refactor and fixes

db/migrate/20230819113427_remove_user_first_last_name_not_null.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+class RemoveUserFirstLastNameNotNull < ActiveRecord::Migration[7.0]
+  def change
+    change_column_null :users, :first_name, true
+    change_column_null :users, :last_name, true
+  end
+end