// assumes main concepts are empty before
svoid quickImportMainConcepts(virtual Concepts oldConcepts) {
  Concepts concepts = db_mainConcepts();
  concepts.miscMapPut("dbGrabber", func -> Bool {
    concepts.miscMapRemove("dbGrabber");
    pcall {
      concepts.idCounter = getLong idCounter(oldConcepts);
      printVars_str(idCounter := concepts.idCounter);
      Map<Long, virtual Concept> oldMap = cast _get concepts(oldConcepts);
      printVars_str(+oldMap);
      concepts.concepts.putAll((Map<Long, Concept>) quickImport_unlisted(oldMap));
      
      // Note: this calls _doneLoading2() on all concepts
      concepts.assignConceptsToUs();
      true;
    }
    false;
  });
}