docs: protected void sleepAfterWrite(StoreTransaction txh, MaskedTimestamp mustPass) throws BackendException {
          assert mustPass.getDeletionTime(times) < mustPass.getAdditionTime(times);
          try {
              times.sleepPast(mustPass.getAdditionTimeInstant(times));
          } catch (InterruptedException e) {
              throw new PermanentBackendException("Unexpected interrupt", e);
          }
      }