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Screenshot of heroku bash running on cmdFirst of all, I deployed my django app on heroku. The site works well but when I try to interact with database (fill a form that submits input to db), I get a programming error. I learnt I needed to run a migrate command on heroku bash and did. After a few migrations it returned a lot of error lines, the first saying '..../django.db.backends.until.py, line 85, in _execute
return self.cursor.execute(SQL, params)
pyscopg2.DataError: integer out of range.
Then other lines of error saying the above error led to the others. How can I fix this please? Searched online but couldn't find it

PS if I run the migrate command cmd in dev mode on my machine it works well.

#0004_auto_... file


from django.db import migrations, models


class Migration(migrations.Migration):

dependencies = [
 ('mainsite', '0003_auto_20181109_2333'),
]

operations = [
 migrations.AlterField(
 model_name='contact',
 name='phone',
 field=models.CharField(max_length=20),
 ),
]

and then this is the affected model:

#models.py file

from django.db import models
from django.utils import timezone

# Create your models here.

class Contact(models.Model):
 name = models.CharField(max_length=200)
 email = models.CharField(max_length=100)
 phone = models.CharField(max_length=20)
 message = models.TextField()
 date = models.DateTimeFiel``d(default=timezone.now)


 def __str__(self):
 return self.name +'(' + self.email +')'

Thanks @alasdair for your time, poked around the net more and found the reason.
I ran makemigrations on heroku bash out for stupid curiousity. I should not have as it was what created those migrations file that gave me trouble. I ran migrate straight.