initial commit

backend/Infrastructure/Data/Configurations/MaterialBaseConfiguration.cs

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+using Extrudex.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace Extrudex.Infrastructure.Data.Configurations;
+
+public class MaterialBaseConfiguration : BaseEntityConfiguration<MaterialBase>
+{
+    public override void Configure(EntityTypeBuilder<MaterialBase> builder)
+    {
+        base.Configure(builder);
+
+        builder.Property(e => e.Name)
+            .HasColumnName("name")
+            .IsRequired()
+            .HasMaxLength(100);
+
+        builder.Property(e => e.DensityGperCm3)
+            .HasColumnName("density_g_per_cm3")
+            .HasPrecision(10, 4)
+            .IsRequired();
+
+        // Unique index on material base name
+        builder.HasIndex(e => e.Name)
+            .IsUnique()
+            .HasDatabaseName("ix_material_bases_name");
+
+        // Relationships
+        builder.HasMany(e => e.Finishes)
+            .WithOne(e => e.MaterialBase)
+            .HasForeignKey(e => e.MaterialBaseId)
+            .HasConstraintName("fk_material_finishes_material_base");
+
+        builder.HasMany(e => e.Modifiers)
+            .WithOne(e => e.MaterialBase)
+            .HasForeignKey(e => e.MaterialBaseId)
+            .HasConstraintName("fk_material_modifiers_material_base");
+
+        builder.HasMany(e => e.Spools)
+            .WithOne(e => e.MaterialBase)
+            .HasForeignKey(e => e.MaterialBaseId)
+            .HasConstraintName("fk_spools_material_base");
+    }
+}