Delete row ('2631', '20040') from daily_volatility

ticker_id 2631
day 20040
implied_open 0.788963040959461
implied_high 0.7937253933193773
implied_low 0.736577165000382
implied_close 0.7381646157870208
historical_open 1.087403788847547
historical_high 1.087403788847547
historical_low 1.087403788847547
historical_close 1.087403788847547
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