Delete row ('331', '20181') from daily_volatility

ticker_id 331
day 20181
implied_open 0.7127654032008007
implied_high 0.8111873519724035
implied_low 0.7127654032008007
implied_close 0.8064249996124873
historical_open 0.9032594975974513
historical_high 0.9032594975974513
historical_low 0.9032594975974513
historical_close 0.9032594975974513
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