Deck list work

SVSim.Database/Models/PaymentItemEntry.cs

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+using SVSim.Database.Common;
+
+namespace SVSim.Database.Models;
+
+/// <summary>
+/// One row of the Steam/PC storefront item list from /payment_pc/item_list data. Singleton per
+/// product. Id is the wire's <c>record_id</c> (prod's auto-increment, genuinely stable across
+/// captures — same upsert-by-wire-id pattern as MasterPointRankingPeriodEntry, not the synthetic-
+/// ordinal Banner pattern).
+///
+/// All numeric fields land in typed columns; the controller stringifies them on the way out to
+/// match prod's PHP-stringified wire convention.
+/// </summary>
+public class PaymentItemEntry : BaseEntity<int>
+{
+    /// <summary>Internal product id (different from store_product_id). Used by the client at
+    /// PaymentItemListTask.cs:50,58,64,67 as a per-tier discriminator.</summary>
+    public int ProductId { get; set; }
+
+    /// <summary>User-visible SKU (e.g. 10011 for "60-crystal set"). Wire dict key.</summary>
+    public long StoreProductId { get; set; }
+
+    public string Name { get; set; } = string.Empty;
+
+    public string Text { get; set; } = string.Empty;
+
+    public decimal Price { get; set; }
+
+    public int ChargeCrystalNum { get; set; }
+
+    public int FreeCrystalNum { get; set; }
+
+    public int PurchaseLimit { get; set; }
+
+    /// <summary>0/1 — special_shop_flag on the wire (stringified).</summary>
+    public int SpecialShopFlag { get; set; }
+
+    public string ImageName { get; set; } = string.Empty;
+
+    public DateTime StartTime { get; set; }
+
+    public DateTime EndTime { get; set; }
+
+    public int RemainingTime { get; set; }
+
+    /// <summary>0/1 — is_resale_product on the wire (stringified).</summary>
+    public int IsResaleProduct { get; set; }
+
+    /// <summary>Nullable — prod sends empty string when unset; we store null and emit "".</summary>
+    public DateTime? ResaleStartDate { get; set; }
+}

SVSim.Database/Models/SpecialDeckFormatEntry.cs

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+using SVSim.Database.Common;
+
+namespace SVSim.Database.Models;
+
+/// <summary>
+/// One entry from /mypage/index data.room_type_in_session.special_deck_format_list. A list of deck-format
+/// codes that have a current "special" window (e.g. format "5" valid until 2030-06-26). Id is a synthetic
+/// ordinal — the wire has no explicit identifier, and ImportRoomTypeInSession follows the same clear-and-
+/// rewrite pattern as ImportBanners.
+/// </summary>
+public class SpecialDeckFormatEntry : BaseEntity<int>
+{
+    /// <summary>Wire is string per prod's PHP convention even though it looks numeric (e.g. "5").</summary>
+    public string DeckFormat { get; set; } = string.Empty;
+
+    public DateTime EndTime { get; set; }
+}