val unregisteredPeople = jdbcTemplate.query(GET_ZUPPERS_NAME_AND_EMAIL, PeopleRowMapper())

        val peopleSynchronized = peopleRepository.findAll()
            .map { it.email }

        val peopleToBeSaved = unregisteredPeople
            .filter { !peopleSynchronized.contains(it.email) }
            .map {
                People(
                    name = it.name,
                    email = it.email
                )
            }