Delete row ('938', '20731') from daily_volatility

ticker_id 938
day 20731
implied_open 0.2698666337285883
implied_high 0.2952658463148083
implied_low 0.2698666337285883
implied_close 0.2920909447415308
historical_open 0.2619293797953945
historical_high 0.2619293797953945
historical_low 0.2619293797953945
historical_close 0.2619293797953945
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