db constraint with unique remoteId if set, handle sync with tests

src/Bundle/ChillMainBundle/Repository/UserRepository.php

@@ -18,11 +18,10 @@ use Doctrine\ORM\EntityRepository;
 use Doctrine\ORM\Query\ResultSetMapping;
 use Doctrine\ORM\Query\ResultSetMappingBuilder;
 use Doctrine\ORM\QueryBuilder;
-use Doctrine\Persistence\ObjectRepository;
 
 use function count;
 
-final class UserRepository implements ObjectRepository
+final class UserRepository implements UserRepositoryInterface
 {
     private EntityManagerInterface $entityManager;
 
@@ -206,7 +205,7 @@ final class UserRepository implements ObjectRepository
         return $qb->getQuery()->getResult();
     }
 
-    public function getClassName()
+    public function getClassName(): string
     {
         return User::class;
     }