Delete row ('615', '20559') from daily_volatility

ticker_id 615
day 20559
implied_open 0.2016062499031218
implied_high 0.2016062499031218
implied_low 0.1968438975432056
implied_close 0.1984313483298443
historical_open 0.2031937006897606
historical_high 0.2031937006897606
historical_low 0.2031937006897606
historical_close 0.2031937006897606
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