properties:
  uid:
    type: string
  book:
    type: string
  para:
    type: string
  channel_id:
    type: string
  progress:
    type: number
  lang:
    type: string
  title:
    type: string
  summary:
    type: string
  updated_at:
    type: string
  created_at:
    type: string
