Delete row ('1512', '20648') from daily_volatility

ticker_id 1512
day 20648
implied_open 0.9302461609703101
implied_high 0.9397708656901427
implied_low 0.9191340054638388
implied_close 0.9318336117569489
historical_open 0.9905692908625827
historical_high 0.9905692908625827
historical_low 0.9905692908625827
historical_close 0.9905692908625827
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