def get_last_tid(self):
        try:
            spec = {'tid': {'$gt': 0}}
            sort = [('tid', -1)]
            row = self.db.docs.find_one(spec, sort=sort)
        except Exception as e:
            raise DatabaseException(e)
        if row:
            return row['tid']
        return 0
def remove_duplicates(self):
        if self.ui.chkBRemoveDuplicates.isChecked():
            for lbl in self.message.message_type:
                seq = lbl.fuzz_values[:]
                seen = set()
                add_seen = seen.add
                lbl.fuzz_values = [l for l in seq if not (l in seen or add_seen(l))]