Delete row ('331', '20115') from daily_volatility

ticker_id 331
day 20115
implied_open 0.9810445861427503
implied_high 1.152489271099736
implied_low 0.9810445861427503
implied_close 1.088991239634185
historical_open 1.015968503448803
historical_high 1.015968503448803
historical_low 1.015968503448803
historical_close 1.015968503448803
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