Delete row ('231', '20731') from daily_volatility

ticker_id 231
day 20731
implied_open 0.769913631519796
implied_high 0.9413583164767814
implied_low 0.6651418796016381
implied_close 0.7461018697202146
historical_open 0.5603701276834803
historical_high 0.5603701276834803
historical_low 0.5603701276834803
historical_close 0.5603701276834803
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