Delete row ('331', '20091') from daily_volatility

ticker_id 331
day 20091
implied_open 0.7937253933193773
implied_high 0.87944773579787
implied_low 0.7175277555607169
implied_close 0.7413395173602982
historical_open 0.795312844106016
historical_high 0.795312844106016
historical_low 0.795312844106016
historical_close 0.795312844106016
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