export const PRIVATE_COLUMN_KEY = {
  ID: '_id',

  // base key
  CTIME: '_ctime',
  MTIME: '_mtime',
  CREATOR: '_creator',
  LAST_MODIFIER: '_last_modifier',

  IS_DIR: '_is_dir',
  PARENT_DIR: '_parent_dir',
  FILE_CTIME: '_file_ctime',
  FILE_MTIME: '_file_mtime',
  FILE_CREATOR: '_file_creator',
  FILE_MODIFIER: '_file_modifier',
  FILE_NAME: '_name',
  FILE_TYPE: '_file_type',
};