Delete row ('1961', '20511') from daily_volatility

ticker_id 1961
day 20511
implied_open 0.187319192823373
implied_high 0.1920815451832893
implied_low 0.174619586530263
implied_close 0.1841442912500955
historical_open 0.1984313483298443
historical_high 0.1984313483298443
historical_low 0.1984313483298443
historical_close 0.1984313483298443
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