Delete row ('831', '20731') from daily_volatility

ticker_id 831
day 20731
implied_open 0.1984313483298443
implied_high 0.1984313483298443
implied_low 0.1857317420367343
implied_close 0.1952564467565668
historical_open 0.1412831200108491
historical_high 0.1412831200108491
historical_low 0.1412831200108491
historical_close 0.1412831200108491
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