Delete row ('1571', '20531') from daily_volatility

ticker_id 1571
day 20531
implied_open 0.2016062499031218
implied_high 0.2127184054095931
implied_low 0.2016062499031218
implied_close 0.2095435038363156
historical_open 0.2047811514763993
historical_high 0.2047811514763993
historical_low 0.2047811514763993
historical_close 0.2047811514763993
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