discourse/app/models/single_sign_on_record.rb

class SingleSignOnRecord < ActiveRecord::Base
  belongs_to :user

  validates :external_id, uniqueness: true
end

# == Schema Information
#
# Table name: single_sign_on_records
#
#  id                  :integer          not null, primary key
#  user_id             :integer          not null
#  external_id         :string(255)      not null
#  last_payload        :text             not null
#  created_at          :datetime         not null
#  updated_at          :datetime         not null
#  external_username   :string(255)
#  external_email      :string(255)
#  external_name       :string(255)
#  external_avatar_url :string(1000)
#
# Indexes
#
#  index_single_sign_on_records_on_external_id  (external_id) UNIQUE
#