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 on_remove_duplicates_state_changed(self):
        self.fuzz_table_model.remove_duplicates = self.ui.chkBRemoveDuplicates.isChecked()
        self.fuzz_table_model.update()
        self.remove_duplicates()