Delete row ('635', '20679') from daily_volatility

ticker_id 635
day 20679
implied_open 1.022318306595358
implied_high 1.052479871541494
implied_low 0.9556453735565301
implied_close 0.9683449798496402
historical_open 1.081053985700992
historical_high 1.081053985700992
historical_low 1.081053985700992
historical_close 1.081053985700992
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