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static L deleteOldConcepts(Concepts cc default db_mainConcepts(), Class conceptClass, double minAgeInSeconds) { new L deleted; for (A c : cloneList(list(cc, conceptClass))) if (c._modified < now()-toMS(minAgeInSeconds)) { print("Deleting concept " + c); deleted.add(c); cdelete(c); } } ret deleted; }