Delete row ('615', '20084') from daily_volatility

ticker_id 615
day 20084
implied_open 0.1698572341703467
implied_high 0.1936689959699281
implied_low 0.1698572341703467
implied_close 0.1857317420367343
historical_open 0.2031937006897606
historical_high 0.2031937006897606
historical_low 0.2031937006897606
historical_close 0.2031937006897606
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