Delete row ('776', '20731') from daily_volatility

ticker_id 776
day 20731
implied_open 0.3095529033945571
implied_high 0.3095529033945571
implied_low 0.2619293797953945
implied_close 0.2698666337285883
historical_open 0.2000187991164831
historical_high 0.2000187991164831
historical_low 0.2000187991164831
historical_close 0.2000187991164831
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