Delete row ('40', '20664') from daily_volatility

ticker_id 40
day 20664
implied_open 0.4889348422847364
implied_high 0.5190964072308727
implied_low 0.4889348422847364
implied_close 0.5032218993644851
historical_open 0.7905504917460997
historical_high 0.7905504917460997
historical_low 0.7905504917460997
historical_close 0.7905504917460997
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