Delete row ('470', '20731') from daily_volatility

ticker_id 470
day 20731
implied_open 0.2079560530496768
implied_high 0.2222431101294256
implied_low 0.2063686022630381
implied_close 0.2079560530496768
historical_open 0.1571576278772367
historical_high 0.1571576278772367
historical_low 0.1571576278772367
historical_close 0.1571576278772367
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