Delete row ('1961', '20501') from daily_volatility

ticker_id 1961
day 20501
implied_open 0.1936689959699281
implied_high 0.2047811514763993
implied_low 0.1936689959699281
implied_close 0.2016062499031218
historical_open 0.1889066436100118
historical_high 0.1889066436100118
historical_low 0.1889066436100118
historical_close 0.1889066436100118
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