Delete row ('635', '20271') from daily_volatility

ticker_id 635
day 20271
implied_open 0.6762540351081093
implied_high 0.6921285429744969
implied_low 0.6048187497093654
implied_close 0.6603795272417218
historical_open 0.8746853834379538
historical_high 0.8746853834379538
historical_low 0.8746853834379538
historical_close 0.8746853834379538
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