Delete row ('2766', '20168') from daily_volatility

ticker_id 2766
day 20168
implied_open 0.2349427164225357
implied_high 0.2508172242889232
implied_low 0.2254180117027031
implied_close 0.2270054624893419
historical_open 0.2412925195690907
historical_high 0.2412925195690907
historical_low 0.2412925195690907
historical_close 0.2412925195690907
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