models.py:

from __future__ import unicode_literals
from django.db import models

class DjangoTestPessoa(models.Model):
    objectid = models.BigIntegerField(primary_key=True,unique=True)
    nome = models.CharField(max_length=150, blank=True, null=True)

    class Meta:
        db_table = '"GEO"."DJANGO_PESSOA"'


class DjangoTestDocumento(models.Model):
    objectid = models.BigIntegerField(primary_key=True,unique=True)
    numero = models.CharField(max_length=150, blank=True, null=True)
    pessoas = models.ManyToManyField(DjangoTestPessoa)
    
    class Meta:
        db_table = '"GEO"."DJANGO_DOCUMENTO"'