Delete row ('615', '20552') from daily_volatility

ticker_id 615
day 20552
implied_open 0.2079560530496768
implied_high 0.2079560530496768
implied_low 0.1952564467565668
implied_close 0.1968438975432056
historical_open 0.2031937006897606
historical_high 0.2031937006897606
historical_low 0.2031937006897606
historical_close 0.2031937006897606
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