Delete row ('409', '20731') from daily_volatility

ticker_id 409
day 20731
implied_open 0.4428987694722125
implied_high 2.185919733201565
implied_low 0.4428987694722125
implied_close 1.416006101681769
historical_open 0.2603419290087557
historical_high 0.2603419290087557
historical_low 0.2603419290087557
historical_close 0.2603419290087557
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