Delete row ('1992', '20518') from daily_volatility

ticker_id 1992
day 20518
implied_open 0.5190964072308727
implied_high 0.5889442418429779
implied_low 0.5063968009377626
implied_close 0.5619575784701191
historical_open 0.6667293303882769
historical_high 0.6667293303882769
historical_low 0.6667293303882769
historical_close 0.6667293303882769
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