Delete row ('404', '20487') from daily_volatility

ticker_id 404
day 20487
implied_open 0.1587450786638754
implied_high 0.1730321357436242
implied_low 0.1539827263039592
implied_close 0.1730321357436242
historical_open 0.1301709645043779
historical_high 0.1301709645043779
historical_low 0.1301709645043779
historical_close 0.1301709645043779
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