Delete row ('1571', '20528') from daily_volatility

ticker_id 1571
day 20528
implied_open 0.2016062499031218
implied_high 0.2031937006897606
implied_low 0.1857317420367343
implied_close 0.1936689959699281
historical_open 0.2127184054095931
historical_high 0.2127184054095931
historical_low 0.2127184054095931
historical_close 0.2127184054095931
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