Delete row ('2539', '20307') from daily_volatility

ticker_id 2539
day 20307
implied_open 0.2508172242889232
implied_high 0.2619293797953945
implied_low 0.2428799703557294
implied_close 0.2571670274354782
historical_open 0.3730509348601073
historical_high 0.3730509348601073
historical_low 0.3730509348601073
historical_close 0.3730509348601073
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