Delete row ('251', '20731') from daily_volatility

ticker_id 251
day 20731
implied_open 0.1984313483298443
implied_high 0.1984313483298443
implied_low 0.1777944881035405
implied_close 0.1825568404634567
historical_open 0.1301709645043779
historical_high 0.1301709645043779
historical_low 0.1301709645043779
historical_close 0.1301709645043779
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