@Beta
    public void setPersistedTimestamp(long time) {
        this.persistedTimestamp = time;
    }
<p>Set the timestamp of the last known tombstone for this document.</p>

<p>This is normally only invoked by the backends as part of visiting.</p>
documentapi/src/main/java/com/yahoo/documentapi/messagebus/protocol/RemoveDocumentMessage.java