Delete row ('2550', '20728') from daily_volatility

ticker_id 2550
day 20728
implied_open 0.3508266238471647
implied_high 0.355588976207081
implied_low 0.342889369913971
implied_close 0.342889369913971
historical_open 0.2793913384484208
historical_high 0.2793913384484208
historical_low 0.2793913384484208
historical_close 0.2793913384484208
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