Delete row ('40', '20151') from daily_volatility

ticker_id 40
day 20151
implied_open 0.3540015254204422
implied_high 0.368288582500191
implied_low 0.3540015254204422
implied_close 0.361938779353636
historical_open 0.2190682085561481
historical_high 0.2190682085561481
historical_low 0.2190682085561481
historical_close 0.2190682085561481
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