Delete row ('236', '20731') from daily_volatility

ticker_id 236
day 20731
implied_open 0.9032594975974513
implied_high 1.003268897155693
implied_low 0.8810351865845087
implied_close 0.9191340054638388
historical_open 0.5206838580175115
historical_high 0.5206838580175115
historical_low 0.5206838580175115
historical_close 0.5206838580175115
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