Delete row ('31', '20731') from daily_volatility

ticker_id 31
day 20731
implied_open 0.5508454229636478
implied_high 0.6746665843214706
implied_low 0.5508454229636478
implied_close 0.6000563973494492
historical_open 0.5016344485778464
historical_high 0.5016344485778464
historical_low 0.5016344485778464
historical_close 0.5016344485778464
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