Delete row ('1571', '20620') from daily_volatility

ticker_id 1571
day 20620
implied_open 0.2000187991164831
implied_high 0.2047811514763993
implied_low 0.1889066436100118
implied_close 0.1936689959699281
historical_open 0.2095435038363156
historical_high 0.2095435038363156
historical_low 0.2095435038363156
historical_close 0.2095435038363156
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