Delete row ('21', '20440') from daily_volatility

ticker_id 21
day 20440
implied_open 0.2000187991164831
implied_high 0.2000187991164831
implied_low 0.180969389676818
implied_close 0.1904940943966505
historical_open 0.2174807577695094
historical_high 0.2174807577695094
historical_low 0.2174807577695094
historical_close 0.2174807577695094
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