static <A extends Concept> Pair<A, Bool> uniq2_sync(Class<A> c, fO... params) {
  ret uniq2_sync(db_mainConcepts(), c, params);
}

static <A extends Concept> Pair<A, Bool> uniq2_sync(Concepts cc, Class<A> c, fO... params) {
  ret withDBLock(cc, func -> Pair<A, Bool> { uniq2(cc, c, params) });
}