Started to increase the phpstan level

src/Entity/UserSystem/Group.php

@@ -37,6 +37,8 @@ use Symfony\Component\Validator\Constraints as Assert;
 
 /**
  * This entity represents a user group.
+ *
+ * @extends AbstractStructuralDBElement<GroupAttachment, GroupParameter>
  */
 #[ORM\Entity]
 #[ORM\Table('`groups`')]
@@ -45,9 +47,6 @@ use Symfony\Component\Validator\Constraints as Assert;
 #[NoLockout()]
 class Group extends AbstractStructuralDBElement implements HasPermissionsInterface
 {
-    /**
-     * @var Collection<int, self>
-     */
     #[ORM\OneToMany(targetEntity: 'Group', mappedBy: 'parent')]
     #[ORM\OrderBy(['name' => 'ASC'])]
     protected Collection $children;

src/Entity/UserSystem/User.php

@@ -59,6 +59,8 @@ use Jbtronics\TFAWebauthn\Model\TwoFactorInterface as WebauthnTwoFactorInterface
  * This entity represents a user, which can log in and have permissions.
  * Also, this entity is able to save some information about the user, like the names, email-address and other info.
  * @see \App\Tests\Entity\UserSystem\UserTest
+ *
+ * @extends AttachmentContainingDBElement<UserAttachment>
  */
 #[UniqueEntity('name', message: 'validator.user.username_already_used')]
 #[ORM\Entity(repositoryClass: UserRepository::class)]