code: func NewChtIndexer(db ethdb.Database, odr OdrBackend, size, confirms uint64) *core.ChainIndexer {
  	trieTable := rawdb.NewTable(db, ChtTablePrefix)
  	backend := &ChtIndexerBackend{
  		diskdb:      db,
  		odr:         odr,
  		trieTable:   trieTable,
  		triedb:      trie.NewDatabaseWithCache(trieTable, 1), // Use a tiny cache only to keep memory down
  		sectionSize: size,
  	}
  	return core.NewChainIndexer(db, rawdb.NewTable(db, "chtIndexV2-"), backend, size, confirms, time.Millisecond*100, "cht")
  }
docs: // NewChtIndexer creates a Cht chain indexer