Delete row ('1571', '20180') from daily_volatility

ticker_id 1571
day 20180
implied_open 0.2254180117027031
implied_high 0.2301803640626194
implied_low 0.2174807577695094
implied_close 0.2206556593427869
historical_open 0.2111309546229543
historical_high 0.2111309546229543
historical_low 0.2111309546229543
historical_close 0.2111309546229543
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