code: def delete(self, dash_id):
          
          removed_info = dict(
              time_modified = r_db.zscore(config.DASH_ID_KEY, dash_id),
              meta = r_db.hget(config.DASH_META_KEY, dash_id),
              content = r_db.hget(config.DASH_CONTENT_KEY, dash_id))
          r_db.zrem(config.DASH_ID_KEY, dash_id)
          r_db.hdel(config.DASH_META_KEY, dash_id)
          r_db.hdel(config.DASH_CONTENT_KEY, dash_id)
          return {'removed_info': removed_info}
docs: Delete a dash meta and content, return updated dash content.
  
          Actually, just remove it to a specfied place in database.
  
          Args:
              dash_id: dashboard id.
  
          Returns:
              Redirect to home page.