   limit: @number().max(Number API_MAX).default(Number API_PAGE_SIZE)
   offset: @number()
   vertical_id: @objectId()
+  section_id: @objectId()
   artist_id: @objectId()
   artwork_id: @objectId()
   fair_ids: @array()

          author_id: ObjectId(article.author_id) if article.author_id
          fair_id: ObjectId(article.fair_id) if article.fair_id
          vertical_id: ObjectId(article.vertical_id) if article.vertical_id
          auction_id: ObjectId(article.auction_id) if article.auction_id
          partner_ids: article.partner_ids.map(ObjectId) if article.partner_ids
          show_ids: article.show_ids.map(ObjectId) if article.show_ids

  fair_id: @objectId().allow(null)
  auction_id: @objectId().allow(null)
  vertical_id: @objectId().allow(null)
  section_ids: @array().items(@objectId()).default([])
  biography_for_artist_id: @objectId().allow(null)
  featured: @boolean().default(false)
  exclude_google_news: @boolean().default(false)
