Delete row ('1992', '20690') from daily_volatility

ticker_id 1992
day 20690
implied_open 0.4619481789118776
implied_high 0.4714728836317101
implied_low 0.4444862202588513
implied_close 0.4603607281252388
historical_open 0.6635544288149993
historical_high 0.6635544288149993
historical_low 0.6635544288149993
historical_close 0.6635544288149993
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