Delete row ('1547', '20731') from daily_volatility

ticker_id 1547
day 20731
implied_open 0.5905316926296166
implied_high 0.7016532476943295
implied_low 0.5905316926296166
implied_close 0.6921285429744969
historical_open 0.3571764269937197
historical_high 0.3571764269937197
historical_low 0.3571764269937197
historical_close 0.3571764269937197
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