diff --git a/.vscode/settings.json b/.vscode/settings.json
index 6ae8e86a..48cc2f5e 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,8 +1,18 @@
 {
+    "black-formatter.path": [
+        ".venv/bin/python",
+        "-m",
+        "black"
+    ],
     "black-formatter.args": [
         "--config",
         "pyproject.toml"
     ],
+    "mypy-type-checker.path": [
+        ".venv/bin/python",
+        "-m",
+        "mypy"
+    ],
     "pylint.path": [
         ".venv/bin/python",
         "-m",
diff --git a/codeforlife/__init__.py b/codeforlife/__init__.py
index a0a545a0..9d552079 100644
--- a/codeforlife/__init__.py
+++ b/codeforlife/__init__.py
@@ -1,6 +1,12 @@
-from pathlib import Path
+"""
+© Ocado Group
+Created on 09/12/2023 at 11:02:54(+00:00).
+
+Entry point to the Code for Life package.
+"""
 
-import django_stubs_ext
+import typing as t
+from pathlib import Path
 
 from .version import __version__
 
@@ -11,7 +17,10 @@
 BASE_DIR = Path(__file__).resolve().parent
 DATA_DIR = BASE_DIR.joinpath("data")
 
-django_stubs_ext.monkeypatch()
+if t.TYPE_CHECKING:
+    import django_stubs_ext
+
+    django_stubs_ext.monkeypatch()
 
 # ------------------------------------------------------------------------------
 
diff --git a/codeforlife/models/__init__.py b/codeforlife/models/__init__.py
index 430adb51..ca8117dd 100644
--- a/codeforlife/models/__init__.py
+++ b/codeforlife/models/__init__.py
@@ -17,13 +17,28 @@
 from .fields import *
 
 
-class AbstractModel(models.Model):
-    """Base model to be inherited by other models throughout the CFL system."""
+class Model(models.Model):
+    """Provide type hints for general model attributes."""
+
+    id: int
+    pk: int
+    objects: models.Manager
+    DoesNotExist: t.Type[ObjectDoesNotExist]
+
+    class Meta(TypedModelMeta):
+        abstract = True
+
+
+AnyModel = t.TypeVar("AnyModel", bound=Model)
+
+
+class WarehouseModel(Model):
+    """To be inherited by all models whose data is to be warehoused."""
 
     class QuerySet(models.QuerySet):
         """Custom queryset to support CFL's system's operations."""
 
-        model: "AbstractModel"  # type: ignore[assignment]
+        model: "WarehouseModel"  # type: ignore[assignment]
 
         def update(self, **kwargs):
             """Updates all models in the queryset and notes when they were last
@@ -44,18 +59,19 @@ def delete(self, wait: t.Optional[timedelta] = None):
 
             Args:
                 wait: How long to wait before these model are deleted. If not
-                    set, the class-level default value is used.
+                    set, the class-level default value is used. To delete
+                    immediately, set wait to 0 with timedelta().
             """
 
-            wait = wait or self.model.delete_wait
-            self.update(delete_after=timezone.now() + wait)
+            if wait is None:
+                wait = self.model.delete_wait
 
-    objects = models.Manager.from_queryset(QuerySet)()
+            if wait == timedelta():
+                super().delete()
+            else:
+                self.update(delete_after=timezone.now() + wait)
 
-    # Type hints for Django's runtime-generated fields.
-    id: int
-    pk: int
-    DoesNotExist: t.Type[ObjectDoesNotExist]
+    objects = models.Manager.from_queryset(QuerySet)()
 
     # Default for how long to wait before a model is deleted.
     delete_wait = timedelta(days=3)
@@ -89,18 +105,26 @@ class Meta(TypedModelMeta):
     # pylint: disable-next=arguments-differ
     def delete(  # type: ignore[override]
         self,
+        *args,
         wait: t.Optional[timedelta] = None,
+        **kwargs,
     ):
         """Schedules the deletion of this model.
 
         Args:
             wait: How long to wait before this model is deleted. If not set, the
-                class-level default value is used.
+                class-level default value is used. To delete immediately, set
+                wait to 0 with timedelta().
         """
 
-        wait = wait or self.delete_wait
-        self.delete_after = timezone.now() + wait
-        self.save()
+        if wait is None:
+            wait = self.delete_wait
+
+        if wait == timedelta():
+            super().delete(*args, **kwargs)
+        else:
+            self.delete_after = timezone.now() + wait
+            self.save(*args, **kwargs)
 
 
-AnyModel = t.TypeVar("AnyModel", bound=AbstractModel)
+AnyWarehouseModel = t.TypeVar("AnyWarehouseModel", bound=WarehouseModel)
diff --git a/codeforlife/tests/model.py b/codeforlife/tests/model.py
index 7cf831a5..ff9941f1 100644
--- a/codeforlife/tests/model.py
+++ b/codeforlife/tests/model.py
@@ -7,11 +7,10 @@
 
 import typing as t
 
-from django.db.models import Model
 from django.db.utils import IntegrityError
 from django.test import TestCase
 
