Delete row ('404', '20747') from daily_volatility

ticker_id 404
day 20747
implied_open 0.1555701770905979
implied_high 0.1555701770905979
implied_low 0.1508078247306817
implied_close 0.1555701770905979
historical_open 0.1238211613578228
historical_high 0.1238211613578228
historical_low 0.1238211613578228
historical_close 0.1238211613578228
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