Delete row ('2491', '20647') from daily_volatility

ticker_id 2491
day 20647
implied_open 0.6635544288149993
implied_high 0.7175277555607169
implied_low 0.6635544288149993
implied_close 0.7127654032008007
historical_open 0.8492861708517336
historical_high 0.8492861708517336
historical_low 0.8492861708517336
historical_close 0.8492861708517336
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