Adding

LCU.API.Internal.MemberPreferencesApi/LCU.Library.Internal.MemberPreferencesApiModels/Models/Auditable.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Text.Json.Serialization;
+using LCU.Library.Internal.MemberPreferencesApiModels.Enums;
+
+namespace LCU.Library.Internal.MemberPreferencesApiModels.Models;
+
+public abstract class Auditable
+{
+    public string CreatedBy { get; set; }
+    public DateTime Created { get; set; }
+    [JsonConverter(typeof(JsonStringEnumConverter))]
+    public UserType CreatedByType { get; set; }
+    public string LastUpdatedBy { get; set; }
+    public DateTime LastUpdated { get; set; }
+    [JsonConverter(typeof(JsonStringEnumConverter))]
+    public UserType LastUpdatedByType { get; set; }
+}

LCU.API.Internal.MemberPreferencesApi/LCU.Library.Internal.MemberPreferencesApiModels/Models/IAuditableChanges.cs

@@ -0,0 +1,6 @@
+namespace LCU.Library.Internal.MemberPreferencesApiModels.Models;
+
+public interface IAuditableChanges
+{
+    void SystemModified(Auditable entity, string modifiedBy);
+}