Delete row ('1992', '20501') from daily_volatility

ticker_id 1992
day 20501
implied_open 0.5413207182438152
implied_high 0.5778320863365066
implied_low 0.5413207182438152
implied_close 0.5508454229636478
historical_open 0.6508548225218893
historical_high 0.6508548225218893
historical_low 0.6508548225218893
historical_close 0.6508548225218893
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