/*
         * We need to append a TOMBSTONE before the onpage value if the onpage value has a valid
         * stop pair.
         *
         * Imagine a case we insert and delete a value respectively at timestamp 0 and 10, and later
         * insert it again at 20. We need the TOMBSTONE to tell us there is no value between 10 and
         * 20.
         */
        if (unpack->stop_ts != WT_TS_MAX || unpack->stop_txn != WT_TXN_MAX) {
            /* Timestamp should always be in descending order */
            WT_ASSERT(session, upd->start_ts >= unpack->stop_ts);

            WT_ERR(__wt_update_alloc(session, NULL, &tombstone, &size, WT_UPDATE_TOMBSTONE));
            tombstone->txnid = unpack->stop_txn;
            tombstone->start_ts = unpack->stop_ts;
            tombstone->durable_ts = unpack->stop_ts;
            tombstone->next = append;
            total_size += size;
        }