{
  safe: (val) => (val != null ? '' + val : ''),
  format_record: (r) => (r.type != null ? r.type + ' ' : '') + 'id: ' + r.id,
  format_created: (r) => 'Created ' + r.type + ' (id: ' + r.id + ')',
  format_updated: (r) => 'Updated ' + r.type + ' (id: ' + r.id + ')',
  format_deleted: (id) => 'Deleted record (id: ' + id + ')'
}
