Add pricing and supplier master data

Distribution/Models/PriceList.cs

@@ -0,0 +1,18 @@
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Distribution.Models
+{
+    public class PriceList : Template
+    {
+        public string Name { get; set; }
+
+        public Guid? FK_RegionId { get; set; }
+        [ForeignKey("FK_RegionId")]
+        public Region? Region { get; set; }
+
+        public DateTime EffectiveFrom { get; set; }
+        public DateTime EffectiveTo { get; set; }
+
+        public ICollection<PriceListItem> Items { get; set; } = [];
+    }
+}