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lib/presentation/trainings/widgets/combo_builder_tab.dart

@@ -95,6 +95,8 @@ class _ComboBuilderTabState extends State<ComboBuilderTab> {
     _service.update(combo.copyWith(edges: edges));
   }
 
+  // Called once, when a drag ends — the canvas tracks positions itself
+  // during the drag, so this can persist immediately.
   void _moveNode(Combo combo, String id, Offset position) {
     _service.update(
       combo.copyWith(
@@ -103,7 +105,6 @@ class _ComboBuilderTabState extends State<ComboBuilderTab> {
             n.id == id ? n.copyWith(dx: position.dx, dy: position.dy) : n,
         ],
       ),
-      persist: false,
     );
   }
 
@@ -205,7 +206,6 @@ class _ComboBuilderTabState extends State<ComboBuilderTab> {
                               GraphEdgeData(e.fromId, e.toId),
                           ],
                           onNodeMoved: (id, pos) => _moveNode(combo, id, pos),
-                          onNodeDragEnd: (_) => _service.persistNow(),
                           onConnect: (from, to) => _toggleEdge(combo, from, to),
                           onNodeLongPress: (id) => _deleteNode(combo, id),
                         ),