class AddOpenTrackingToMailingRecipients < ActiveRecord::Migration[8.1]
  def change
    change_table :mailing_recipients do |t|
      t.string :tracking_token
      t.datetime :opened_at
      t.datetime :last_opened_at
      t.integer :open_count, null: false, default: 0
    end

    reversible do |dir|
      dir.up do
        execute <<~SQL.squish
          UPDATE mailing_recipients
          SET tracking_token = replace(gen_random_uuid()::text, '-', '')
          WHERE tracking_token IS NULL
        SQL
        change_column_null :mailing_recipients, :tracking_token, false
      end
    end

    add_index :mailing_recipients, :tracking_token, unique: true
    add_index :mailing_recipients, :opened_at
  end
end