diff --git a/extensions/admin.py b/extensions/admin.py
index 37b99080..9813ca8f 100644
--- a/extensions/admin.py
+++ b/extensions/admin.py
@@ -202,8 +202,13 @@ class TagAdmin(admin.ModelAdmin):
             return ()
 
 
+class VersionPermissionAdmin(admin.ModelAdmin):
+    list_display = ('name', 'slug')
+
+
 admin.site.register(models.Extension, ExtensionAdmin)
 admin.site.register(models.Version, VersionAdmin)
 admin.site.register(models.Maintainer, MaintainerAdmin)
 admin.site.register(models.License, LicenseAdmin)
 admin.site.register(models.Tag, TagAdmin)
+admin.site.register(models.VersionPermission, VersionPermissionAdmin)
diff --git a/extensions/migrations/0028_alter_license_slug_alter_versionpermission_slug.py b/extensions/migrations/0028_alter_license_slug_alter_versionpermission_slug.py
new file mode 100644
index 00000000..5bf90ee1
--- /dev/null
+++ b/extensions/migrations/0028_alter_license_slug_alter_versionpermission_slug.py
@@ -0,0 +1,23 @@
+# Generated by Django 4.2.11 on 2024-05-06 12:10
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('extensions', '0027_unique_preview_files'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='license',
+            name='slug',
+            field=models.SlugField(help_text='Should be taken from https://spdx.org/licenses/', unique=True),
+        ),
+        migrations.AlterField(
+            model_name='versionpermission',
+            name='slug',
+            field=models.SlugField(help_text='Permissions add-ons are expected to need.', unique=True),
+        ),
+    ]
diff --git a/extensions/models.py b/extensions/models.py
index 33d274c7..8e94036e 100644
--- a/extensions/models.py
+++ b/extensions/models.py
@@ -19,8 +19,6 @@ from constants.base import (
     EXTENSION_TYPE_SLUGS,
     FILE_STATUS_CHOICES,
 )
-from constants.licenses import ALL_LICENSES
-from constants.version_permissions import ALL_VERSION_PERMISSIONS
 import common.help_texts
 import extensions.fields
 
@@ -90,22 +88,13 @@ class License(CreatedModifiedMixin, models.Model):
         blank=False,
         null=False,
         help_text='Should be taken from https://spdx.org/licenses/',
+        unique=True,
     )
     url = models.URLField(blank=False, null=False)
 
     def __str__(self) -> str:
         return f'{self.name}'
 
-    @classmethod
-    def generate(cls):
-        """Generate License records from constants."""
-        licenses = [cls(id=li.id, name=li.name, slug=li.slug, url=li.url) for li in ALL_LICENSES]
-        cls.objects.bulk_create(licenses)
-
-    @classmethod
-    def get_by_name(cls, name: str):
-        return cls.objects.filter(name__startswith=name).first()
-
     @classmethod
     def get_by_slug(cls, slug: str):
         return cls.objects.filter(slug__startswith=slug).first()
@@ -386,28 +375,16 @@ class VersionPermission(CreatedModifiedMixin, models.Model):
         blank=False,
         null=False,
         help_text='Permissions add-ons are expected to need.',
+        unique=True,
     )
     help = models.CharField(max_length=128, null=False, blank=False, unique=True)
 
     def __str__(self) -> str:
         return f'{self.name}'
 
-    @classmethod
-    def generate(cls):
-        """Generate Permission records from constants."""
-        permissions = [
-            cls(id=li.id, name=li.name, slug=li.slug, help=li.help)
-            for li in ALL_VERSION_PERMISSIONS
-        ]
-        cls.objects.bulk_create(permissions)
-
-    @classmethod
-    def get_by_name(cls, name: str):
-        return cls.objects.filter(name__startswith=name).first()
-
     @classmethod
     def get_by_slug(cls, slug: str):
-        return cls.objects.filter(slug__startswith=slug).first()
+        return cls.objects.get(slug=slug)
 
 
 class Tag(CreatedModifiedMixin, models.Model):
@@ -537,12 +514,7 @@ class Version(CreatedModifiedMixin, RatingMixin, TrackChangesMixin, models.Model
             return
 
         for permission_name in _permissions:
-            permission = VersionPermission.get_by_name(permission_name)
-
-            # Just ignore versions that are incompatible.
-            if not permission:
-                continue
-
+            permission = VersionPermission.get_by_slug(permission_name)
             self.permissions.add(permission)
 
     def set_initial_licenses(self, _licenses):
diff --git a/files/validators.py b/files/validators.py
index 0fb5c61f..c0d4f965 100644
--- a/files/validators.py
+++ b/files/validators.py
@@ -54,12 +54,11 @@ class FileMIMETypeValidator:
 
 
 class ExtensionIDManifestValidator:
-    """
-    Make sure the extension id is valid:
-      * Extension id consists of Unicode letters, numbers or underscores.
-      * Neither hyphens nor spaces are supported.
-      * Each extension id most be unique across all extensions.
-      * All versions of an extension must have the same extension id.
+    """Make sure the extension id is valid:
+    * Extension id consists of Unicode letters, numbers or underscores.
+    * Neither hyphens nor spaces are supported.
+    * Each extension id most be unique across all extensions.
+    * All versions of an extension must have the same extension id.
     """
 
     def __init__(self, manifest, extension_to_be_updated):
@@ -307,10 +306,11 @@ class PermissionsValidator:
             is_error = True
         else:
             for permission in value:
-                if VersionPermission.get_by_slug(permission):
-                    continue
-                is_error = True
-                logger.info(f'Permission unavailable: {permission}')
+                try:
+                    VersionPermission.get_by_slug(permission)
+                except VersionPermission.DoesNotExist:
+                    is_error = True
+                    logger.info(f'Permission unavailable: {permission}')
 
         if not is_error:
             return