def _read_table_file(self, table_file):
        """Read an `astropy.table.Table` to set up the archive"""
        self._table_file = table_file
        if os.path.exists(self._table_file):
            self._table = Table.read(self._table_file)
        else:
            self._table = FileHandle.make_table({})
        self._fill_cache()
Read an `astropy.table.Table` to set up the archive