Delete row ('1338', '20420') from daily_volatility

ticker_id 1338
day 20420
implied_open 0.2031937006897606
implied_high 0.2047811514763993
implied_low 0.1952564467565668
implied_close 0.1968438975432056
historical_open 0.2174807577695094
historical_high 0.2174807577695094
historical_low 0.2174807577695094
historical_close 0.2174807577695094
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