discourse/app/models/email_log.rb

class EmailLog < ActiveRecord::Base

  belongs_to :user
  validates_presence_of :email_type
  validates_presence_of :to_address

  after_create do
    # Update last_emailed_at if the user_id is present
    User.update_all("last_emailed_at = CURRENT_TIMESTAMP", ["id = ?", user_id]) if user_id.present?
  end

end