yep

Gameboard.ShogiUI.Sockets/Repositories/CouchModels/UserDocument.cs

@@ -1,9 +1,9 @@
-namespace Gameboard.ShogiUI.Sockets.Repositories.CouchModels
+using System;
+
+namespace Gameboard.ShogiUI.Sockets.Repositories.CouchModels
 {
   public class UserDocument : CouchDocument
   {
-    public static string GetDocumentId(string userName) => $"org.couchdb.user:{userName}";
-
     public enum LoginPlatform
     {
       Microsoft,
@@ -12,10 +12,27 @@
 
     public string Name { get; set; }
     public LoginPlatform Platform { get; set; }
-    public UserDocument(string name, LoginPlatform platform) : base($"org.couchdb.user:{name}", WhichDocumentType.User)
+    /// <summary>
+    /// The browser session ID saved via Set-Cookie headers.
+    /// Only used with guest accounts.
+    /// </summary>
+    public Guid? WebSessionId { get; set; }
+
+    /// <summary>
+    /// Constructor for JSON deserializing.
+    /// </summary>
+    public UserDocument() : base(WhichDocumentType.User)
+    {
+      Name = string.Empty;
+    }
+
+    public UserDocument(string name, Guid? webSessionId = null) : base($"org.couchdb.user:{name}", WhichDocumentType.User)
     {
       Name = name;
-      Platform = platform;
+      WebSessionId = webSessionId;
+      Platform = WebSessionId.HasValue
+        ? LoginPlatform.Guest
+        : LoginPlatform.Microsoft;
     }
   }
 }