Delete row ('978', '20731') from daily_volatility

ticker_id 978
day 20731
implied_open 0.8270618598387911
implied_high 0.8349991137719849
implied_low 0.7588014760133247
implied_close 0.7873755901728222
historical_open 0.969932430636279
historical_high 0.969932430636279
historical_low 0.969932430636279
historical_close 0.969932430636279
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