feat(dal): в таблице Order поле Number уникальное

PARR.DAL/Migrations/20240215064401_tblOrdersNamberIsUnique.cs

@@ -0,0 +1,28 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace PARR.DAL.Migrations
+{
+    /// <inheritdoc />
+    public partial class tblOrdersNamberIsUnique : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateIndex(
+                name: "IX_Orders_Number",
+                table: "Orders",
+                column: "Number",
+                unique: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropIndex(
+                name: "IX_Orders_Number",
+                table: "Orders");
+        }
+    }
+}