Delete row ('331', '20161') from daily_volatility

ticker_id 331
day 20161
implied_open 0.8318242121987074
implied_high 0.8445238184918173
implied_low 0.769913631519796
implied_close 0.7730885330930735
historical_open 0.8619857771448437
historical_high 0.8619857771448437
historical_low 0.8619857771448437
historical_close 0.8619857771448437
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