Add deferrable argument to unique constraint

Author: ticosax

django-stubs/db/models/__init__.pyi

@@ -130,6 +130,7 @@ from . import signals as signals
 from .constraints import (
     BaseConstraint as BaseConstraint,
     CheckConstraint as CheckConstraint,
+    Deferrable as Deferrable,
     UniqueConstraint as UniqueConstraint,
 )
 

django-stubs/db/models/constraints.pyi

@@ -2,6 +2,7 @@ from typing import Any, Optional, Sequence, Tuple, Type, TypeVar
 
 from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.db.models.base import Model
+from django.db.models.constraints import Deferrable
 from django.db.models.query_utils import Q
 
 _T = TypeVar("_T", bound="BaseConstraint")
@@ -24,4 +25,4 @@ class CheckConstraint(BaseConstraint):
 class UniqueConstraint(BaseConstraint):
     fields: Tuple[str]
     condition: Optional[Q]
-    def __init__(self, *, fields: Sequence[str], name: str, condition: Optional[Q] = ...): ...
+    def __init__(self, *, fields: Sequence[str], name: str, condition: Optional[Q]= ..., deferrable: Deferrable = ...) -> None: ...