Delete row ('1819', '20731') from daily_volatility

ticker_id 1819
day 20731
implied_open 0.1825568404634567
implied_high 0.1920815451832893
implied_low 0.1777944881035405
implied_close 0.1793819388901792
historical_open 0.1508078247306817
historical_high 0.1508078247306817
historical_low 0.1508078247306817
historical_close 0.1508078247306817
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