Fix user cache key evaluation without parameter metadata

Author: thughari

backend/src/main/java/com/thughari/jobtrackerpro/repo/UserRepository.java

@@ -17,7 +17,7 @@
 
 public interface UserRepository extends JpaRepository<User, UUID> {
 
-	@Cacheable(value = "userEntities", key = "#email")
+	@Cacheable(value = "userEntities", key = "#root.args[0]")
 	Optional<User> findByEmail(String email);
 
 	@Modifying