Delete row ('1571', '20712') from daily_volatility

ticker_id 1571
day 20712
implied_open 0.2158933069828706
implied_high 0.2222431101294256
implied_low 0.2158933069828706
implied_close 0.2190682085561481
historical_open 0.1793819388901792
historical_high 0.1793819388901792
historical_low 0.1793819388901792
historical_close 0.1793819388901792
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