Delete row ('1961', '20438') from daily_volatility

ticker_id 1961
day 20438
implied_open 0.1603325294505142
implied_high 0.1650948818104304
implied_low 0.1492203739440429
implied_close 0.161919980237153
historical_open 0.1730321357436242
historical_high 0.1730321357436242
historical_low 0.1730321357436242
historical_close 0.1730321357436242
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