Delete row ('1406', '20620') from daily_volatility

ticker_id 1406
day 20620
implied_open 0.1857317420367343
implied_high 0.1904940943966505
implied_low 0.174619586530263
implied_close 0.1777944881035405
historical_open 0.2031937006897606
historical_high 0.2031937006897606
historical_low 0.2031937006897606
historical_close 0.2031937006897606
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