Newznab providers will be compared based on url, not name.

Built-in Newznab providers cannot be deleted (they would be re-added anyways), nor can the URL be changed.

NzbDrone.Core/Datastore/Migrations/Migration20120504.cs

@@ -0,0 +1,15 @@
+using System.Data;
+using Migrator.Framework;
+
+namespace NzbDrone.Core.Datastore.Migrations
+{
+
+    [Migration(20120504)]
+    public class Migration20120504 : NzbDroneMigration
+    {
+        protected override void MainDbUpgrade()
+        {
+            Database.AddColumn("NewznabDefinitions", "BuiltIn", DbType.Boolean, ColumnProperty.Null);
+        }
+    }
+}