diff --git a/README.md b/README.md
index 5c9889f..48da90b 100644
--- a/README.md
+++ b/README.md
@@ -97,7 +97,7 @@ source .env.local
 make dev-postgres-start
 
 # Query only a single relay, and for the shortest time possible
-go run . core data-api-backfill --relay fb --min-slot -1
+go run . core data-api-backfill --relay fb --min-slot -1000
 
 # Now the DB has data, check it (and update in DB)
 go run . core check-payload-value
diff --git a/cmd/core/data-api-backfill.go b/cmd/core/data-api-backfill.go
index 9460ecf..aeb7720 100644
--- a/cmd/core/data-api-backfill.go
+++ b/cmd/core/data-api-backfill.go
@@ -11,6 +11,7 @@ import (
 	"github.com/flashbots/relayscan/common"
 	"github.com/flashbots/relayscan/database"
 	"github.com/flashbots/relayscan/vars"
+	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 )
 
@@ -54,7 +55,7 @@ var backfillDataAPICmd = &cobra.Command{
 		log.Infof("Relayscan %s", vars.Version)
 		log.Infof("Using %d relays", len(relays))
 		for index, relay := range relays {
-			log.Infof("relay #%d: %s", index+1, relay.Hostname())
+			log.Infof("- relay #%d: %s", index+1, relay.Hostname())
 		}
 
 		// Connect to Postgres
@@ -62,9 +63,9 @@ var backfillDataAPICmd = &cobra.Command{
 
 		// If needed, get latest slot (i.e. if min-slot is negative)
 		if minSlot < 0 {
-			log.Infof("Getting latest slot from beacon chain for offset %d", minSlot)
+			log.Infof("Getting latest slot from beaconcha.in for offset %d", minSlot)
 			latestSlotOnBeaconChain := common.MustGetLatestSlot()
-			log.Infof("- Latest slot from beacon chain: %d", latestSlotOnBeaconChain)
+			log.Infof("Latest slot from beaconcha.in: %d", latestSlotOnBeaconChain)
 			minSlot = int64(latestSlotOnBeaconChain) + minSlot
 		}
 
@@ -100,7 +101,7 @@ func newBackfiller(db *database.DatabaseService, relay common.RelayEntry, cursor
 
 func (bf *backfiller) backfillPayloadsDelivered() error {
 	_log := log.WithField("relay", bf.relay.Hostname())
-	_log.Info("backfilling payloads from relay data-api ...")
+	// _log.Info("backfilling payloads from relay data-api ...")
 
 	// 1. get latest entry from DB
 	latestEntry, err := bf.db.GetDataAPILatestPayloadDelivered(bf.relay.Hostname())
@@ -111,7 +112,7 @@ func (bf *backfiller) backfillPayloadsDelivered() error {
 	} else {
 		latestSlotInDB = latestEntry.Slot
 	}
-	_log.Infof("last payload in db for slot: %d", latestSlotInDB)
+	_log.Infof("Latest payload in DB for slot: %d", latestSlotInDB)
 
 	// 2. backfill until latest DB entry is reached
 	baseURL := bf.relay.GetURI("/relay/v1/data/bidtraces/proposer_payload_delivered")
@@ -125,22 +126,32 @@ func (bf *backfiller) backfillPayloadsDelivered() error {
 		if cursorSlot > 0 {
 			url = fmt.Sprintf("%s?cursor=%d", baseURL, cursorSlot)
 		}
-		_log.WithField("url: ", url).Info("fetching payloads...")
+		_log.WithField("url: ", url).Info("Fetching payloads...")
 		var data []relaycommon.BidTraceV2JSON
 		_, err = common.SendHTTPRequest(context.Background(), *http.DefaultClient, http.MethodGet, url, nil, &data)
 		if err != nil {
 			return err
 		}
 
-		_log.Infof("- response contains %d delivered payloads", len(data))
+		_log.Infof("Response contains %d delivered payloads", len(data))
 
 		// build a list of entries for batch DB update
 		entries := make([]*database.DataAPIPayloadDeliveredEntry, len(data))
+		slotFirst := uint64(0)
+		slotLast := uint64(0)
 		for index, payload := range data {
 			_log.Debugf("saving entry for slot %d", payload.Slot)
 			dbEntry := database.BidTraceV2JSONToPayloadDeliveredEntry(bf.relay.Hostname(), payload)
 			entries[index] = &dbEntry
 
+			// Set first and last slot
+			if slotFirst == 0 || payload.Slot < slotFirst {
+				slotFirst = payload.Slot
+			}
+			if slotLast == 0 || payload.Slot > slotLast {
+				slotLast = payload.Slot
+			}
+
 			// Count number of slots with payloads
 			if !slotsReceived[payload.Slot] {
 				slotsReceived[payload.Slot] = true
@@ -157,12 +168,18 @@ func (bf *backfiller) backfillPayloadsDelivered() error {
 		}
 
 		// Save entries
-		err := bf.db.SaveDataAPIPayloadDeliveredBatch(entries)
+		rowsAffected, err := bf.db.SaveDataAPIPayloadDeliveredBatch(entries)
 		if err != nil {
 			_log.WithError(err).Fatal("failed to save entries")
 			return err
 		}
 
+		_log.WithFields(logrus.Fields{
+			"rowsAffected": rowsAffected,
+			"slotFirst":    slotFirst,
+			"slotLast":     slotLast,
+		}).Info("Batch of payloads saved to database")
+
 		// Save builders
 		for builderPubkey := range builders {
 			err = bf.db.SaveBuilder(&database.BlockBuilderEntry{BuilderPubkey: builderPubkey})
@@ -179,7 +196,7 @@ func (bf *backfiller) backfillPayloadsDelivered() error {
 
 		// Stop if at the latest slot in DB
 		if cursorSlot < latestSlotInDB {
-			_log.Infof("Payloads backfilled until last in DB - at slot %d", latestSlotInDB)
+			_log.Infof("Payloads backfilled until last in DB at slot %d", latestSlotInDB)
 			return nil
 		}
 
diff --git a/database/database.go b/database/database.go
index 1948df9..50b35d2 100644
--- a/database/database.go
+++ b/database/database.go
@@ -67,9 +67,9 @@ func (s *DatabaseService) SaveDataAPIPayloadDelivered(entry *DataAPIPayloadDeliv
 	return err
 }
 
-func (s *DatabaseService) SaveDataAPIPayloadDeliveredBatch(entries []*DataAPIPayloadDeliveredEntry) error {
+func (s *DatabaseService) SaveDataAPIPayloadDeliveredBatch(entries []*DataAPIPayloadDeliveredEntry) (rowsAffected int64, err error) {
 	if len(entries) == 0 {
-		return nil
+		return 0, nil
 	}
 
 	query := `INSERT INTO ` + vars.TableDataAPIPayloadDelivered + `
@@ -84,12 +84,19 @@ func (s *DatabaseService) SaveDataAPIPayloadDeliveredBatch(entries []*DataAPIPay
 			end = len(entries)
 		}
 
-		_, err := s.DB.NamedExec(query, entries[i:end])
+		r, err := s.DB.NamedExec(query, entries[i:end])
 		if err != nil {
-			return err
+			return 0, err
 		}
+
+		_rowsAffected, err := r.RowsAffected()
+		if err != nil {
+			return 0, err
+		}
+
+		rowsAffected += _rowsAffected
 	}
-	return nil
+	return rowsAffected, nil
 }
 
 func (s *DatabaseService) GetDataAPILatestPayloadDelivered(relay string) (*DataAPIPayloadDeliveredEntry, error) {