diff --git a/sync/migrations/0008_alter_dataaccess_store_id.py b/sync/migrations/0008_alter_dataaccess_store_id.py
new file mode 100644
index 0000000..d89a922
--- /dev/null
+++ b/sync/migrations/0008_alter_dataaccess_store_id.py
@@ -0,0 +1,18 @@
+# Generated by Django 5.1 on 2025-06-26 12:20
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('sync', '0007_dataaccess_store_id'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='dataaccess',
+            name='store_id',
+            field=models.CharField(blank=True, default='', max_length=100, null=True),
+        ),
+    ]
diff --git a/sync/models/data_access.py b/sync/models/data_access.py
index b4019fa..bc2507c 100644
--- a/sync/models/data_access.py
+++ b/sync/models/data_access.py
@@ -17,7 +17,7 @@ class DataAccess(BaseModel):
     shared_with = models.ManyToManyField(settings.AUTH_USER_MODEL, related_name='shared_data')
     model_name = models.CharField(max_length=50)
     model_id = models.UUIDField()
-    store_id = models.CharField(max_length=100, default="") # a value matching LeStorage directory sub-stores. Matches the name of the directory.
+    store_id = models.CharField(max_length=100, default="", blank=True, null=True) # a value matching LeStorage directory sub-stores. Matches the name of the directory.
     granted_at = models.DateTimeField(auto_now_add=True)
 
     def delete_dependencies(self):
diff --git a/sync/serializers.py b/sync/serializers.py
index f37e6ba..a48fa58 100644
--- a/sync/serializers.py
+++ b/sync/serializers.py
@@ -6,9 +6,3 @@ class DataAccessSerializer(serializers.ModelSerializer):
         model = DataAccess
         fields = '__all__'
         read_only_fields = ['user']
-
-    def to_internal_value(self, data):
-        if 'store_id' in data and data['store_id'] is None:
-            data = data.copy()  # Don't modify the original data
-            data['store_id'] = ""
-        return super().to_internal_value(data)