-AnyModel = t.TypeVar("AnyModel", bound=Model)
+from ..models import AnyModel, Model
 
 
 class ModelTestCase(TestCase, t.Generic[AnyModel]):
@@ -38,3 +37,18 @@ def assert_raises_integrity_error(self, *args, **kwargs):
         """
 
         return self.assertRaises(IntegrityError, *args, **kwargs)
+
+    def assert_does_not_exist(self, model_or_pk: t.Union[AnyModel, t.Any]):
+        """Asserts the model does not exist.
+
+        Args:
+            model_or_pk: The model itself or its primary key.
+        """
+
+        if isinstance(model_or_pk, Model):
+            with self.assertRaises(model_or_pk.DoesNotExist):
+                model_or_pk.refresh_from_db()
+        else:
+            model_class = self.get_model_class()
+            with self.assertRaises(model_class.DoesNotExist):
+                model_class.objects.get(pk=model_or_pk)
diff --git a/codeforlife/user/models/auth_factor.py b/codeforlife/user/models/auth_factor.py
index f304b49d..92bb556e 100644
--- a/codeforlife/user/models/auth_factor.py
+++ b/codeforlife/user/models/auth_factor.py
@@ -9,11 +9,11 @@
 from django.utils.translation import gettext_lazy as _
 from django_stubs_ext.db.models import TypedModelMeta
 
-from ...models import AbstractModel
+from ...models import WarehouseModel
 from . import user as _user
 
 
-class AuthFactor(AbstractModel):
+class AuthFactor(WarehouseModel):
     """A user's enabled authentication factors."""
 
     class Type(models.TextChoices):
diff --git a/codeforlife/user/models/class_student_join_request.py b/codeforlife/user/models/class_student_join_request.py
index 5ad38532..b13608c1 100644
--- a/codeforlife/user/models/class_student_join_request.py
+++ b/codeforlife/user/models/class_student_join_request.py
@@ -7,13 +7,13 @@
 
 # from django.db import models
 
-# from ...models import AbstractModel
+# from ...models import WarehouseModel
 # from . import klass as _class
 # from . import student as _student
 
 
 # # TODO: move to portal
-# class ClassStudentJoinRequest(AbstractModel):
+# class ClassStudentJoinRequest(WarehouseModel):
 #     """A request from a student to join a class."""
 
 #     klass: "_class.Class" = models.ForeignKey(
diff --git a/codeforlife/user/models/klass.py b/codeforlife/user/models/klass.py
index c2b014a8..13145a55 100644
--- a/codeforlife/user/models/klass.py
+++ b/codeforlife/user/models/klass.py
@@ -13,13 +13,13 @@
 from django.utils.translation import gettext_lazy as _
 from django_stubs_ext.db.models import TypedModelMeta
 
-from ...models import AbstractModel
+from ...models import WarehouseModel
 from . import school as _school
 from . import student as _student
 from . import teacher as _teacher
 
 
-class Class(AbstractModel):
+class Class(WarehouseModel):
     """A collection of students owned by a teacher."""
 
     pk: str  # type: ignore[assignment]
diff --git a/codeforlife/user/models/otp_bypass_token.py b/codeforlife/user/models/otp_bypass_token.py
index eefea93d..3f8de656 100644
--- a/codeforlife/user/models/otp_bypass_token.py
+++ b/codeforlife/user/models/otp_bypass_token.py
@@ -15,11 +15,11 @@
 from django.utils.translation import gettext_lazy as _
 from django_stubs_ext.db.models import TypedModelMeta
 
-from ...models import AbstractModel
+from ...models import WarehouseModel
 from . import user as _user
 
 
-class OtpBypassToken(AbstractModel):
+class OtpBypassToken(WarehouseModel):
     """
     A one-time-use token that a user can use to bypass their OTP auth factor.
     Each user has a limited number of OTP-bypass tokens.
@@ -80,7 +80,7 @@ def key(otp_bypass_token: OtpBypassToken):
             return super().bulk_create(otp_bypass_tokens, *args, **kwargs)
 
     objects: Manager = Manager.from_queryset(  # type: ignore[misc]
-        AbstractModel.QuerySet
+        WarehouseModel.QuerySet
     )()  # type: ignore[assignment]
 
     user: "_user.User" = models.ForeignKey(  # type: ignore[assignment]
diff --git a/codeforlife/user/models/school.py b/codeforlife/user/models/school.py
index e8c92bbd..f3ad70e1 100644
--- a/codeforlife/user/models/school.py
+++ b/codeforlife/user/models/school.py
@@ -11,14 +11,14 @@
 from django.utils.translation import gettext_lazy as _
 from django_stubs_ext.db.models import TypedModelMeta
 
-from ...models import AbstractModel
+from ...models import WarehouseModel
 from ...models.fields import Country, UkCounty
 from . import klass as _class
 from . import student as _student
 from . import teacher as _teacher
 
 
-class School(AbstractModel):
+class School(WarehouseModel):
     """A collection of teachers and students."""
 
