diff --git a/src/cache.py b/src/cache.py
index 315ecdb..f14ce43 100644
--- a/src/cache.py
+++ b/src/cache.py
@@ -87,6 +87,7 @@ class Cache:
         self._data[provider][conv_id] = {
             "title": metadata.get("title", ""),
             "project": metadata.get("project"),
+            "created_at": metadata.get("created_at", ""),
             "updated_at": metadata.get("updated_at", ""),
             "exported_at": datetime.now(tz=timezone.utc).isoformat(),
             "file_path": metadata.get("file_path", ""),