Delete row ('6', '20698') from daily_volatility

ticker_id 6
day 20698
implied_open 0.8397614661319012
implied_high 0.8588108755715662
implied_low 0.8365865645586236
implied_close 0.8413489169185399
historical_open 1.38901943830891
historical_high 1.38901943830891
historical_low 1.38901943830891
historical_close 1.38901943830891
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