Delete row ('990', '20731') from daily_volatility

ticker_id 990
day 20731
implied_open 0.4190870076726312
implied_high 0.4190870076726312
implied_low 0.2619293797953945
implied_close 0.2730415353018658
historical_open 0.2031937006897606
historical_high 0.2031937006897606
historical_low 0.2031937006897606
historical_close 0.2031937006897606
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