Delete row ('2788', '20731') from daily_volatility

ticker_id 2788
day 20731
implied_open 0.284153690808337
implied_high 0.3000281986747246
implied_low 0.277803887661782
implied_close 0.2809787892350595
historical_open 0.2190682085561481
historical_high 0.2190682085561481
historical_low 0.2190682085561481
historical_close 0.2190682085561481
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