Delete row ('635', '20151') from daily_volatility

ticker_id 635
day 20151
implied_open 1.281072784817475
implied_high 1.342983365496386
implied_low 1.095341042780741
implied_close 1.252498670657977
historical_open 1.238211613578228
historical_high 1.238211613578228
historical_low 1.238211613578228
historical_close 1.238211613578228
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