Delete row ('1571', '20494') from daily_volatility

ticker_id 1571
day 20494
implied_open 0.2063686022630381
implied_high 0.2079560530496768
implied_low 0.2000187991164831
implied_close 0.2047811514763993
historical_open 0.1555701770905979
historical_high 0.1555701770905979
historical_low 0.1555701770905979
historical_close 0.1555701770905979
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