Delete row ('268', '20151') from daily_volatility

ticker_id 268
day 20151
implied_open 0.6302179622955855
implied_high 0.6429175685886955
implied_low 0.5952940449895329
implied_close 0.6127560036425592
historical_open 0.6873661906145806
historical_high 0.6873661906145806
historical_low 0.6873661906145806
historical_close 0.6873661906145806
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