Delete row ('2519', '20147') from daily_volatility

ticker_id 2519
day 20147
implied_open 0.639742667015418
implied_high 0.7016532476943295
implied_low 0.6238681591490305
implied_close 0.6286305115089468
historical_open 0.5667199308300354
historical_high 0.5667199308300354
historical_low 0.5667199308300354
historical_close 0.5667199308300354
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