duplicate key value violates unique constraint "django_migrations_pkey" DETAIL: Key (id)=(51) already exists. code example

Example: duplicate key value violates unique constraint "django_migrations_pkey"

from django.db import connections

query = "SELECT setval('django_migrations_id_seq', (SELECT MAX(id) FROM django_migrations))"
cursor = connections['default'].cursor()
cursor.execute(query) 
row = cursor.fetchone()