diff --git a/backend/cmd/main.go b/backend/cmd/main.go
index df242be167..746f231388 100644
--- a/backend/cmd/main.go
+++ b/backend/cmd/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/gob"
 	"fmt"
 	"os"
 
@@ -22,8 +23,13 @@ import (
 	"github.com/gobitfly/beaconchain/cmd/typescript_converter"
 	"github.com/gobitfly/beaconchain/cmd/user_service"
 	"github.com/gobitfly/beaconchain/pkg/commons/log"
+	"github.com/gobitfly/beaconchain/pkg/commons/types"
 )
 
+func init() {
+	gob.RegisterName("github.com/gobitfly/eth2-beaconchain-explorer/types.UserV1Notification", types.UserV1Notification(0))
+}
+
 func main() {
 	if len(os.Args) < 2 {
 		log.Fatal(nil, "missing target", 0)
diff --git a/backend/pkg/commons/types/templates.go b/backend/pkg/commons/types/templates.go
index e6ba2dfb54..abe154a204 100644
--- a/backend/pkg/commons/types/templates.go
+++ b/backend/pkg/commons/types/templates.go
@@ -2099,3 +2099,11 @@ type ValidatorDutyInfo struct {
 	ProposerSlashingsCount int8          `db:"proposerslashingscount"`
 	AttesterSlashingsCount int8          `db:"attesterslashingscount"`
 }
+
+type UserV1Notification int
+
+const (
+	UserV1Notification_Unknown UserV1Notification = 0
+	UserV1Notification_True    UserV1Notification = 1
+	UserV1Notification_False   UserV1Notification = 2
+)