Delete row ('602', '20571') from daily_volatility

ticker_id 602
day 20571
implied_open 0.769913631519796
implied_high 0.7937253933193773
implied_low 0.7191152063473557
implied_close 0.7588014760133247
historical_open 0.6730791335348318
historical_high 0.6730791335348318
historical_low 0.6730791335348318
historical_close 0.6730791335348318
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