Delete row ('2491', '20551') from daily_volatility

ticker_id 2491
day 20551
implied_open 0.7286399110671883
implied_high 0.7286399110671883
implied_low 0.5667199308300354
implied_close 0.6318054130822243
historical_open 0.6921285429744969
historical_high 0.6921285429744969
historical_low 0.6921285429744969
historical_close 0.6921285429744969
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