Delete row ('1571', '20397') from daily_volatility

ticker_id 1571
day 20397
implied_open 0.2301803640626194
implied_high 0.2301803640626194
implied_low 0.1777944881035405
implied_close 0.1825568404634567
historical_open 0.1523952755173204
historical_high 0.1523952755173204
historical_low 0.1523952755173204
historical_close 0.1523952755173204
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