Delete row ('2468', '20731') from daily_volatility

ticker_id 2468
day 20731
implied_open 0.549257972177009
implied_high 0.5873567910563391
implied_low 0.4984595470045688
implied_close 0.5476705213903703
historical_open 0.4714728836317101
historical_high 0.4714728836317101
historical_low 0.4714728836317101
historical_close 0.4714728836317101
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