Delete row ('635', '20502') from daily_volatility

ticker_id 635
day 20502
implied_open 1.060417125474688
implied_high 1.114390452220406
implied_low 0.8826226373711474
implied_close 1.077879084127714
historical_open 1.009618700302248
historical_high 1.009618700302248
historical_low 1.009618700302248
historical_close 1.009618700302248
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