Improve database-related check signatures (#2994)

Author: brianhelba

django-stubs/db/backends/base/validation.pyi

@@ -1,11 +1,12 @@
 from typing import Any
 
+from django.core.checks.messages import CheckMessage
 from django.db.backends.base.base import BaseDatabaseWrapper
 from django.db.models.fields import Field
 
 class BaseDatabaseValidation:
     connection: BaseDatabaseWrapper
     def __init__(self, connection: BaseDatabaseWrapper) -> None: ...
     def __del__(self) -> None: ...
-    def check(self, **kwargs: Any) -> list[Any]: ...
-    def check_field(self, field: Field, **kwargs: Any) -> list[Any]: ...
+    def check(self, **kwargs: Any) -> list[CheckMessage]: ...
+    def check_field(self, field: Field, **kwargs: Any) -> list[CheckMessage]: ...

django-stubs/db/backends/mysql/validation.pyi

@@ -1,9 +1,11 @@
 from typing import Any
 
+from django.core.checks.messages import CheckMessage
 from django.db.backends.base.validation import BaseDatabaseValidation
 from django.db.backends.mysql.base import DatabaseWrapper
+from django.db.models.fields import Field
 
 class DatabaseValidation(BaseDatabaseValidation):
     connection: DatabaseWrapper
-    def check(self, **kwargs: Any) -> Any: ...
-    def check_field_type(self, field: Any, field_type: Any) -> Any: ...
+    def check(self, **kwargs: Any) -> list[CheckMessage]: ...
+    def check_field_type(self, field: Field, field_type: str) -> list[CheckMessage]: ...

django-stubs/db/backends/oracle/validation.pyi

@@ -1,8 +1,8 @@
-from typing import Any
-
+from django.core.checks.messages import CheckMessage
 from django.db.backends.base.validation import BaseDatabaseValidation
 from django.db.backends.oracle.base import DatabaseWrapper
+from django.db.models.fields import Field
 
 class DatabaseValidation(BaseDatabaseValidation):
     connection: DatabaseWrapper
-    def check_field_type(self, field: Any, field_type: Any) -> Any: ...
+    def check_field_type(self, field: Field, field_type: str) -> list[CheckMessage]: ...

django-stubs/db/models/fields/mixins.pyi

@@ -1,5 +1,6 @@
 from typing import Any
 
+from django.core.checks.messages import CheckMessage
 from django.db.models.base import Model
 from django.utils.functional import cached_property
 from typing_extensions import deprecated
@@ -17,4 +18,4 @@ class FieldCacheMixin:
     def delete_cached_value(self, instance: Model) -> None: ...
 
 class CheckFieldDefaultMixin:
-    def check(self, **kwargs: Any) -> Any: ...
+    def check(self, **kwargs: Any) -> list[CheckMessage]: ...

django-stubs/db/models/manager.pyi

@@ -2,6 +2,7 @@ import datetime
 from collections.abc import AsyncIterator, Collection, Iterable, Iterator, Mapping, Sequence
 from typing import Any, Generic, Literal, NoReturn, TypeVar, overload
 
+from django.core.checks.messages import CheckMessage
 from django.db.models.base import Model
 from django.db.models.expressions import Combinable, OrderBy
 from django.db.models.query import Prefetch, QuerySet, RawQuerySet, _LookupT, _PrefetchedQuerySetT, _ToAttrT
@@ -22,7 +23,7 @@ class BaseManager(Generic[_T]):
     def deconstruct(
         self,
     ) -> tuple[bool, str | None, str | None, Sequence[Any] | None, dict[str, Any] | None]: ...
-    def check(self, **kwargs: Any) -> list[Any]: ...
+    def check(self, **kwargs: Any) -> list[CheckMessage]: ...
     @classmethod
     def from_queryset(cls, queryset_class: type[QuerySet[_T]], class_name: str | None = None) -> type[Self]: ...
     @classmethod