first commit

backend/app/repositories/directus/experiments.py

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+from app.repositories.directus.base import DirectusCollectionRepository
+
+
+class ExperimentRepository(DirectusCollectionRepository):
+    """Directus-backed repository for experiment content records."""
+
+    collection_name = "experiments"
+    default_fields = [
+        "id",
+        "site_id",
+        "experiment_key",
+        "name",
+        "module_type",
+        "status",
+        "start_at",
+        "end_at",
+        "targeting_config",
+    ]