Delete row ('40', '20150') from daily_volatility

ticker_id 40
day 20150
implied_open 0.3333646651941384
implied_high 0.3587638777803585
implied_low 0.3333646651941384
implied_close 0.355588976207081
historical_open 0.2190682085561481
historical_high 0.2190682085561481
historical_low 0.2190682085561481
historical_close 0.2190682085561481
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