Delete row ('1571', '20497') from daily_volatility

ticker_id 1571
day 20497
implied_open 0.1793819388901792
implied_high 0.180969389676818
implied_low 0.168269783383708
implied_close 0.174619586530263
historical_open 0.1968438975432056
historical_high 0.1968438975432056
historical_low 0.1968438975432056
historical_close 0.1968438975432056
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