Delete row ('1961', '20130') from daily_volatility

ticker_id 1961
day 20130
implied_open 0.1412831200108491
implied_high 0.1492203739440429
implied_low 0.1349333168642941
implied_close 0.1381082184375716
historical_open 0.2016062499031218
historical_high 0.2016062499031218
historical_low 0.2016062499031218
historical_close 0.2016062499031218
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