code: func (c *ChainIndexer) loadValidSections() {
  	data, _ := c.indexDb.Get([]byte("count"))
  	if len(data) == 8 {
  		c.storedSections = binary.BigEndian.Uint64(data)
  	}
  }
docs: // loadValidSections reads the number of valid sections from the index database
  // and caches is into the local state.