fix: only master node can migrate database

common/constants.go

@@ -1,6 +1,7 @@
 package common
 
 import (
+	"os"
 	"sync"
 	"time"
 
@@ -67,6 +68,8 @@ var PreConsumedQuota = 500
 
 var RootUserEmail = ""
 
+var IsMasterNode = os.Getenv("SYNC_FREQUENCY") == ""
+
 const (
 	RoleGuestUser  = 0
 	RoleCommonUser = 1