Delete row ('6', '20749') from daily_volatility

ticker_id 6
day 20749
implied_open 1.109628099860489
implied_high 1.114390452220406
implied_low 1.08264143648763
implied_close 1.084228887274269
historical_open 0.9556453735565301
historical_high 0.9556453735565301
historical_low 0.9556453735565301
historical_close 0.9556453735565301
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