Delete row ('520', '20731') from daily_volatility

ticker_id 520
day 20731
implied_open 0.4301991631791025
implied_high 0.7524516728667696
implied_low 0.4301991631791025
implied_close 0.652442273308528
historical_open 0.2206556593427869
historical_high 0.2206556593427869
historical_low 0.2206556593427869
historical_close 0.2206556593427869
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