Delete row ('1992', '20150') from daily_volatility

ticker_id 1992
day 20150
implied_open 0.7270524602805495
implied_high 0.7683261807331572
implied_low 0.652442273308528
implied_close 0.7461018697202146
historical_open 1.001681446369054
historical_high 1.001681446369054
historical_low 1.001681446369054
historical_close 1.001681446369054
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