/// Raw persisted payload for sync queue state.
class SyncStateRecord {
  const SyncStateRecord({required this.rawState});

  final String rawState;
}

/// Persistence boundary for sync queue metadata and pending changes.
abstract interface class SyncStateStore {
  /// Reads stored sync state payload.
  Future<SyncStateRecord?> read();

  /// Writes sync state payload.
  Future<void> write({required String rawState});

  /// Clears stored sync state payload.
  Future<void> clear();
}