Delete row ('602', '20684') from daily_volatility

ticker_id 602
day 20684
implied_open 0.6159309052158367
implied_high 0.7207026571339945
implied_low 0.4603607281252388
implied_close 0.5667199308300354
historical_open 0.6683167811749156
historical_high 0.6683167811749156
historical_low 0.6683167811749156
historical_close 0.6683167811749156
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