greenlight/db/migrate/20180504131648_create_users.rb

class CreateUsers < ActiveRecord::Migration[5.0]
  def change
    create_table :users do |t|
      t.string :provider
      t.string :uid
      t.string :name
      t.string :username
      t.string :email
      t.string :password_digest, index: { unique: true }

      t.timestamps
    end
  end
end