Delete row ('615', '20487') from daily_volatility

ticker_id 615
day 20487
implied_open 0.2476423227156457
implied_high 0.2666917321553107
implied_low 0.2476423227156457
implied_close 0.2619293797953945
historical_open 0.2079560530496768
historical_high 0.2079560530496768
historical_low 0.2079560530496768
historical_close 0.2079560530496768
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