A whole bunch of changes

lib/services/database_service.dart

@@ -267,6 +267,67 @@ class DatabaseService {
     return copied.path;
   }
 
+  /// Soft-deletes every active vehicle and fuel entry — as if the user had
+  /// deleted each one individually (see [softDeleteVehicle]/
+  /// [softDeleteFuelEntry] for why these aren't real `DELETE`s: the
+  /// tombstones are what let the deletion propagate to other synced devices
+  /// on the next sync, rather than the rows just being silently re-imported
+  /// from the cloud copy). Also empties the local receipts folder outright
+  /// rather than deleting file-by-file, to catch any orphaned file a
+  /// tracked path might have missed.
+  Future<void> purgeAllData(DateTime deletedAt) async {
+    final ts = deletedAt.millisecondsSinceEpoch;
+    await _db.update(
+      'fuel_entries',
+      {'deleted_at': ts, 'updated_at': ts, 'dirty': 1},
+      where: 'deleted_at IS NULL',
+    );
+    await _db.update(
+      'vehicles',
+      {'deleted_at': ts, 'updated_at': ts, 'dirty': 1},
+      where: 'deleted_at IS NULL',
+    );
+
+    if (await receiptsDirectory.exists()) {
+      await receiptsDirectory.delete(recursive: true);
+    }
+    await receiptsDirectory.create(recursive: true);
+  }
+
+  /// Soft-deletes every active fuel entry (across all vehicles) whose
+  /// [FuelEntry.date] falls within [start]–[end] inclusive, and returns
+  /// their local receipt image paths so the caller can clean those files up
+  /// too. Vehicles are left untouched — a date range only makes sense
+  /// against the fuel entries logged against them, not the vehicles
+  /// themselves.
+  Future<List<String>> purgeFuelEntriesInRange(
+    DateTime start,
+    DateTime end,
+    DateTime deletedAt,
+  ) async {
+    final rangeStart = DateTime(start.year, start.month, start.day).millisecondsSinceEpoch;
+    final rangeEndExclusive =
+        DateTime(end.year, end.month, end.day).add(const Duration(days: 1)).millisecondsSinceEpoch;
+    final ts = deletedAt.millisecondsSinceEpoch;
+
+    final rows = await _db.query(
+      'fuel_entries',
+      where: 'deleted_at IS NULL AND date >= ? AND date < ?',
+      whereArgs: [rangeStart, rangeEndExclusive],
+    );
+    final localPaths =
+        rows.map((r) => r['receipt_image_path'] as String?).whereType<String>().toList();
+
+    await _db.update(
+      'fuel_entries',
+      {'deleted_at': ts, 'updated_at': ts, 'dirty': 1},
+      where: 'deleted_at IS NULL AND date >= ? AND date < ?',
+      whereArgs: [rangeStart, rangeEndExclusive],
+    );
+
+    return localPaths;
+  }
+
   Future<void> deleteReceiptImageFile(String? path) async {
     if (path == null) return;
     final file = File(path);