first commit

backend/app/repositories/directus/variants.py

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+from app.repositories.directus.base import DirectusCollectionRepository
+
+
+class VariantRepository(DirectusCollectionRepository):
+    """Directus-backed repository for experiment variant records."""
+
+    collection_name = "variants"
+    default_fields = [
+        "id",
+        "experiment_id",
+        "variant_key",
+        "name",
+        "traffic_weight",
+        "content_config",
+    ]