Delete row ('331', '20503') from daily_volatility

ticker_id 331
day 20503
implied_open 1.165188877392846
implied_high 1.212812400992008
implied_low 1.155664172673013
implied_close 1.181063385259233
historical_open 1.195350442338982
historical_high 1.195350442338982
historical_low 1.195350442338982
historical_close 1.195350442338982
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