     # pylint: disable-next=missing-class-docstring
@@ -26,7 +26,7 @@ class Manager(models.Manager["School"]):
         pass
 
     objects: Manager = Manager.from_queryset(  # type: ignore[misc]
-        AbstractModel.QuerySet
+        WarehouseModel.QuerySet
     )()  # type: ignore[assignment]
 
     teachers: QuerySet["_teacher.Teacher"]
diff --git a/codeforlife/user/models/school_teacher_invitation.py b/codeforlife/user/models/school_teacher_invitation.py
index 91af711f..ff4e9dd6 100644
--- a/codeforlife/user/models/school_teacher_invitation.py
+++ b/codeforlife/user/models/school_teacher_invitation.py
@@ -11,7 +11,7 @@
 # from django.utils import timezone
 # from django.utils.translation import gettext_lazy as _
 
-# from ...models import AbstractModel
+# from ...models import WarehouseModel
 # from . import school as _school
 # from . import teacher as _teacher
 
@@ -21,7 +21,7 @@
 
 
 # # TODO: move to portal
-# class SchoolTeacherInvitation(AbstractModel):
+# class SchoolTeacherInvitation(WarehouseModel):
 #     """An invitation for a teacher to join a school."""
 
 #     school: "_school.School" = models.ForeignKey(
diff --git a/codeforlife/user/models/student.py b/codeforlife/user/models/student.py
index bf559ea1..a24b144b 100644
--- a/codeforlife/user/models/student.py
+++ b/codeforlife/user/models/student.py
@@ -13,13 +13,13 @@
 from django.utils.translation import gettext_lazy as _
 from django_stubs_ext.db.models import TypedModelMeta
 
-from ...models import AbstractModel
+from ...models import WarehouseModel
 from . import klass as _class
 from . import school as _school
 from . import user as _user
 
 
-class Student(AbstractModel):
+class Student(WarehouseModel):
     """A user's student profile."""
 
     # pylint: disable-next=missing-class-docstring
@@ -108,7 +108,7 @@ def bulk_create_users(
             return _user.User.objects.bulk_create(users, *args, **kwargs)
 
     objects: Manager = Manager.from_queryset(  # type: ignore[misc]
-        AbstractModel.QuerySet
+        WarehouseModel.QuerySet
     )()  # type: ignore[assignment]
 
     user: "_user.User"
diff --git a/codeforlife/user/models/teacher.py b/codeforlife/user/models/teacher.py
index 08d558e6..aa538826 100644
--- a/codeforlife/user/models/teacher.py
+++ b/codeforlife/user/models/teacher.py
@@ -12,14 +12,14 @@
 from django.utils.translation import gettext_lazy as _
 from django_stubs_ext.db.models import TypedModelMeta
 
-from ...models import AbstractModel
+from ...models import WarehouseModel
 from . import klass as _class
 from . import school as _school
 from . import student as _student
 from . import user as _user
 
 
-class Teacher(AbstractModel):
+class Teacher(WarehouseModel):
     """A user's teacher profile."""
 
     # pylint: disable-next=missing-class-docstring
@@ -40,7 +40,7 @@ def create_user(self, teacher: t.Dict[str, t.Any], **fields):
             )
 
     objects: Manager = Manager.from_queryset(  # type: ignore[misc]
-        AbstractModel.QuerySet
+        WarehouseModel.QuerySet
     )()  # type: ignore[assignment]
 
     user: "_user.User"
diff --git a/codeforlife/user/models/user.py b/codeforlife/user/models/user.py
index d4c1cba4..56214b61 100644
--- a/codeforlife/user/models/user.py
+++ b/codeforlife/user/models/user.py
@@ -21,7 +21,7 @@
 from django.utils.translation import gettext_lazy as _
 from django_stubs_ext.db.models import TypedModelMeta
 
-from ...models import AbstractModel
+from ...models import WarehouseModel
 from . import auth_factor as _auth_factor
 from . import otp_bypass_token as _otp_bypass_token
 from . import session as _session
@@ -29,7 +29,7 @@
 from . import teacher as _teacher
 
 
-class User(AbstractBaseUser, AbstractModel, PermissionsMixin):
+class User(AbstractBaseUser, WarehouseModel, PermissionsMixin):
     """A user within the CFL system."""
 
     USERNAME_FIELD = "email"
@@ -108,7 +108,7 @@ def create_superuser(self, password: str, first_name: str, **fields):
             return self._create_user(password, first_name=first_name, **fields)
 
     objects: Manager = Manager.from_queryset(  # type: ignore[misc]
-        AbstractModel.QuerySet
+        WarehouseModel.QuerySet
     )()  # type: ignore[assignment]
 
     session: "_session.Session"