send user notes export

When I do it by hand, this is what I run:

def export_checkin_notes(user)
  body = user.checkins.sort_by(&:date).map { |i| [i.date, i.note].join(",") }
  ActionMailer::Base.mail(
      from: Rails.application.secrets.smtp_email_from,
      to: user.email,
      subject: "Flaredown data export",
      body: body
  ).deliver
end

existing export is: DataExportJob.perform_now(user.id)