Delete row ('602', '20698') from daily_volatility

ticker_id 602
day 20698
implied_open 0.6349803146555018
implied_high 0.6413301178020567
implied_low 0.5857693402697004
implied_close 0.620693257575753
historical_open 0.7111779524141619
historical_high 0.7111779524141619
historical_low 0.7111779524141619
historical_close 0.7111779524141619
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