Delete row ('40', '20648') from daily_volatility

ticker_id 40
day 20648
implied_open 0.4682979820584325
implied_high 0.4936971946446526
implied_low 0.4682979820584325
implied_close 0.4730603344183488
historical_open 0.776263434666351
historical_high 0.776263434666351
historical_low 0.776263434666351
historical_close 0.776263434666351
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