Delete row ('6', '20466') from daily_volatility

ticker_id 6
day 20466
implied_open 0.9778696845694728
implied_high 0.988981840075944
implied_low 0.9397708656901427
implied_close 0.9651700782763627
historical_open 0.9524704719832526
historical_high 0.9524704719832526
historical_low 0.9524704719832526
historical_close 0.9524704719832526
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