Delete row ('635', '20686') from daily_volatility

ticker_id 635
day 20686
implied_open 0.9635826274897239
implied_high 0.9731073322095565
implied_low 0.9223089070371163
implied_close 0.9350085133302264
historical_open 1.049304969968217
historical_high 1.049304969968217
historical_low 1.049304969968217
historical_close 1.049304969968217
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