add tag subscriptions

db/migrate/20100307073438_create_tag_subscriptions.rb

@@ -0,0 +1,19 @@
+class CreateTagSubscriptions < ActiveRecord::Migration
+  def self.up
+    create_table :tag_subscriptions do |t|
+      t.column :owner_id, :integer, :null => false
+      t.column :name, :string, :null => false
+      t.column :tag_query, :string, :null => false
+      t.column :post_ids, :text, :null => false
+      t.column :is_visible_on_profile, :boolean, :null => false, :default => true
+      t.timestamps
+    end
+    
+    add_index :tag_subscriptions, :owner_id
+    add_index :tag_subscriptions, :name
+  end
+
+  def self.down
+    drop_table :tag_subscriptions
+  end
+end