Delete row ('21', '20439') from daily_volatility

ticker_id 21
day 20439
implied_open 0.1952564467565668
implied_high 0.2031937006897606
implied_low 0.1904940943966505
implied_close 0.1984313483298443
historical_open 0.2174807577695094
historical_high 0.2174807577695094
historical_low 0.2174807577695094
historical_close 0.2174807577695094
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