Delete row ('635', '20521') from daily_volatility

ticker_id 635
day 20521
implied_open 0.9429457672634202
implied_high 1.011206151088887
implied_low 0.8810351865845087
implied_close 0.8953222436642575
historical_open 1.066766928621243
historical_high 1.066766928621243
historical_low 1.066766928621243
historical_close 1.066766928621243
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