Delete row ('1366', '20518') from daily_volatility

ticker_id 1366
day 20518
implied_open 0.2968532971014471
implied_high 0.3349521159807772
implied_low 0.2968532971014471
implied_close 0.3206650589010284
historical_open 0.3032031002480021
historical_high 0.3032031002480021
historical_low 0.3032031002480021
historical_close 0.3032031002480021
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