fix: remove the functionality for deleting all state changes

due to an issue where deleting state change also deletes trie nodes,
the functionality for deleting state change data has been removed

core/kroma_migration.go

@@ -205,31 +205,3 @@ func DeleteStateChanges(db ethdb.KeyValueStore, blockNumber uint64) error {
 	}
 	return batch.Write()
 }
-
-func DeleteAllStateChanges(db ethdb.KeyValueStore) error {
-	batch := db.NewBatch()
-	deleteFunc := func(prefix []byte) error {
-		it := db.NewIterator(prefix, nil)
-		defer it.Release()
-		for it.Next() {
-			err := batch.Delete(it.Key())
-			if err != nil {
-				return err
-			}
-		}
-		if it.Error() != nil {
-			return it.Error()
-		}
-		return nil
-	}
-	if err := deleteFunc(destructChangesPrefix); err != nil {
-		return err
-	}
-	if err := deleteFunc(accountChangesPrefix); err != nil {
-		return err
-	}
-	if err := deleteFunc(storageChangesPrefix); err != nil {
-		return err
-	}
-	return batch.Write()
-}

migration/migrator.go

@@ -324,15 +324,6 @@ func (m *StateMigrator) FinalizeTransition(transitionBlock types.Block) {
 	// Switch trie backend to MPT
 	cfg.Zktrie = false
 	m.backend.BlockChain().TrieDB().SetBackend(false)
-
-	// Delete all state changes.
-	go func() {
-		if err := core.DeleteAllStateChanges(m.db); err != nil {
-			log.Warn("Failed to delete all state changes for MPT migration", "err", err)
-		} else {
-			log.Info("All state changes have been deleted for MPT migration")
-		}
-	}()
 }
 
 func (m *StateMigrator) waitForMigrationReady(target *types.Header) {