Set created_at field from v2 created_at in User migration (#5265)

* Set created_at field from v2 created_at in User migration

* Remove useless line

app/controllers/api/v1/migrations/external_controller.rb

@@ -217,7 +217,7 @@ module Api
         end
 
         def user_params
-          decrypted_params.require(:user).permit(:name, :email, :provider, :external_id, :language, :role)
+          decrypted_params.require(:user).permit(:name, :email, :provider, :external_id, :language, :role, :created_at)
         end
 
         def room_params