feat(apiv2): database changes

PluralKit.Core/Models/PKMember.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Linq;
 
@@ -39,6 +40,7 @@ namespace PluralKit.Core
         // when trying to map to *subclasses* (eg. ListedMember). Adding private setters makes it work anyway.
         public MemberId Id { get; private set; }
         public string Hid { get; private set; }
+        public Guid Uuid { get; private set; }
         public SystemId System { get; private set; }
         public string Color { get; private set; }
         public string AvatarUrl { get; private set; }