Delete row ('1961', '20629') from daily_volatility

ticker_id 1961
day 20629
implied_open 0.2285929132759806
implied_high 0.2412925195690907
implied_low 0.2190682085561481
implied_close 0.2301803640626194
historical_open 0.2254180117027031
historical_high 0.2254180117027031
historical_low 0.2254180117027031
historical_close 0.2254180117027031
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