Almost forget. It thanks to Peterino comments on 
this https://stackoverflow.com/a/2357942/2579404

On Friday, April 12, 2019 at 6:16:04 PM UTC+7, Yongky Tria Putra wrote:
>
> I solve it with this two lines code in my models:
>
> from thirdparty.models import 
> ParentModelClassParentModelClass._meta.get_field('default_price').max_digits 
> = 9
>
> then makemigrations && migrate
>
> voila it work, but i don't know any downside using this tricks.
>
> Hope it will help others with similar situation as well.
>
> On Thursday, April 11, 2019 at 6:46:32 PM UTC+7, Yongky Tria Putra wrote:
>>
>> Hello everyone,
>>
>> What is the best way to modified database field restrictions in third 
>> party app (pretix)? Currently, i want to change max_digits=7  to 
>> max_digits=9  in database below.
>>
>> default_price = models.DecimalField(
>> decimal_places=2, max_digits=7,
>> null=True, blank=True,
>> verbose_name=_("Default price"),
>> )
>> Is it possible without modified the third party source code?
>> Thanks
>>
>

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