Delete row ('602', '20503') from daily_volatility

ticker_id 602
day 20503
implied_open 0.6905410921878581
implied_high 0.7064156000542456
implied_low 0.6699042319615544
implied_close 0.6794289366813868
historical_open 0.7080030508408844
historical_high 0.7080030508408844
historical_low 0.7080030508408844
historical_close 0.7080030508408844
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