Delete row ('6', '20172') from daily_volatility

ticker_id 6
day 20172
implied_open 1.0445426176083
implied_high 1.068354379407882
implied_low 0.9937441924358603
implied_close 1.000093995582415
historical_open 1.763657823955656
historical_high 1.763657823955656
historical_low 1.763657823955656
historical_close 1.763657823955656
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