refactor: add tag and relation methods to node to enforce integrity

cmd/del.go

@@ -17,12 +17,13 @@ var delCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 		svc, err := service.GetNodeService(cfg)
 		if err != nil {
-			fmt.Fprintln(os.Stderr, "failed to create service: %v", err)
+			fmt.Fprintln(os.Stderr, err)
 			return
 		}
+
 		n, err := svc.GetByID(args[0])
 		if err != nil {
-			fmt.Fprintln(os.Stderr, "  node not found:", args[0])
+			fmt.Fprintf(os.Stderr, "node not found: %s", args[0])
 			return
 		}
 
@@ -36,7 +37,7 @@ var delCmd = &cobra.Command{
 		}
 
 		if err := svc.Delete(args[0]); err != nil {
-			fmt.Fprintln(os.Stderr, "failed to delete: ", err)
+			fmt.Fprintf(os.Stderr, "failed to delete: %v", err)
 		} else {
 			output.PrintAction(cmd.OutOrStdout(), "Deleted", args[0], true)
 		}