initial commit

backend/Infrastructure/Data/Configurations/AmsUnitConfiguration.cs

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+using Extrudex.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace Extrudex.Infrastructure.Data.Configurations;
+
+public class AmsUnitConfiguration : BaseEntityConfiguration<AmsUnit>
+{
+    public override void Configure(EntityTypeBuilder<AmsUnit> builder)
+    {
+        base.Configure(builder);
+
+        builder.Property(e => e.UnitIndex)
+            .HasColumnName("unit_index")
+            .IsRequired();
+
+        builder.Property(e => e.PrinterId)
+            .HasColumnName("printer_id")
+            .IsRequired();
+
+        // Unique index on (printer_id, unit_index) — no two units on the same printer share an index
+        builder.HasIndex(e => new { e.PrinterId, e.UnitIndex })
+            .IsUnique()
+            .HasDatabaseName("ix_ams_units_printer_id_unit_index");
+
+        // Relationships
+        builder.HasOne(e => e.Printer)
+            .WithMany(e => e.AmsUnits)
+            .HasForeignKey(e => e.PrinterId)
+            .HasConstraintName("fk_ams_units_printer")
+            .OnDelete(DeleteBehavior.Cascade);
+
+        builder.HasMany(e => e.Slots)
+            .WithOne(e => e.AmsUnit)
+            .HasForeignKey(e => e.AmsUnitId)
+            .HasConstraintName("fk_ams_slots_ams_unit");
+    }
+}