Delete row ('680', '20731') from daily_volatility

ticker_id 680
day 20731
implied_open 0.2666917321553107
implied_high 0.2666917321553107
implied_low 0.2365301672091744
implied_close 0.2460548719290069
historical_open 0.187319192823373
historical_high 0.187319192823373
historical_low 0.187319192823373
historical_close 0.187319192823373
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