almost ready

BlueLaminate/BlueLaminate.EFCore/Configurations/SkinSweepConfiguration.cs

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+using BlueLaminate.EFCore.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace BlueLaminate.EFCore.Configurations;
+
+public class SkinSweepConfiguration : IEntityTypeConfiguration<SkinSweep>
+{
+    public void Configure(EntityTypeBuilder<SkinSweep> entity)
+    {
+        // One checkpoint per skin per site: the natural key the upsert relies on.
+        entity.HasIndex(e => new { e.SkinId, e.Source }).IsUnique();
+
+        // Mirror SkinConditionSweep: index the (source, swept_at) ordering each sweep scans.
+        entity.HasIndex(e => new { e.Source, e.SweptAt });
+
+        entity.HasOne(e => e.Skin)
+            .WithMany(s => s.Sweeps)
+            .HasForeignKey(e => e.SkinId)
+            .OnDelete(DeleteBehavior.Cascade);
+    }
+}