Delete row ('1571', '20481') from daily_volatility

ticker_id 1571
day 20481
implied_open 0.2016062499031218
implied_high 0.2095435038363156
implied_low 0.1968438975432056
implied_close 0.2063686022630381
historical_open 0.1365207676509329
historical_high 0.1365207676509329
historical_low 0.1365207676509329
historical_close 0.1365207676509329
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