Delete row ('1544', '20150') from daily_volatility

ticker_id 1544
day 20150
implied_open 0.1857317420367343
implied_high 0.2079560530496768
implied_low 0.1841442912500955
implied_close 0.2079560530496768
historical_open 0.1730321357436242
historical_high 0.1730321357436242
historical_low 0.1730321357436242
historical_close 0.1730321357436242
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