Delete row ('1911', '20731') from daily_volatility

ticker_id 1911
day 20731
implied_open 1.208050048632092
implied_high 2.39546323703788
implied_low 0.7381646157870208
implied_close 0.7556265744400472
historical_open 0.6984783461210519
historical_high 0.6984783461210519
historical_low 0.6984783461210519
historical_close 0.6984783461210519
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