class AddAbTestToMailings < ActiveRecord::Migration[8.1]
  def change
    change_table :mailings do |t|
      t.boolean :ab_test, default: false, null: false
      t.string :ab_assignment, default: "from_record", null: false
      t.string :subject_b
      t.text :body_html_b
      t.bigint :mail_template_b_id
    end
    add_index :mailings, :ab_test
    add_foreign_key :mailings, :mail_templates, column: :mail_template_b_id

    add_column :mailing_recipients, :ab_variant, :string
    add_index :mailing_recipients, :ab_variant
  end
end