text: const userListKey = "user_list";
  const getUserToDoItemsKey = (userId) => `user_${userId}_todo_items`;
  const getItemAttachmentsKey = (itemId) => `itemId_${itemId}_attachments`;
  
  module.exports = {
    userListKey,
    getUserToDoItemsKey,
    getItemAttachmentsKey,
  };
  