ALTER TABLE flx_conta_banc
ADD COLUMN dias_desconto integer;

ALTER TABLE flx_conta_banc
ADD COLUMN percentual_desconto numeric(18,6);

UPDATE flx_conta_banc SET  dias_desconto = 0 WHERE dias_desconto IS NULL ;
UPDATE flx_conta_banc SET  percentual_desconto = 0 WHERE percentual_desconto IS NULL ;

ALTER TABLE flx_conta_banc
ALTER COLUMN dias_desconto SET NOT NULL;


ALTER TABLE flx_conta_banc
ALTER COLUMN percentual_desconto SET NOT NULL;