indexer: reduce DB load

go/indexer/metrics/metrics.go

@@ -44,7 +44,7 @@ func NewMetrics(monitoredTokens map[string]string) *Metrics {
 	return &Metrics{
 		SyncHeight: promauto.NewGaugeVec(prometheus.GaugeOpts{
 			Name:      "sync_height",
-			Help:      "The max height of the indexer's last batch of L1 blocks.",
+			Help:      "The max height of the indexer's last batch of L1/L1 blocks.",
 			Namespace: metricsNamespace,
 		}, []string{
 			"chain",

go/indexer/services/l1/service.go

@@ -289,10 +289,15 @@ func (s *Service) Update(newHeader *types.Header) error {
 		logger.Error("Error querying state batches", "err", err)
 	}
 
-	for _, header := range headers {
+	for i, header := range headers {
 		blockHash := header.Hash
 		number := header.Number.Uint64()
 		deposits := depositsByBlockHash[blockHash]
+		batches := stateBatches[blockHash]
+
+		if len(deposits) == 0 && len(batches) == 0 && i != len(headers)-1 {
+			continue
+		}
 
 		block := &db.IndexedL1Block{
 			Hash:       blockHash,
@@ -313,7 +318,6 @@ func (s *Service) Update(newHeader *types.Header) error {
 			return err
 		}
 
-		batches := stateBatches[blockHash]
 		err = s.cfg.DB.AddStateBatch(batches)
 		if err != nil {
 			logger.Error(

go/indexer/services/l2/service.go

@@ -267,11 +267,15 @@ func (s *Service) Update(newHeader *types.Header) error {
 		}
 	}
 
-	for _, header := range headers {
+	for i, header := range headers {
 		blockHash := header.Hash()
 		number := header.Number.Uint64()
 		withdrawals := withdrawalsByBlockHash[blockHash]
 
+		if len(withdrawals) == 0 && i != len(headers)-1 {
+			continue
+		}
+
 		block := &db.IndexedL2Block{
 			Hash:        blockHash,
 			ParentHash:  header.ParentHash,