Delete row ('1992', '20529') from daily_volatility

ticker_id 1992
day 20529
implied_open 0.4936971946446526
implied_high 0.5063968009377626
implied_low 0.4540109249786838
implied_close 0.4905222930713751
historical_open 0.6540297240951668
historical_high 0.6540297240951668
historical_low 0.6540297240951668
historical_close 0.6540297240951668
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