added better db migration support than what Subsonic provides out of the box.

Migrator.net/Migrator.Framework/MigrationAttribute.cs

@@ -0,0 +1,53 @@
+#region License
+
+//The contents of this file are subject to the Mozilla Public License
+//Version 1.1 (the "License"); you may not use this file except in
+//compliance with the License. You may obtain a copy of the License at
+//http://www.mozilla.org/MPL/
+//Software distributed under the License is distributed on an "AS IS"
+//basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
+//License for the specific language governing rights and limitations
+//under the License.
+
+#endregion
+
+using System;
+
+namespace Migrator.Framework
+{
+    /// <summary>
+    /// Describe a migration
+    /// </summary>
+    public class MigrationAttribute : Attribute
+    {
+        private long _version;
+        private bool _ignore = false;
+
+        /// <summary>
+        /// Describe the migration
+        /// </summary>
+        /// <param name="version">The unique version of the migration.</param>	
+        public MigrationAttribute(long version)
+        {
+            Version = version;
+        }
+
+        /// <summary>
+        /// The version reflected by the migration
+        /// </summary>
+        public long Version
+        {
+            get { return _version; }
+            private set { _version = value; }
+        }
+
+        /// <summary>
+        /// Set to <c>true</c> to ignore this migration.
+        /// </summary>
+        public bool Ignore
+        {
+            get { return _ignore; }
+            set { _ignore = value; }
+        }
+    }
+}