Delete row ('620', '20731') from daily_volatility

ticker_id 620
day 20731
implied_open 0.5698948324033128
implied_high 0.7016532476943295
implied_low 0.5698948324033128
implied_close 0.6699042319615544
historical_open 0.1904940943966505
historical_high 0.1904940943966505
historical_low 0.1904940943966505
historical_close 0.1904940943966505
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