public KnowledgeGraphEntityTypeDescription( 
   string name
)

await QueuedTask.Run(() =>
{
  using (var kg = GetKnowledgeGraph())
  {
    if (kg == null)
      return;

    var entity_name = "PhoneCall";
    var relate_name = "WhoCalledWho";

    var entityDesc = new KnowledgeGraphEntityTypeDescription(entity_name);
    var relateDesc = new KnowledgeGraphRelationshipTypeDescription(relate_name);

    //Run the schema builder
    try
    {
      SchemaBuilder sb = new(kg);
      sb.Delete(entityDesc);
      sb.Delete(relateDesc);
      //Use the KnowledgeGraph extension method 'ApplySchemaEdits(...)'
      //to refresh the Pro UI
      if (!kg.ApplySchemaEdits(sb))
      {
        var err_msg = string.Join(",", sb.ErrorMessages.ToArray());
        System.Diagnostics.Debug.WriteLine($"Entity/Relate Delete error: {err_msg}");
      }
    }
    catch (Exception ex)
    {
      System.Diagnostics.Debug.WriteLine(ex.ToString());
    }
  }
});