Delete row ('1992', '20091') from daily_volatility

ticker_id 1992
day 20091
implied_open 0.6048187497093654
implied_high 0.652442273308528
implied_low 0.5381458166705377
implied_close 0.5937065942028942
historical_open 0.6587920764550831
historical_high 0.6587920764550831
historical_low 0.6587920764550831
historical_close 0.6587920764550831
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