duplicate key value violates unique constraint "airport_pkey" code example
Example 1: duplicate key value violates unique constraint "pg_type_typname_nsp_index"
I was reading this. It seems this error rises when you are creating/updating the same table with parallel processing. I understand it depends because of this (as explained on the google group discussion).
So I think it depend from PostgreSQL itself and not from the connection driver or the module used for the multiprocessing.
Well, Actually, the only way I found to solve this is to create chunks big enough to have back a writing process slower than the calculation itself. With bigger chunks this error doesn't rise.
Example 2: 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()