Delete row ('268', '20201') from daily_volatility

ticker_id 268
day 20201
implied_open 0.5159215056575952
implied_high 0.5159215056575952
implied_low 0.4698854328450713
implied_close 0.4921097438580139
historical_open 0.7683261807331572
historical_high 0.7683261807331572
historical_low 0.7683261807331572
historical_close 0.7683261807331572
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