegistry;
 use Symfony\Component\Security\Core\Exception\UnsupportedUserException;
+use Symfony\Component\Security\Core\User\PasswordAuthenticatedUserInterface;
 use Symfony\Component\Security\Core\User\PasswordUpgraderInterface;
-use Symfony\Component\Security\Core\User\UserInterface;
 use function get_class;
 
 /**
@@ -20,20 +20,40 @@ class UserRepository extends ServiceEntityRepository implements PasswordUpgrader
 {
     public function __construct(ManagerRegistry $registry)
     {
-        parent::__construct($registry, User::class);
+        parent::__construct(registry: $registry, entityClass: User::class);
+    }
+
+    /**
+     */
+    public function add(User $entity, bool $flush = true): void
+    {
+        $this->_em->persist(entity: $entity);
+        if ($flush) {
+            $this->_em->flush();
+        }
+    }
+
+    /**
+     */
+    public function remove(User $entity, bool $flush = true): void
+    {
+        $this->_em->remove(entity: $entity);
+        if ($flush) {
+            $this->_em->flush();
+        }
     }
 
     /**
      * Used to upgrade (rehash) the user's password automatically over time.
      */
-    public function upgradePassword(UserInterface $user, string $newHashedPassword): void
+    public function upgradePassword(PasswordAuthenticatedUserInterface $user, string $newHashedPassword): void
     {
         if (!$user instanceof User) {
-            throw new UnsupportedUserException(sprintf('Instances of "%s" are not supported.', get_class($user)));
+            throw new UnsupportedUserException(message: sprintf('Instances of "%s" are not supported.', get_class(object: $user)));
         }
 
-        $user->setPassword($newHashedPassword);
-        $this->_em->persist($user);
+        $user->setPassword(password: $newHashedPassword);
+        $this->_em->persist(entity: $user);
         $this->_em->flush();
     }