Delete row ('12', '20266') from daily_volatility

ticker_id 12
day 20266
implied_open 0.2555795766488395
implied_high 0.2698666337285883
implied_low 0.2444674211423682
implied_close 0.2571670274354782
historical_open 0.1968438975432056
historical_high 0.1968438975432056
historical_low 0.1968438975432056
historical_close 0.1968438975432056
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