Delete row ('615', '20739') from daily_volatility

ticker_id 615
day 20739
implied_open 0.1841442912500955
implied_high 0.1904940943966505
implied_low 0.1841442912500955
implied_close 0.1841442912500955
historical_open 0.1698572341703467
historical_high 0.1698572341703467
historical_low 0.1698572341703467
historical_close 0.1698572341703467
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