Delete row ('1947', '20731') from daily_volatility

ticker_id 1947
day 20731
implied_open 0.3111403541811958
implied_high 0.3111403541811958
implied_low 0.1952564467565668
implied_close 0.1952564467565668
historical_open 0.1793819388901792
historical_high 0.1793819388901792
historical_low 0.1793819388901792
historical_close 0.1793819388901792
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