Delete row ('404', '20516') from daily_volatility

ticker_id 404
day 20516
implied_open 0.1841442912500955
implied_high 0.1857317420367343
implied_low 0.1666823325970692
implied_close 0.1698572341703467
historical_open 0.1762070373169017
historical_high 0.1762070373169017
historical_low 0.1762070373169017
historical_close 0.1762070373169017
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