Delete row ('939', '20734') from daily_volatility

ticker_id 939
day 20734
implied_open 0.3127278049678346
implied_high 0.4174995568859924
implied_low 0.2746289860885045
implied_close 0.3508266238471647
historical_open 0.168269783383708
historical_high 0.168269783383708
historical_low 0.168269783383708
historical_close 0.168269783383708
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