diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index b34e854c0..7c977ce57 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -310,10 +310,20 @@ Please see the [activist style guide](https://github.com/activist-org/activist/b
 
 ### Backend
 
-Please run the following from the project root to test the backend:
+Please run the following commands from the project root to test the backend:
 
 ```bash
-pytest ./backend -vv
+# Start the Docker container:
+docker compose --env-file .env.dev up backend --build -d  # -d to hide logs
+
+# Enter the backend container:
+docker exec -it django_backend sh
+
+# Run backend tests:
+pytest
+
+# Once tests are finished:
+exit
 ```
 
 ### Frontend
diff --git a/README.md b/README.md
index 60c948dfa..db66a4ce4 100644
--- a/README.md
+++ b/README.md
@@ -203,7 +203,7 @@ git remote add upstream https://github.com/activist-org/activist.git
    ```bash
    docker compose --env-file .env.dev up
 
-   # Or with new dependencies:
+   # Or with new dependencies or backend model changes:
    # docker compose --env-file .env.dev up --build
 
    # And to stop the containers when you're done working:
diff --git a/backend/authentication/models.py b/backend/authentication/models.py
index fec4f9e72..5f1f3d18b 100644
--- a/backend/authentication/models.py
+++ b/backend/authentication/models.py
@@ -56,7 +56,7 @@ def create_user(
 
 
 class SupportEntityType(models.Model):
-    id = models.IntegerField(primary_key=True)
+    id = models.UUIDField(primary_key=True, default=uuid4, editable=False)
     name = models.CharField(max_length=255)
 
     def __str__(self) -> str:
diff --git a/backend/content/models.py b/backend/content/models.py
index dd9452701..a3ae69940 100644
--- a/backend/content/models.py
+++ b/backend/content/models.py
@@ -70,7 +70,7 @@ def __str__(self) -> str:
 
 
 class Tag(models.Model):
-    id = models.IntegerField(primary_key=True)
+    id = models.UUIDField(primary_key=True, default=uuid4, editable=False)
     text = models.CharField(max_length=255)
     creation_date = models.DateTimeField(auto_now_add=True)
 
diff --git a/backend/entities/factories.py b/backend/entities/factories.py
index 13f8628fd..2bcf69b1b 100644
--- a/backend/entities/factories.py
+++ b/backend/entities/factories.py
@@ -2,8 +2,6 @@
 
 import factory
 
-from authentication.models import UserModel
-
 from .models import (
     Group,
     GroupEvent,
@@ -35,14 +33,15 @@ class Meta:
     name = factory.Faker("word")
     tagline = factory.Faker("word")
     social_links = ["https://www.instagram.com/activist_org/"]
-
-    @factory.lazy_attribute
-    def created_by(self):
-        if UserModel.objects.exclude(username="admin").exists():
-            return UserModel.objects.exclude(username="admin").first()
-        else:
-            return factory.SubFactory("authentication.factories.UserFactory")
-
+    # Note: Version that accesses the database so we don't create new each time.
+    # created_by = factory.LazyAttribute(
+    #     lambda x: (
+    #         UserModel.objects.exclude(username="admin").first()
+    #         if UserModel.objects.exclude(username="admin").exists()
+    #         else factory.SubFactory("authentication.factories.UserFactory")
+    #     )
+    # )
+    created_by = factory.SubFactory("authentication.factories.UserFactory")
     status = factory.SubFactory("entities.factories.StatusTypeFactory", name="Active")
     is_high_risk = factory.Faker("boolean")
     location = factory.Faker("city")
@@ -59,14 +58,7 @@ class Meta:
     name = factory.Faker("word")
     tagline = factory.Faker("word")
     social_links = ["https://www.instagram.com/activist_org/"]
-
-    @factory.lazy_attribute
-    def created_by(self):
-        if UserModel.objects.exclude(username="admin").exists():
-            return UserModel.objects.exclude(username="admin").first()
-        else:
-            return factory.SubFactory("authentication.factories.UserFactory")
-
+    created_by = factory.SubFactory("authentication.factories.UserFactory")
     creation_date = factory.LazyFunction(
         lambda: datetime.datetime.now(tz=datetime.timezone.utc)
     )
diff --git a/backend/entities/models.py b/backend/entities/models.py
index d366d3d29..56bbd64b5 100644
--- a/backend/entities/models.py
+++ b/backend/entities/models.py
@@ -158,7 +158,7 @@ def __str__(self) -> str:
 
 
 class OrganizationApplicationStatus(models.Model):
-    id = models.IntegerField(primary_key=True)
+    id = models.UUIDField(primary_key=True, default=uuid4, editable=False)
     status_name = models.CharField(max_length=255)
 
     def __str__(self) -> str:
diff --git a/backend/events/factories.py b/backend/events/factories.py
index 49e3b34ac..d23368c9f 100644
--- a/backend/events/factories.py
+++ b/backend/events/factories.py
@@ -3,8 +3,6 @@
 
 import factory
 
-from authentication.models import UserModel
-
 from .models import (
     Event,
     EventAttendee,
@@ -39,14 +37,7 @@ class Meta:
             datetime.datetime.now(tz=datetime.timezone.utc) + datetime.timedelta(days=1)
         )
     )
-
-    @factory.lazy_attribute
-    def created_by(self):
-        if UserModel.objects.exclude(username="admin").exists():
-            return UserModel.objects.exclude(username="admin").first()
-        else:
-            return factory.SubFactory("authentication.factories.UserFactory")
-
+    created_by = factory.SubFactory("authentication.factories.UserFactory")
     creation_date = factory.LazyFunction(
         lambda: datetime.datetime.now(tz=datetime.timezone.utc)
     )
diff --git a/backend/events/models.py b/backend/events/models.py
index 8317857a3..7814b0a98 100644
--- a/backend/events/models.py
+++ b/backend/events/models.py
@@ -41,7 +41,7 @@ def __str__(self) -> str:
 
 
 class Format(models.Model):
-    id = models.IntegerField(primary_key=True)
+    id = models.UUIDField(primary_key=True, default=uuid4, editable=False)
     name = models.CharField(max_length=255)
     description = models.TextField(max_length=500)
     creation_date = models.DateTimeField(auto_now_add=True)
@@ -53,7 +53,7 @@ def __str__(self) -> str:
 
 
 class Role(models.Model):
-    id = models.IntegerField(primary_key=True)
+    id = models.UUIDField(primary_key=True, default=uuid4, editable=False)
     name = models.CharField(max_length=255)
     is_custom = models.BooleanField(default=False)
     description = models.TextField(max_length=500)
@@ -81,7 +81,7 @@ def __str__(self) -> str:
 
 
 class EventAttendeeStatus(models.Model):
-    id = models.IntegerField(primary_key=True)
+    id = models.UUIDField(primary_key=True, default=uuid4, editable=False)
     status_name = models.CharField(max_length=255)
 
     def __str__(self) -> str: