Delete row ('2631', '20318') from daily_volatility

ticker_id 2631
day 20318
implied_open 0.8619857771448437
implied_high 0.9159591038905613
implied_low 0.8064249996124873
implied_close 0.8064249996124873
historical_open 0.9318336117569489
historical_high 0.9318336117569489
historical_low 0.9318336117569489
historical_close 0.9318336117569489
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