discourse/db/migrate/20200430072846_create_invited_users.rb

# frozen_string_literal: true

class CreateInvitedUsers < ActiveRecord::Migration[6.0]
  def change
    create_table :invited_users do |t|
      t.integer :user_id
      t.integer :invite_id, null: false
      t.datetime :redeemed_at
      t.timestamps null: false
    end

    add_index :invited_users, :invite_id
    add_index :invited_users, %i[user_id invite_id], unique: true, where: "user_id IS NOT NULL"
  end
end