diff --git a/django_iban/__init__.py b/django_iban/__init__.py
index e69de29..d91d7cf 100644
--- a/django_iban/__init__.py
+++ b/django_iban/__init__.py
@@ -0,0 +1 @@
+default_app_config = 'django_iban.apps.IBANFieldConfig'
diff --git a/django_iban/apps.py b/django_iban/apps.py
new file mode 100644
index 0000000..4b514bc
--- /dev/null
+++ b/django_iban/apps.py
@@ -0,0 +1,48 @@
+from os.path                  import join
+from os.path                  import dirname
+from os.path                  import abspath
+from django.db                import connection
+from itertools                import chain
+from django.apps              import AppConfig
+from django.conf              import settings
+from django.db.models.signals import pre_migrate
+
+from django_iban.fields import IBANField
+
+
+class IBANFieldConfig(AppConfig):
+    name         = 'django_iban'
+    verbose_name = 'Django IBAN Field'
+
+    def ready(self):
+        pre_migrate.connect(self.enforce_database_constraint_callback)
+
+    def enforce_database_constraint_callback(self, sender, **kwargs):
+        database_backend = settings.DATABASES['default']['ENGINE']
+        enforcing_status = any([
+            iban_field.enforce_database_constraint
+            for iban_field in chain.from_iterable([
+                model._meta.fields for model in sender.get_models()])
+            if isinstance(iban_field, IBANField)])
+
+        if database_backend in (
+            'django.db.backends.postgresql_psycopg2',
+            'django.contrib.gis.db.backends.postgis'
+        ) and enforcing_status:
+            cursor    = connection.cursor()
+            base_path = dirname(abspath(__file__))
+
+            cursor.execute("select * from pg_available_extensions where name = 'plpythonu'")
+            if cursor.rowcount == 1:
+                cursor.execute(
+                    """
+                    SELECT p.proname FROM pg_catalog.pg_namespace n JOIN pg_catalog.pg_proc p
+                    ON p.pronamespace = n.oid
+                    WHERE n.nspname = 'public' AND p.proname = 'is_valid_iban';
+                    """)
+
+                if cursor.rowcount != 1:
+                    with open(join(base_path, 'pg_iban_validator.sql')) as iban_type_definition:
+                        cursor.execute(iban_type_definition.read())
+            else:
+                raise Exception('django_iban requested database enforcing but plpython extension not installed!')
diff --git a/django_iban/migrations/0001_initial.py b/django_iban/migrations/0001_initial.py
deleted file mode 100644
index aef64aa..0000000
--- a/django_iban/migrations/0001_initial.py
+++ /dev/null
@@ -1,31 +0,0 @@
-# -*- coding: utf-8 -*-
-from __future__ import unicode_literals
-
-from os.path     import join
-from os.path     import dirname
-from os.path     import abspath
-from django.db   import migrations
-from django.db   import connection
-from django.conf import settings
-
-
-def create_iban_type(*args, **kwargs):
-    database_backend = settings.DATABASES['default']['ENGINE']
-    if database_backend in (
-        'django.db.backends.postgresql_psycopg2',
-        'django.contrib.gis.db.backends.postgis'
-    ):
-        cursor    = connection.cursor()
-        base_path = dirname(dirname(abspath(__file__)))
-        cursor.execute("select * from pg_available_extensions where name = 'plpythonu'")
-        if cursor.rowcount == 1:
-            with open(join(base_path, 'pg_iban_validator.sql')) as iban_type:
-                cursor.execute(iban_type.read())
-
-
-class Migration(migrations.Migration):
-    dependencies = []
-
-    operations = [
-        migrations.RunPython(create_iban_type),
-    ]
diff --git a/django_iban/migrations/__init__.py b/django_iban/migrations/__init__.py
deleted file mode 100644
index e69de29..0000000