diff --git a/drupal2spip_lal/base/routers.py b/drupal2spip_lal/base/routers.py
new file mode 100644
index 0000000..6d99423
--- /dev/null
+++ b/drupal2spip_lal/base/routers.py
@@ -0,0 +1,25 @@
+class Drupal2SPIPRouter:
+    def db_for_read(self, model, **hints):
+        if model._meta.app_label == 'drupal':
+            return 'drupal'
+        return None
+
+    def db_for_write(self, model, **hints):
+        return self.db_for_read(model, **hints)
+
+    def allow_relation(self, obj1, obj2, **hints):
+        """
+        We disallow cross db relations.
+        """
+        app1, app2 = obj1._meta.app_label, obj2._meta.app_label
+        if 'drupal' in [app1, app2]:
+            return app1 == app2
+        return None
+
+    def allow_migrate(self, db, app_label, model_name=None, **hints):
+        """
+        We disallow migrations for those db.
+        """
+        if db == 'drupal':
+            return False
+        return None
diff --git a/drupal2spip_lal/settings/base.py b/drupal2spip_lal/settings/base.py
index 36ccf41..c456d93 100644
--- a/drupal2spip_lal/settings/base.py
+++ b/drupal2spip_lal/settings/base.py
@@ -55,9 +55,15 @@ DATABASES = {
     'default': env.db(
         'DJANGO_DATABASE_URL',
         default='sqlite:///{}'.format(base_dir('sqlite.db')),
-    )
+    ),
+    'drupal': env.db_url(
+        'DRUPAL_DATABASE_URL',
+        default='sqlite:///{}'.format(base_dir('drupal.db')),
+    ),
 }
 
+DATABASE_ROUTERS = ['drupal2spip_lal.base.routers.Drupal2SPIPRouter']
+
 # URLS
 # ------------------------------------------------------------------------------
 # https://docs.djangoproject.com/en/stable/ref/settings/#root-urlconf