Delete row ('1544', '20507') from daily_volatility

ticker_id 1544
day 20507
implied_open 0.2206556593427869
implied_high 0.3111403541811958
implied_low 0.2206556593427869
implied_close 0.2968532971014471
historical_open 0.2793913384484208
historical_high 0.2793913384484208
historical_low 0.2793913384484208
historical_close 0.2793913384484208
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