chore(node): add timing logs and improve node status diagnostics

- master: add TIMING logs in setWorkerNodeOnline to mark start and completed DB update
- handler: log node status for reconnection debugging and include active/enabled values in "node not active or enabled" error

Author: Marvin Zhang

core/node/service/master_service.go

@@ -252,6 +252,8 @@ func (svc *MasterService) setWorkerNodeOnline(node *models.Node) {
 		return
 	}
 
+	svc.Infof("[TIMING] Starting setWorkerNodeOnline for node[%s]", node.Key)
+
 	oldStatus := node.Status
 	node.Status = constants.NodeStatusOnline
 	node.Active = true
@@ -264,6 +266,8 @@ func (svc *MasterService) setWorkerNodeOnline(node *models.Node) {
 		return
 	}
 
+	svc.Infof("[TIMING] Completed database update for node[%s] - Active=%v, Enabled=%v, Status=%s",
+		node.Key, node.Active, node.Enabled, node.Status)
 	svc.Infof("worker node[%s] status changed from '%s' to 'online'", node.Key, oldStatus)
 
 	// send notification if status changed

core/task/handler/service.go

@@ -217,9 +217,13 @@ func (svc *Service) processFetchCycle() error {
 		return fmt.Errorf("failed to get current node: %w", err)
 	}
 
+	// Log node status for debugging reconnection issues
+	svc.Debugf("[TIMING] Node status check: Active=%v, Enabled=%v, Status=%s",
+		n.Active, n.Enabled, n.Status)
+
 	// skip if node is not active or enabled
 	if !n.Active || !n.Enabled {
-		return fmt.Errorf("node not active or enabled")
+		return fmt.Errorf("node not active or enabled (active=%v, enabled=%v)", n.Active, n.Enabled)
 	}
 
 	// validate if max runners is reached (max runners = 0 means no limit)