indexing needed?

gistfile1.rb

class CreateListProductInteractions < ActiveRecord::Migration
  def change
    create_table :list_product_interactions do |t|
      t.integer :votes_up, default: 0
      t.integer :votes_down, default: 0
      t.integer :votes_activity, default: 0
      t.integer :votes_total, default: 0
      t.integer :list_id
      t.integer :product_id

      t.timestamps
    end
  end
end


class CreateVotes < ActiveRecord::Migration
  def change
    create_table :votes do |t|
      t.string :status
      t.boolean :vote_up
      t.boolean :vote_down
      t.integer :user_id
      t.timestamps
    end
    add_index :votes, :user_id
  end
end