DTOs for index mostly done, doing DB models

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

@@ -0,0 +1,18 @@
+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; }
+}