diff --git a/gen/openapi_server/controllers/patchnotes_controller.py b/gen/openapi_server/controllers/patchnotes_controller.py
index 3803aea..09ba25c 100644
--- a/gen/openapi_server/controllers/patchnotes_controller.py
+++ b/gen/openapi_server/controllers/patchnotes_controller.py
@@ -127,8 +127,18 @@ def list_patchnotes(since: str | None = None):
 
     # 2) Wenn ?since fehlt, gespeichertes last_login holen
     if since is None:
-        rec = last_login_collection.find_one({"user_id": user_id})
-        since = rec["last_login"] if rec else None
+        try:
+            docs = list(collection.sort("patch_date", 1))
+            for d in docs:
+                d.pop("_id", None)
+                if isinstance(d["patch_date"], (datetime, date)):
+                    d["patch_date"] = d["patch_date"].isoformat()
+        except ValueError as e:
+            raise ProblemException(
+                title="Internal Server Error",
+                detail=str(e),
+                status=500,
+            )
 
     # 3) Datum validieren (nur wenn vorhanden)
     if since: