initial commit

backend/Infrastructure/Data/Configurations/MaterialFinishConfiguration.cs

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+using Extrudex.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace Extrudex.Infrastructure.Data.Configurations;
+
+public class MaterialFinishConfiguration : BaseEntityConfiguration<MaterialFinish>
+{
+    public override void Configure(EntityTypeBuilder<MaterialFinish> builder)
+    {
+        base.Configure(builder);
+
+        builder.Property(e => e.Name)
+            .HasColumnName("name")
+            .IsRequired()
+            .HasMaxLength(100);
+
+        builder.Property(e => e.MaterialBaseId)
+            .HasColumnName("material_base_id")
+            .IsRequired();
+
+        // Unique index on (material_base_id, name) — each finish name is unique per base material
+        builder.HasIndex(e => new { e.MaterialBaseId, e.Name })
+            .IsUnique()
+            .HasDatabaseName("ix_material_finishes_material_base_id_name");
+
+        // Relationship configured from MaterialBase side; navigation-only here
+        builder.HasOne(e => e.MaterialBase)
+            .WithMany(e => e.Finishes)
+            .HasForeignKey(e => e.MaterialBaseId)
+            .HasConstraintName("fk_material_finishes_material_base")
+            .OnDelete(DeleteBehavior.Restrict);
+
+        builder.HasMany(e => e.Spools)
+            .WithOne(e => e.MaterialFinish)
+            .HasForeignKey(e => e.MaterialFinishId)
+            .HasConstraintName("fk_spools_material_finish");
+    }
+}