harden delivery pipeline and production runtime

app/ha/client.py

@@ -31,10 +31,13 @@ class HaClient:
             "Content-Type": "application/json",
         })
 
+    def close(self) -> None:
+        self._session.close()
+
     def list_entities(self) -> list[dict[str, object]]:
         try:
             response = self._session.get(
-                f"{self._settings.url}/api/states",
+                f"{self._settings.url.rstrip('/')}/api/states",
                 timeout=self._settings.timeout_seconds,
             )
         except requests.Timeout as exc:
@@ -71,4 +74,4 @@ class HaClient:
                 "Antwort von Home Assistant hat unerwartetes Format."
             )
 
-        return payload
+        return payload

app/ha/reader.py

@@ -15,9 +15,10 @@ class HaReader:
         entities = self._client.list_entities()
         summaries: list[HaEntitySummary] = []
         for item in entities:
-            entity_id = item.get("entity_id", "")
-            if "." not in entity_id:
+            raw_entity_id = item.get("entity_id")
+            if not isinstance(raw_entity_id, str) or "." not in raw_entity_id:
                 continue
+            entity_id = raw_entity_id
             domain = entity_id.split(".", 1)[0]
             raw_attributes = item.get("attributes") or {}
             attributes: dict[str, Any] = raw_attributes if isinstance(raw_attributes, dict) else {}