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BlueLaminate/BlueLaminate.EFCore/Configurations/SkinConditionSweepConfiguration.cs

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+using BlueLaminate.EFCore.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace BlueLaminate.EFCore.Configurations;
+
+public class SkinConditionSweepConfiguration : IEntityTypeConfiguration<SkinConditionSweep>
+{
+    public void Configure(EntityTypeBuilder<SkinConditionSweep> entity)
+    {
+        // One checkpoint per band per site: the natural key, and what the upsert
+        // ("stamp") in SweepCheckpoints relies on.
+        entity.HasIndex(e => new { e.SkinConditionId, e.Source }).IsUnique();
+
+        // Each site's sweep orders its bands never-swept-first then stalest; index the
+        // ordering it scans (filter by source, sort by swept_at).
+        entity.HasIndex(e => new { e.Source, e.SweptAt });
+
+        entity.HasOne(e => e.SkinCondition)
+            .WithMany(c => c.Sweeps)
+            .HasForeignKey(e => e.SkinConditionId)
+            .OnDelete(DeleteBehavior.Cascade);
+    }
+}