// assumes main concepts are empty before
// only works when you call db() afterwards
svoid quickImportMainConcepts(virtual Concepts oldConcepts, IF0<Bool> enabled default null) {
  if (!shortNameIs(oldConcepts, "Concepts")) ret;
  Concepts concepts = db_mainConcepts();
  concepts.miscMapPut("dbGrabber", func -> Bool {
    concepts.miscMapRemove("dbGrabber");
    pcall {
      if (isFalse(callF(enabled))) false;
      concepts.idCounter = getLong idCounter(oldConcepts);
      printVars_str(idCounter := concepts.idCounter);
      Map<Long, virtual Concept> oldMap = cast _get concepts(oldConcepts);
      printVars_str(+oldMap);
      
      new RealmCopy rc;
      rc.nonTransientOnly = true;
      rc.fullCopy = true;
      rc.overrideCollectionOrMapCopy = o -> {
        rc.classMap.put(_getClass(o), _getClass(o));
        false;
      };
      
      {
        temp tempSetTL(dynamicObjectIsLoading_threadLocal(), true);
        concepts.concepts.putAll((Map<Long, Concept>) rc.copy(oldMap));
      }
      pnl("quickImportDB", mapSortedByFunctionOnKey str(rc.classMap));
      
      // Note: this calls _doneLoading2() on all concepts
      concepts.assignConceptsToUs();
      print(nConcepts(countConcepts()) + " quick-imported");
      true;
    }
    false;
  });
}