Delete row ('2687', '20511') from daily_volatility

ticker_id 2687
day 20511
implied_open 0.8127748027590423
implied_high 0.8349991137719849
implied_low 0.7905504917460997
implied_close 0.814362253545681
historical_open 0.9127842023172839
historical_high 0.9127842023172839
historical_low 0.9127842023172839
historical_close 0.9127842023172839
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