saved searches: drop unused name and category columns.

db/migrate/20170428220448_remove_name_and_category_from_saved_searches.rb

@@ -0,0 +1,8 @@
+class RemoveNameAndCategoryFromSavedSearches < ActiveRecord::Migration
+  def change
+    SavedSearch.without_timeout do
+      remove_column :saved_searches, :name, :text
+      remove_column :saved_searches, :category, :text
+    end
+  end
+end