How to reset the sequence for IDs on PostgreSQL tables

Question

I recently imported a lot of data from an old database into a new Postgresql database as the basis for models in a new Django site.

I used the IDs from the old datab

Answer 1

based on @Paolo Melchiorre I created a custom management command, which populates all the models from chosen apps.

from django.core.management.base import BaseCommand
from django.apps import apps
from django.core.management.color import no_style
from django.db import connection

class Command(BaseCommand):
    def handle(self, *args, **kwargs):
        self.stdout.write('Reset AutoFields ...')
        APPS = ['app1', 'app2']

        APPS = [apps.get_app_config(app) for app in APPS]
        models = []
        for app in APPS:
            models.extend(list(app.get_models()))

        sequence_sql = connection.ops.sequence_reset_sql(no_style(), models)
        with connection.cursor() as cursor:
            for sql in sequence_sql:
                self.stdout.write(sql)
                cursor.execute(sql)
        self.stdout.write(self.style.SUCCESS('Reset AutoField complete.'))

tested using python 3.7 and django 2.2.