Delete row ('635', '20494') from daily_volatility

ticker_id 635
day 20494
implied_open 1.096928493567379
implied_high 1.103278296713935
implied_low 0.9143716531039225
implied_close 0.9985065447957765
historical_open 0.9778696845694728
historical_high 0.9778696845694728
historical_low 0.9778696845694728
historical_close 0.9778696845694728
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