Delete row ('1571', '20518') from daily_volatility

ticker_id 1571
day 20518
implied_open 0.1857317420367343
implied_high 0.1936689959699281
implied_low 0.1857317420367343
implied_close 0.1936689959699281
historical_open 0.2095435038363156
historical_high 0.2095435038363156
historical_low 0.2095435038363156
historical_close 0.2095435038363156
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