Delete row ('1992', '20656') from daily_volatility

ticker_id 1992
day 20656
implied_open 0.6746665843214706
implied_high 0.730227361853827
implied_low 0.6048187497093654
implied_close 0.6889536414012194
historical_open 0.5810069879097841
historical_high 0.5810069879097841
historical_low 0.5810069879097841
historical_close 0.5810069879097841
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