Delete row ('615', '20488') from daily_volatility

ticker_id 615
day 20488
implied_open 0.265104281368672
implied_high 0.2825662400216983
implied_low 0.2619293797953945
implied_close 0.2746289860885045
historical_open 0.2111309546229543
historical_high 0.2111309546229543
historical_low 0.2111309546229543
historical_close 0.2111309546229543
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