Delete row ('1571', '20711') from daily_volatility

ticker_id 1571
day 20711
implied_open 0.2111309546229543
implied_high 0.2190682085561481
implied_low 0.2111309546229543
implied_close 0.2174807577695094
historical_open 0.1920815451832893
historical_high 0.1920815451832893
historical_low 0.1920815451832893
historical_close 0.1920815451832893
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