Refactor snapshot parent updates: replace full metadata reload with UpdateSnapshotParentID method, enhance functional test logging, and add CleanOnRestore option.

manager.go

@@ -207,18 +207,8 @@ func (data *SnapshotManagerData) DeleteSnapshot(ctx context.Context, snapshotID
 	// Update parent references for any snapshots that have this one as a parent
 	for _, info := range allSnapshots {
 		if info.ParentID == snapshotID {
-			// Get the full snapshot details
-			childSnapshot, err := data.metadataStore.GetSnapshotMetadata(ctx, info.ID)
-			if err != nil {
-				data.logger.Printf("WARNING: failed to get child snapshot %s details: %v", info.ID, err)
-				continue
-			}
-
-			// Update the parent ID to point to the deleted snapshot's parent
-			childSnapshot.ParentID = parentID
-
-			// Save the updated snapshot
-			if err := data.metadataStore.SaveSnapshotMetadata(ctx, *childSnapshot); err != nil {
+			// Используем новый, более надежный метод для обновления только parent_id
+			if err := data.metadataStore.UpdateSnapshotParentID(ctx, info.ID, parentID); err != nil {
 				data.logger.Printf("WARNING: failed to update parent reference for snapshot %s: %v", info.ID, err)
 			} else {
 				data.logger.Printf("Updated parent reference for snapshot %s from %s to %s", info.ID, snapshotID, parentID)