Delete row ('331', '20713') from daily_volatility

ticker_id 331
day 20713
implied_open 0.8032500980392098
implied_high 0.8032500980392098
implied_low 0.7667387299465185
implied_close 0.7683261807331572
historical_open 0.9461206688366977
historical_high 0.9461206688366977
historical_low 0.9461206688366977
historical_close 0.9461206688366977
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