DTOs for index mostly done, doing DB models

SVSim.EmulatedEntrypoint/Models/Dtos/Internal/DataHeaders.cs

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+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Internal;
+
+[MessagePackObject]
+public class DataHeaders
+{
+    [Key("short_udid")]
+    public ulong ShortUdid { get; set; }
+    [Key("viewer_id")]
+    public ulong ViewerId { get; set; }
+    [Key("sid")]
+    public string Sid { get; set; }
+    [Key("servertime")]
+    public long Servertime { get; set; }
+    [Key("result_code")]
+    public int ResultCode { get; set; }
+}

SVSim.EmulatedEntrypoint/Models/Dtos/Internal/DataWrapper.cs

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+using MessagePack;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos.Internal;
+
+/// <summary>
+/// Wraps responses in the format the official game client expects, with a header section for additional data. Not for manual endpoint use, this wrapping is done automatically in a middleware.
+/// </summary>
+[MessagePackObject]
+public class DataWrapper
+{
+    /// <summary>
+    /// Additional data about the request, response and user.
+    /// </summary>
+    [Key("data_headers")] 
+    public DataHeaders DataHeaders { get; set; } = new DataHeaders();
+
+    /// <summary>
+    /// The response data from the endpoint.
+    /// </summary>
+    [Key("data")] 
+    public object Data { get; set; } = new();
+}