Delete row ('40', '20140') from daily_volatility

ticker_id 40
day 20140
implied_open 0.3016156494613633
implied_high 0.3286023128342221
implied_low 0.3016156494613633
implied_close 0.3270148620475834
historical_open 0.2174807577695094
historical_high 0.2174807577695094
historical_low 0.2174807577695094
historical_close 0.2174807577695094
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