Delete row ('1908', '20731') from daily_volatility

ticker_id 1908
day 20731
implied_open 0.2619293797953945
implied_high 0.3016156494613633
implied_low 0.2381176179958132
implied_close 0.2428799703557294
historical_open 0.1381082184375716
historical_high 0.1381082184375716
historical_low 0.1381082184375716
historical_close 0.1381082184375716
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