Delete row ('2756', '20528') from daily_volatility

ticker_id 2756
day 20528
implied_open 0.2603419290087557
implied_high 0.2762164368751432
implied_low 0.2492297735022844
implied_close 0.2539921258622007
historical_open 0.2238305609160644
historical_high 0.2238305609160644
historical_low 0.2238305609160644
historical_close 0.2238305609160644
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