Delete row ('40', '20621') from daily_volatility

ticker_id 40
day 20621
implied_open 0.5381458166705377
implied_high 0.5444956198170927
implied_low 0.5032218993644851
implied_close 0.5222713088041502
historical_open 0.4873473914980976
historical_high 0.4873473914980976
historical_low 0.4873473914980976
historical_close 0.4873473914980976
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