nice overview working

lib/services/storage_service.dart

@@ -17,6 +17,7 @@ class TxMetaStoreData {
     this.notesByMerchant = const {},
     this.exactTemplates = const {},
     this.customLabels = const [],
+    this.labelParents = const {},
   });
 
   final Map<String, TxMeta> byId;
@@ -24,6 +25,9 @@ class TxMetaStoreData {
   final Map<String, String> notesByMerchant;
   final Map<String, TxExactTemplate> exactTemplates;
   final List<TxLabel> customLabels;
+
+  /// childLabelId → parentLabelId (roots omitted).
+  final Map<String, String> labelParents;
 }
 
 /// Cached bank payload so the app stays usable across restarts / brief outages.
@@ -236,6 +240,7 @@ class StorageService {
       'customLabels': [
         for (final label in store.customLabels) label.toJson(),
       ],
+      'labelParents': store.labelParents,
     };
     return _prefs.setString(StorageKeys.txMeta, jsonEncode(encoded));
   }
@@ -323,12 +328,35 @@ class StorageService {
         }
       }
 
+      final labelParents = <String, String>{};
+      final parentsRaw = root['labelParents'];
+      if (parentsRaw is Map) {
+        parentsRaw.forEach((key, value) {
+          if (key is String &&
+              value is String &&
+              key.isNotEmpty &&
+              value.isNotEmpty) {
+            labelParents[key] = value;
+          }
+        });
+      }
+      // Prefer explicit map; fall back to parentId embedded on custom labels.
+      for (final label in customLabels) {
+        final parent = label.parentId;
+        if (parent != null &&
+            parent.isNotEmpty &&
+            !labelParents.containsKey(label.id)) {
+          labelParents[label.id] = parent;
+        }
+      }
+
       return TxMetaStoreData(
         byId: byId,
         labelsByMerchant: labelsByMerchant,
         notesByMerchant: notesByMerchant,
         exactTemplates: exactTemplates,
         customLabels: customLabels,
+        labelParents: labelParents,
       );
     } catch (_) {
       return const TxMetaStoreData();