Delete row ('506', '20731') from daily_volatility

ticker_id 506
day 20731
implied_open 2.098609939936434
implied_high 2.098609939936434
implied_low 1.127090058513516
implied_close 1.127090058513516
historical_open 0.6286305115089468
historical_high 0.6286305115089468
historical_low 0.6286305115089468
historical_close 0.6286305115089468
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