Delete row ('491', '20735') from daily_volatility

ticker_id 491
day 20735
implied_open 0.2905034939548921
implied_high 0.2968532971014471
implied_low 0.284153690808337
implied_close 0.2889160431682533
historical_open 0.1857317420367343
historical_high 0.1857317420367343
historical_low 0.1857317420367343
historical_close 0.1857317420367343
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