Delete row ('1992', '20525') from daily_volatility

ticker_id 1992
day 20525
implied_open 0.5222713088041502
implied_high 0.5349709150972602
implied_low 0.4794101375649039
implied_close 0.5048093501511239
historical_open 0.6619669780283606
historical_high 0.6619669780283606
historical_low 0.6619669780283606
historical_close 0.6619669780283606
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