feat: add versioned research templates and alpha variants

backend/app/research/serialization.py

@@ -0,0 +1,12 @@
+"""Serialize UTC database timestamps consistently across PostgreSQL and SQLite."""
+
+from datetime import datetime, timezone
+
+from fastapi.encoders import jsonable_encoder
+
+
+def encode_snapshot(value):
+    return jsonable_encoder(
+        value,
+        custom_encoder={datetime: lambda item: item.replace(tzinfo=item.tzinfo or timezone.utc).isoformat()},
+    )