Delete row ('1992', '20509') from daily_volatility

ticker_id 1992
day 20509
implied_open 0.5619575784701191
implied_high 0.6079936512826429
implied_low 0.4936971946446526
implied_close 0.6079936512826429
historical_open 0.6540297240951668
historical_high 0.6540297240951668
historical_low 0.6540297240951668
historical_close 0.6540297240951668
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