Delete row ('2491', '20164') from daily_volatility

ticker_id 2491
day 20164
implied_open 0.7064156000542456
implied_high 0.7270524602805495
implied_low 0.671491682748193
implied_close 0.6730791335348318
historical_open 0.6619669780283606
historical_high 0.6619669780283606
historical_low 0.6619669780283606
historical_close 0.6619669780283606
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