Delete row ('40', '20510') from daily_volatility

ticker_id 40
day 20510
implied_open 0.5460830706037315
implied_high 0.5524328737502865
implied_low 0.5127466040843177
implied_close 0.5270336611640665
historical_open 0.4730603344183488
historical_high 0.4730603344183488
historical_low 0.4730603344183488
historical_close 0.4730603344183488
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