socialforge/db/migrate/20180323014604_add_index_to_exercise_answers.rb

class AddIndexToExerciseAnswers < ActiveRecord::Migration
  def change
    add_index(:exercise_answers, [:exercise_question_id, :user_id], :name => 'ea')
    add_index(:exercise_answers, [:exercise_choice_id], :name => 'ec')
  end
end