Delete row ('1571', '20181') from daily_volatility

ticker_id 1571
day 20181
implied_open 0.2238305609160644
implied_high 0.265104281368672
implied_low 0.2190682085561481
implied_close 0.265104281368672
historical_open 0.2127184054095931
historical_high 0.2127184054095931
historical_low 0.2127184054095931
historical_close 0.2127184054095931
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