diff --git a/labs/core/migrations/0008_alter_variable_value_alter_variable_unique_together.py b/labs/core/migrations/0008_alter_variable_value_alter_variable_unique_together.py
new file mode 100644
index 0000000..42c352d
--- /dev/null
+++ b/labs/core/migrations/0008_alter_variable_value_alter_variable_unique_together.py
@@ -0,0 +1,22 @@
+# Generated by Django 5.1.5 on 2025-02-25 11:20
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("core", "0007_alter_model_provider_alter_variable_provider"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="variable",
+            name="value",
+            field=models.TextField(blank=True, null=True),
+        ),
+        migrations.AlterUniqueTogether(
+            name="variable",
+            unique_together={("provider", "name")},
+        ),
+    ]
diff --git a/labs/core/models.py b/labs/core/models.py
index 462f084..0887ae0 100644
--- a/labs/core/models.py
+++ b/labs/core/models.py
@@ -61,7 +61,7 @@ def choices(cls):
 class Variable(models.Model):
     provider = models.CharField(choices=ProviderEnum.choices())
     name = models.CharField(max_length=255)
-    value = models.TextField()
+    value = models.TextField(blank=True, null=True)
 
     @staticmethod
     def get_default_vectorizer_value():
@@ -93,6 +93,9 @@ def _default_vectorizer_value_validation(self):
 
     def __str__(self):
         return self.name
+    
+    class Meta:
+        unique_together = ("provider", "name")
 
 
 class Model(models.Model):