Remove signed fields.

DiscImageChef.Database/Migrations/20191103000828_MakeFieldsUnsigned.cs

@@ -0,0 +1,17 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace DiscImageChef.Database.Migrations
+{
+    public partial class MakeFieldsUnsigned : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            // TODO: SQLite does not support dropping columns or foreign keys so just left them be
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            // Read above
+        }
+    }
+}