initial commit

backend/Infrastructure/Data/Configurations/AmsSlotConfiguration.cs

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+using Extrudex.Domain.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace Extrudex.Infrastructure.Data.Configurations;
+
+public class AmsSlotConfiguration : BaseEntityConfiguration<AmsSlot>
+{
+    public override void Configure(EntityTypeBuilder<AmsSlot> builder)
+    {
+        base.Configure(builder);
+
+        builder.Property(e => e.TrayIndex)
+            .HasColumnName("tray_index")
+            .IsRequired();
+
+        builder.Property(e => e.AmsUnitId)
+            .HasColumnName("ams_unit_id")
+            .IsRequired();
+
+        builder.Property(e => e.SpoolId)
+            .HasColumnName("spool_id");
+
+        builder.Property(e => e.RemainingWeightG)
+            .HasColumnName("remaining_weight_g")
+            .HasPrecision(10, 2);
+
+        // Unique index on (ams_unit_id, tray_index) — each slot position is unique within its unit
+        builder.HasIndex(e => new { e.AmsUnitId, e.TrayIndex })
+            .IsUnique()
+            .HasDatabaseName("ix_ams_slots_ams_unit_id_tray_index");
+
+        // Index on spool_id for looking up which slot holds a given spool
+        builder.HasIndex(e => e.SpoolId)
+            .HasDatabaseName("ix_ams_slots_spool_id");
+
+        // Relationships
+        builder.HasOne(e => e.AmsUnit)
+            .WithMany(e => e.Slots)
+            .HasForeignKey(e => e.AmsUnitId)
+            .HasConstraintName("fk_ams_slots_ams_unit")
+            .OnDelete(DeleteBehavior.Cascade);
+
+        builder.HasOne(e => e.Spool)
+            .WithMany(e => e.AmsSlots)
+            .HasForeignKey(e => e.SpoolId)
+            .HasConstraintName("fk_ams_slots_spool")
+            .OnDelete(DeleteBehavior.SetNull);
+    }
+}