adding validation annotation and changing db scheme according to last feedback

server/web_app/src/Controller/ItemController.php

server/web_app/src/DataFixtures/ItemFixtures.php

server/web_app/src/DataFixtures/WishListFixtures.php

server/web_app/src/Entity/Item.php

server/web_app/src/Entity/Purchase.php

server/web_app/src/Entity/User.php

server/web_app/src/Entity/WishList.php

server/web_app/src/Entity/WishListMember.php

server/web_app/src/Enum/UserRole.php

server/web_app/src/Repository/ItemRepository.php