diff --git a/umap/migrations/0018_datalayer_uuid.py b/umap/migrations/0018_datalayer_uuid.py
index 9d0bbd23..6153b1e9 100644
--- a/umap/migrations/0018_datalayer_uuid.py
+++ b/umap/migrations/0018_datalayer_uuid.py
@@ -25,7 +25,9 @@ class Migration(migrations.Migration):
             field=models.UUIDField(default=uuid.uuid4, editable=False, null=True),
         ),
         migrations.RunPython(gen_uuid, reverse_code=migrations.RunPython.noop),
-        migrations.AlterField("datalayer", name="id", field=models.CharField(max_length=100, null=True)),
+        migrations.RunSQL("ALTER TABLE umap_datalayer DROP CONSTRAINT umap_datalayer_pkey"),
+        # migrations.RemoveConstraint("datalayer", "id"),
+        migrations.AlterField("datalayer", name="id", field=models.IntegerField(null=True, blank=True)),
         migrations.AlterField(
             model_name="datalayer",
             name="uuid",
diff --git a/umap/models.py b/umap/models.py
index 780aeb75..0a2fce84 100644
--- a/umap/models.py
+++ b/umap/models.py
@@ -375,6 +375,7 @@ class DataLayer(NamedModel):
         (OWNER, _("Owner only")),
     )
     uuid = models.UUIDField(unique=True, primary_key=True, default=uuid.uuid4, editable=False)
+    id = models.IntegerField(null=True, blank=True)
     map = models.ForeignKey(Map, on_delete=models.CASCADE)
     description = models.TextField(blank=True, null=True, verbose_name=_("description"))
     geojson = models.FileField(upload_to=upload_to, blank=True, null=True)