FEATURE: Add new_since column to UserStat so we can reset the "New"

date.

db/migrate/20140303185354_add_new_since_to_user_stats.rb

@@ -0,0 +1,10 @@
+class AddNewSinceToUserStats < ActiveRecord::Migration
+  def change
+    add_column :user_stats, :new_since, :datetime
+    execute "UPDATE user_stats AS us
+               SET new_since = u.created_at
+             FROM users AS u
+              WHERE u.id = us.user_id"
+    change_column :user_stats, :new_since, :datetime, null: false
+  end
+end