t; + VIRTUAL_GROUP_ID + &quot;\&quot;&quot;
&nbsp;        );
&nbsp;
&nbsp;        //Unique index, element can only appear once per virtual group parent
<b class="fc">&nbsp;        PropertyColumn cmUidPropertyColumn = virtualGroupRootRealWorkspaceElementVertexLabel.getProperty(cmUid).orElseThrow();</b>
<b class="fc">&nbsp;        virtualGroupRootRealWorkspaceElementVertexLabel.ensureIndexExists(IndexType.UNIQUE, Collections.singletonList(cmUidPropertyColumn));</b>
&nbsp;
<b class="fc">&nbsp;        this.sqlg