Delete row ('644', '20733') from daily_volatility

ticker_id 644
day 20733
implied_open 0.8191246059055973
implied_high 1.06994183019452
implied_low 0.6937159937611357
implied_close 0.9429457672634202
historical_open 0.4936971946446526
historical_high 0.4936971946446526
historical_low 0.4936971946446526
historical_close 0.4936971946446526
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