Delete row ('1571', '20719') from daily_volatility

ticker_id 1571
day 20719
implied_open 0.2190682085561481
implied_high 0.2333552656358969
implied_low 0.2095435038363156
implied_close 0.2206556593427869
historical_open 0.2000187991164831
historical_high 0.2000187991164831
historical_low 0.2000187991164831
historical_close 0.2000187991164831
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