remove from legacy folder api

pkg/services/folder/folderimpl/conversions.go

@@ -62,13 +62,18 @@ func convertUnstructuredToFolder(item *unstructured.Unstructured, identifiers ma
 		}
 	}
 
+	parent := meta.GetFolder()
+	if folder.IsRootFolder(parent) {
+		parent = ""
+	}
+
 	manager, _ := meta.GetManagerProperties()
 	return &folder.Folder{
 		UID:         uid,
 		Title:       title,
 		Description: description,
 		ID:          meta.GetDeprecatedInternalID(), // nolint:staticcheck
-		ParentUID:   meta.GetFolder(),
+		ParentUID:   parent,
 		Version:     int(meta.GetGeneration()),
 		ManagedBy:   manager.Kind,
 

pkg/services/folder/folderimpl/folder.go

@@ -1384,7 +1384,7 @@ func SplitFullpath(s string) []string {
 func (s *Service) nestedFolderCreate(ctx context.Context, cmd *folder.CreateFolderCommand) (*folder.Folder, error) {
 	ctx, span := s.tracer.Start(ctx, "folder.nestedFolderCreate")
 	defer span.End()
-	if cmd.ParentUID != "" {
+	if !folder.IsRootFolder(cmd.ParentUID) {
 		if err := s.validateParent(ctx, cmd.OrgID, cmd.ParentUID, cmd.UID); err != nil {
 			return nil, err
 		}