public static HsConsumerId newId(@Nullable HsConsumerId lastId) {
        return lastId == null ? DEFAULT : new HsConsumerId(lastId.id + 1);
    }
@Test
    void testNewIdFromNull() {
        HsConsumerId consumerId = HsConsumerId.newId(null);
        assertThat(consumerId).isNotNull().isEqualTo(HsConsumerId.DEFAULT);
    }