Delete row ('331', '20721') from daily_volatility

ticker_id 331
day 20721
implied_open 0.7683261807331572
implied_high 0.7921379425327385
implied_low 0.7635638283732409
implied_close 0.7842006885995447
historical_open 0.8334116629853461
historical_high 0.8334116629853461
historical_low 0.8334116629853461
historical_close 0.8334116629853461
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