Delete row ('40', '20147') from daily_volatility

ticker_id 40
day 20147
implied_open 0.3317772144074996
implied_high 0.3508266238471647
implied_low 0.3317772144074996
implied_close 0.342889369913971
historical_open 0.2190682085561481
historical_high 0.2190682085561481
historical_low 0.2190682085561481
historical_close 0.2190682085561481
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