Delete row ('2687', '20480') from daily_volatility

ticker_id 2687
day 20480
implied_open 0.847698720065095
implied_high 0.8556359739982887
implied_low 0.8222995074788748
implied_close 0.8254744090521523
historical_open 0.6937159937611357
historical_high 0.6937159937611357
historical_low 0.6937159937611357
historical_close 0.6937159937611357
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