anchor.diff:              var corrupted = false;
   
               Future import(Stream<String> lines, {bool safeMode}) async {
  -              _clear();
  +              _clearBeforeImport();
                 var firstLineRead = false;
  -              _exportStat = DatabaseExportStat();
   
                 await for (var line in lines) {
                   _exportStat.lineCount++;
  
positive.code: 
          await _findOrCreate();
          if (_storageBase.supported) {
            void _clear() {
              // empty stores and meta
              _meta = null;
              _mainStore = null;
              _stores.clear();
  
negative.code:               }
              }
            } else if (_storageJdb?.supported ?? false) {
              _clearBeforeImport();
              var map = await _storageJdb.readMeta();
  
              if (Meta.isMapMeta(map)) {
  