Delete row ('2491', '20523') from daily_volatility

ticker_id 2491
day 20523
implied_open 0.6683167811749156
implied_high 0.6810163874680256
implied_low 0.6318054130822243
implied_close 0.6619669780283606
historical_open 0.6191058067891142
historical_high 0.6191058067891142
historical_low 0.6191058067891142
historical_close 0.6191058067891142
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