Delete row ('1670', '20510') from daily_volatility

ticker_id 1670
day 20510
implied_open 0.7794383362396284
implied_high 0.7984877456792935
implied_low 0.7540391236534084
implied_close 0.7588014760133247
historical_open 0.8651606787181212
historical_high 0.8651606787181212
historical_low 0.8651606787181212
historical_close 0.8651606787181212
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