Delete row ('927', '20731') from daily_volatility

ticker_id 927
day 20731
implied_open 0.3730509348601073
implied_high 0.3730509348601073
implied_low 0.3365395667674159
implied_close 0.3524140746338035
historical_open 0.1920815451832893
historical_high 0.1920815451832893
historical_low 0.1920815451832893
historical_close 0.1920815451832893
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