indexer

The indexer listens for on-chain Transfer events and stores them in a database for fast querying.索引器监听链上的 Transfer 事件并将其存储在数据库中以供快速查询。

Without an indexer, dApps would need to re-scan the entire blockchain on every page load to reconstruct user history.如果没有索引器，dApp 就需要在每次加载页面时重新扫描整个区块链来重建用户历史记录。