Delete row ('1544', '20390') from daily_volatility

ticker_id 1544
day 20390
implied_open 0.2619293797953945
implied_high 0.2746289860885045
implied_low 0.2476423227156457
implied_close 0.2587544782221169
historical_open 0.1841442912500955
historical_high 0.1841442912500955
historical_low 0.1841442912500955
historical_close 0.1841442912500955
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