Encrypt access_token and refresh_token

db/migrate/20200408212150_add_lockbox_columns.rb

@@ -0,0 +1,8 @@
+class AddLockboxColumns < ActiveRecord::Migration[6.0]
+  def change
+    add_column :authentications, :access_token_ciphertext, :text
+    add_column :authentications, :refresh_token_ciphertext, :text
+    remove_column :authentications, :access_token
+    remove_column :authentications, :refresh_token
+  end
+end