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BlueLaminate/BlueLaminate.EFCore/Entities/SkinSweep.cs

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+namespace BlueLaminate.EFCore.Entities;
+
+/// <summary>
+/// One site's "last swept" checkpoint for a whole skin — used only for skins with no
+/// wear bands (e.g. vanilla knives), which are swept as a single unit. The per-band
+/// equivalent is <see cref="SkinConditionSweep"/>. Keyed by <c>(SkinId, Source)</c> so
+/// each marketplace tracks its own progress independently.
+/// </summary>
+public class SkinSweep
+{
+    public int Id { get; set; }
+
+    public int SkinId { get; set; }
+    public Skin Skin { get; set; } = null!;
+
+    /// <summary>Which site swept it — a <see cref="SweepSource"/> value.</summary>
+    public string Source { get; set; } = null!;
+
+    public DateTimeOffset SweptAt { get; set; }
+}