1class AddMissingIndexes < ActiveRecord::Migration
 2  def change
 3    add_index :exercise_sets, :exercise_id
 4    add_index :exercise_sets, [:exercise_id, :workout_id]
 5    add_index :routines, :program_id
 6    add_index :workouts, :routine_id
 7    add_index :users, :username
 8    add_index :users, [:username, :email]
 9  end
10end