instrumental/db/migrate/20161122163057_remove_unneeded_indexes.rb

class RemoveUnneededIndexes < ActiveRecord::Migration[5.0]
  def change
    remove_index :notifications, name: 'index_notifications_on_account_id'
    remove_index :settings, name: 'index_settings_on_target_type_and_target_id'
    remove_index :statuses_tags, name: 'index_statuses_tags_on_tag_id'
  end
end