Delete row ('2539', '20201') from daily_volatility

ticker_id 2539
day 20201
implied_open 0.4587732773386
implied_high 0.4587732773386
implied_low 0.4238493600325475
implied_close 0.4476611218321287
historical_open 0.6381552162287792
historical_high 0.6381552162287792
historical_low 0.6381552162287792
historical_close 0.6381552162287792
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