Delete row ('1571', '20438') from daily_volatility

ticker_id 1571
day 20438
implied_open 0.1539827263039592
implied_high 0.1555701770905979
implied_low 0.1460454723707654
implied_close 0.1492203739440429
historical_open 0.1714446849569855
historical_high 0.1714446849569855
historical_low 0.1714446849569855
historical_close 0.1714446849569855
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