rosa-build/db/migrate/20130624095928_create_tokens.rb

class CreateTokens < ActiveRecord::Migration

  def change
    create_table :tokens do |t|
      t.integer :subject_id,    null: false, references: nil
      t.string  :subject_type,  null: false
      t.integer :creator_id,    null: false, references: nil
      t.integer :updater_id,                 references: nil
      t.string  :status,        default: 'active'
      t.text    :description
      t.string  :authentication_token, null: false

      t.timestamps
    end
    add_index :tokens, :authentication_token, unique: true
    add_index :tokens, [:subject_id, :subject_type]
  end

end