chango.git/django/db, branch main

Fixed #37075 -- Allowed overriding the PostgreSQL pool's "check" callable.

2026-04-30T23:52:11Z

Setting "check" in OPTIONS["pool"] previously raised TypeError because the PostgreSQL backend always passed check= to ConnectionPool() and unpacked **pool_options on top, regardless of CONN_HEALTH_CHECKS. The user's callable now takes precedence via setdefault(); pool_options is copied first to avoid mutating the user's settings dict.

Fixed #36912 -- Added connector validation to Q.create().

2026-04-28T10:42:49Z

Co-authored-by: Jacob Walls

Fixed #37057 -- Adjusted UniqueConstraint handling of UNKNOWN condition.

2026-04-22T21:28:35Z

When we adjusted UNKNOWN handling for CheckConstraint in refs #33996 we assumed that all usage of Q.check would benefit from this approach. However while CHECK constraints enforcement do ignore conditions involving NULL that resolve to UNKNOWN it's not the case for other type of constraints such as UNIQUE ones. Given how UNKNOWN should be treated depends on the callers context it appears that a better strategy for COALESCE wrapping is to force them to apply it if necessary. Thanks Drew Shapiro for the report.

Fixed #35870 -- Made blank choice label in forms more accessible.

2026-04-22T21:06:29Z

Added new constant django.db.models.fields.BLANK_CHOICE_LABEL for an accessible and translatable blank choice label in forms. Deprecated django.db.models.fields.BLANK_CHOICE_DASH constant. Added the immediately deprecated transitional setting USE_BLANK_CHOICE_DASH. Co-Authored-By: Marijke Luttekes

Refs #36005 -- Made OperationCategory subclass StrEnum.

2026-04-20T20:49:26Z

Refs #28586 -- Added DEFAULT_FETCH_MODE module constant.

2026-04-19T19:28:13Z

This is a more attractive target for alteration than all of QuerySet.__init__().

Fixed #37047 -- Fixed crash in Query.orderby_issubset_groupby for descending and random order_by strings.

2026-04-19T08:03:11Z

Run this example: ```python User.objects.values("is_staff").annotate(latest=Max("date_joined")).order_by("-latest").count() ``` You should see the following exception: ``` django.core.exceptions.FieldError: Cannot resolve keyword '-latest' into field. ``` Regression in 2ce5cb0f7a4618dfdc5f5c10e53e2e9b9543d298.

Fixed #37036 -- Added missing flat=True arg in DeferredAttribute.fetch_many().

2026-04-18T13:39:50Z

Fixed #37028 -- Added BitAnd(), BitOr(), and BitXor() aggregates.

2026-04-18T06:53:21Z

Added DatabaseFeatures.disallowed_simple_test_case_connection_methods.

2026-04-16T09:28:19Z