feat(alerting): add migration for create and update

pkg/services/sqlstore/alert_rule.go

@@ -21,7 +21,6 @@ func init() {
 func GetAlertById(query *m.GetAlertByIdQuery) error {
 	alert := m.AlertRule{}
 	has, err := x.Id(query.Id).Get(&alert)
-
 	if !has {
 		return fmt.Errorf("could not find alert")
 	}

pkg/services/sqlstore/migrations/alert_mig.go

@@ -22,6 +22,8 @@ func addAlertMigrations(mg *Migrator) {
 			{Name: "query_range", Type: DB_NVarchar, Length: 255, Nullable: false},
 			{Name: "aggregator", Type: DB_NVarchar, Length: 255, Nullable: false},
 			{Name: "state", Type: DB_NVarchar, Length: 255, Nullable: false},
+			{Name: "created", Type: DB_DateTime, Nullable: false},
+			{Name: "updated", Type: DB_DateTime, Nullable: false},
 		},
 	}