Delete row ('2491', '20181') from daily_volatility

ticker_id 2491
day 20181
implied_open 0.6778414858947481
implied_high 0.86674812950476
implied_low 0.6778414858947481
implied_close 0.8572234247849274
historical_open 0.8603983263582049
historical_high 0.8603983263582049
historical_low 0.8603983263582049
historical_close 0.8603983263582049
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