def METHOD_NAME(self, ssid):
    def thd(conn):
        tbl = self.db.model.sourcestamps
        q = tbl.select(whereclause=tbl.c.id == ssid)
        res = conn.execute(q)
        row = res.fetchone()
        if not row:
            return None
        ssdict = self._rowToSsdict_thd(conn, row)
        res.close()
        return ssdict
    return self.db.pool.do(thd)