triedb: reset state indexer after snap synced (#32104)

Fix the issue after initial snap sync with `gcmode=archive` enabled.

```
NewPayload: inserting block failed       error="history indexing is out of order, last: null, requested: 1"
```

---------

Signed-off-by: Delweng <delweng@gmail.com>
Co-authored-by: Gary Rong <garyrong0905@gmail.com>

Author: jsvisa

triedb/pathdb/database.go

@@ -520,6 +520,16 @@ func (db *Database) Enable(root common.Hash) error {
 	// Re-construct a new disk layer backed by persistent state
 	// and schedule the state snapshot generation if it's permitted.
 	db.tree.init(generateSnapshot(db, root, db.isVerkle || db.config.SnapshotNoBuild))
+
+	// After snap sync, the state of the database may have changed completely.
+	// To ensure the history indexer always matches the current state, we must:
+	//   1. Close any existing indexer
+	//   2. Re-initialize the indexer so it starts indexing from the new state root.
+	if db.indexer != nil && db.freezer != nil && db.config.EnableStateIndexing {
+		db.indexer.close()
+		db.indexer = newHistoryIndexer(db.diskdb, db.freezer, db.tree.bottom().stateID())
+		log.Info("Re-enabled state history indexing")
+	}
 	log.Info("Rebuilt trie database", "root", root)
 	return nil
 }

triedb/pathdb/history_indexer.go

@@ -494,7 +494,18 @@ func (i *indexIniter) index(done chan struct{}, interrupt *atomic.Int32, lastID
 	// when the state is reverted manually (chain.SetHead) or the deep reorg is
 	// encountered. In such cases, no indexing should be scheduled.
 	if beginID > lastID {
-		log.Debug("State history is fully indexed", "last", lastID)
+		if lastID == 0 && beginID == 1 {
+			// Initialize the indexing flag if the state history is empty by
+			// using zero as the disk layer ID. This is a common case that
+			// can occur after snap sync.
+			//
+			// This step is essential to avoid spinning up indexing thread
+			// endlessly until a history object is produced.
+			storeIndexMetadata(i.disk, 0)
+			log.Info("Initialized history indexing flag")
+		} else {
+			log.Debug("State history is fully indexed", "last", lastID)
+		}
 		return
 	}
 	log.Info("Start history indexing", "beginID", beginID, "lastID", lastID)