diff --git a/agent/app/model/cronjob.go b/agent/app/model/cronjob.go
index 1d8bca9f1..0ded2757c 100644
--- a/agent/app/model/cronjob.go
+++ b/agent/app/model/cronjob.go
@@ -11,7 +11,7 @@ type Cronjob struct {
 
 	Name       string `gorm:"not null" json:"name"`
 	Type       string `gorm:"not null" json:"type"`
-	GroupID    uint   `gorm:"not null;default:0" json:"groupID"`
+	GroupID    uint   `json:"groupID"`
 	SpecCustom bool   `json:"specCustom"`
 	Spec       string `gorm:"not null" json:"spec"`
 
diff --git a/agent/init/migration/migrate.go b/agent/init/migration/migrate.go
index 4d5b1da20..21e483d38 100644
--- a/agent/init/migration/migrate.go
+++ b/agent/init/migration/migrate.go
@@ -34,6 +34,7 @@ func InitAgentDB() {
 		migrations.AddMethodToAlertLog,
 		migrations.AddMethodToAlertTask,
 		migrations.UpdateMcpServer,
+		migrations.InitCronjobGroup,
 	})
 	if err := m.Migrate(); err != nil {
 		global.LOG.Error(err)
diff --git a/agent/init/migration/migrations/init.go b/agent/init/migration/migrations/init.go
index b27159a07..fd9e1448b 100644
--- a/agent/init/migration/migrations/init.go
+++ b/agent/init/migration/migrations/init.go
@@ -433,3 +433,16 @@ var UpdateMcpServer = &gormigrate.Migration{
 		return nil
 	},
 }
+
+var InitCronjobGroup = &gormigrate.Migration{
+	ID: "20250805-init-cronjob-group",
+	Migrate: func(tx *gorm.DB) error {
+		if err := tx.AutoMigrate(&model.Cronjob{}); err != nil {
+			return err
+		}
+		if err := tx.Model(&model.Cronjob{}).Where("1=1").Updates(map[string]interface{}{"group_id": 0}).Error; err != nil {
+			return err
+		}
+		return nil
+	},
+}