Delete row ('2141', '20721') from daily_volatility

ticker_id 2141
day 20721
implied_open 0.8159497043323198
implied_high 0.8159497043323198
implied_low 0.7826132378129059
implied_close 0.7969002948926548
historical_open 0.7651512791598797
historical_high 0.7651512791598797
historical_low 0.7651512791598797
historical_close 0.7651512791598797
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