MS-113 "prevent duplicate open carts for the same client"

Closes MS-113

src/main/java/com/marketingconfort/mydressin/repositories/CartRepository.java

@@ -97,4 +97,7 @@ public interface CartRepository extends JpaRepository<Cart, Long>, JpaSpecificat
                                      @Param("clientId") Long clientId,
                                      @Param("status") Status status);
 
+    @Lock(LockModeType.PESSIMISTIC_WRITE)
+    List<Cart> findAllByClientIdAndStatus(Long clientId, Status status);
+
 }