// Test timestamp
        ZonedDateTime now = ZonedDateTime.now();
        item.setTimestamp(now);
        assertEquals(now, item.getTimestamp());

        // Test query frequency
        item.setQueryFreq(200L);
        assertEquals(200L, item.getQueryFreq());

        // Test document frequency
        item.setDocFreq(150L);
        assertEquals(150L, item.getDocFreq());

        // Test user boost