Delete row ('331', '20621') from daily_volatility

ticker_id 331
day 20621
implied_open 1.068354379407882
implied_high 1.074704182554437
implied_low 1.035017912888468
implied_close 1.058829674688049
historical_open 0.9953316432224991
historical_high 0.9953316432224991
historical_low 0.9953316432224991
historical_close 0.9953316432224991
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