Delete row ('2604', '20168') from daily_volatility

ticker_id 2604
day 20168
implied_open 0.2016062499031218
implied_high 0.2111309546229543
implied_low 0.2000187991164831
implied_close 0.2063686022630381
historical_open 0.2016062499031218
historical_high 0.2016062499031218
historical_low 0.2016062499031218
historical_close 0.2016062499031218
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