Delete row ('635', '20510') from daily_volatility

ticker_id 635
day 20510
implied_open 1.000093995582415
implied_high 1.176301032899317
implied_low 0.8635732279314824
implied_close 1.008031249515609
historical_open 0.9842194877160277
historical_high 0.9842194877160277
historical_low 0.9842194877160277
historical_close 0.9842194877160277
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