@cached_property
    def last_occurrence(self):
        rv = self.get_occurrences(limit=1)
        if rv:
            return rv[0]
Store a list of valid url parameters (used for valid cases for
dataset/ETHPy150Open getlogbook/logbook/logbook/ticketing.py/Ticket.last_occurrence--crossover with--dataset/ETHPy150Open F-Secure/mittn/mittn/httpfuzzer/steps.py/step_impl