Models: Add Entities/ folder

Elwig/Models/Entities/DeliveryPartModifier.cs

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+using Microsoft.EntityFrameworkCore;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Elwig.Models.Entities {
+    [Table("delivery_part_modifier"), PrimaryKey("Year", "DId", "DPNr", "ModId")]
+    public class DeliveryPartModifier {
+        [Column("year")]
+        public int Year { get; set; }
+
+        [Column("did")]
+        public int DId { get; set; }
+
+        [Column("dpnr")]
+        public int DPNr { get; set; }
+
+        [ForeignKey("Year, DId, DPNr")]
+        public virtual DeliveryPart Part { get; private set; }
+
+        [Column("modid")]
+        public string ModId { get; set; }
+
+        [ForeignKey("Year, ModId")]
+        public virtual Modifier Modifier { get; private set; }
+    }
+}