akkounts/db/migrate/20240607123654_add_settled_at_to_zaps.rb

class AddSettledAtToZaps < ActiveRecord::Migration[7.1]
  def change
    add_column :zaps, :settled_at, :datetime, default: nil

    Zap.where.not(receipt: nil).each do |zap|
      zap.update! settled_at: zap.receipt_event.created_at
    end
  end
end