From: Mariusz Felisiak <felisiak.mariusz@gmail.com>
Date: Sun, 28 Sep 2025 16:11:23 +0200
Subject: Skipped NOT NULL constraints on PostgreSQL 18+.

PostgreSQL 18+ stores column "NOT NULL" specifications in pg_constraint.

https://www.postgresql.org/docs/release/18.0/

Origin: upstream, https://github.com/django/django/pull/19910
Bug-Debian: https://bugs.debian.org/1117647
Last-Update: 2025-10-22
---
 django/db/backends/postgresql/introspection.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/django/db/backends/postgresql/introspection.py b/django/db/backends/postgresql/introspection.py
index 69bc871..fb876df 100644
--- a/django/db/backends/postgresql/introspection.py
+++ b/django/db/backends/postgresql/introspection.py
@@ -206,7 +206,9 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
                 cl.reloptions
             FROM pg_constraint AS c
             JOIN pg_class AS cl ON c.conrelid = cl.oid
-            WHERE cl.relname = %s AND pg_catalog.pg_table_is_visible(cl.oid)
+            WHERE cl.relname = %s
+                AND pg_catalog.pg_table_is_visible(cl.oid)
+                AND c.contype != 'n'
         """,
             [table_name],
         )