Delete row ('331', '20530') from daily_volatility

ticker_id 331
day 20530
implied_open 1.00644379872897
implied_high 1.015968503448803
implied_low 0.9731073322095565
implied_close 1.008031249515609
historical_open 1.150901820313097
historical_high 1.150901820313097
historical_low 1.150901820313097
historical_close 1.150901820313097
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