Things were working, suddenly regressed

SVSim.EmulatedEntrypoint/Models/Dtos/UserMyPageInfo.cs

@@ -0,0 +1,37 @@
+using MessagePack;
+using System.Text.Json.Serialization;
+
+namespace SVSim.EmulatedEntrypoint.Models.Dtos;
+
+/// <summary>
+/// user_mypage_info — wrapper around the active home-screen background
+/// configuration. Client constructs MyPageBGInfo(user_mypage_setting) at
+/// MyPageTask.cs:176.
+/// </summary>
+[MessagePackObject]
+public class UserMyPageInfo
+{
+    [JsonPropertyName("user_mypage_setting")]
+    [Key("user_mypage_setting")]
+    public MyPageBgSetting UserMyPageSetting { get; set; } = new();
+}
+
+/// <summary>
+/// Active mypage background selection. Shape from prod 2026-05-23.
+/// </summary>
+[MessagePackObject]
+public class MyPageBgSetting
+{
+    [JsonPropertyName("mypage_id")]
+    [Key("mypage_id")]
+    public int MyPageId { get; set; }
+
+    /// <summary>0 = single selection (mypage_id), 1+ = random rotation across mypage_id_list.</summary>
+    [JsonPropertyName("select_type")]
+    [Key("select_type")]
+    public int SelectType { get; set; }
+
+    [JsonPropertyName("mypage_id_list")]
+    [Key("mypage_id_list")]
+    public List<int> MyPageIdList { get; set; } = new();
+}