Delete row ('1571', '20150') from daily_volatility

ticker_id 1571
day 20150
implied_open 0.1777944881035405
implied_high 0.1920815451832893
implied_low 0.1777944881035405
implied_close 0.1904940943966505
historical_open 0.1952564467565668
historical_high 0.1952564467565668
historical_low 0.1952564467565668
historical_close 0.1952564467565668
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