Delete row ('635', '20207') from daily_volatility

ticker_id 635
day 20207
implied_open 0.9318336117569489
implied_high 0.9350085133302264
implied_low 0.8969096944508963
implied_close 0.9080218499573676
historical_open 1.18582573761915
historical_high 1.18582573761915
historical_low 1.18582573761915
historical_close 1.18582573761915
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