Delete row ('1961', '20509') from daily_volatility

ticker_id 1961
day 20509
implied_open 0.1984313483298443
implied_high 0.2016062499031218
implied_low 0.1857317420367343
implied_close 0.1936689959699281
historical_open 0.1968438975432056
historical_high 0.1968438975432056
historical_low 0.1968438975432056
historical_close 0.1968438975432056
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