Delete row ('2547', '20727') from daily_volatility

ticker_id 2547
day 20727
implied_open 0.542908169030454
implied_high 0.6048187497093654
implied_low 0.5206838580175115
implied_close 0.5698948324033128
historical_open 0.3968626966596887
historical_high 0.3968626966596887
historical_low 0.3968626966596887
historical_close 0.3968626966596887
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