Merge restoration policy into system message

router/ai_profile_router.py

@@ -1396,7 +1396,18 @@ def _inject_restoration_system_policy(data: dict, path: str) -> dict:
     if path == "/v1/chat/completions":
         messages = data.get("messages")
         if isinstance(messages, list):
-            messages.insert(0, {"role": "system", "content": policy})
+            # Qwen's chat template permits exactly one system message and it
+            # must be the first message.  The global router policy may already
+            # have created that message, so extend it instead of inserting a
+            # second system message in front of it.
+            if (messages and isinstance(messages[0], dict)
+                    and messages[0].get("role") == "system"
+                    and isinstance(messages[0].get("content"), str)):
+                existing = messages[0]["content"]
+                if policy not in existing:
+                    messages[0]["content"] = f"{policy}\n\n{existing}"
+            else:
+                messages.insert(0, {"role": "system", "content": policy})
     elif path == "/v1/responses":
         instructions = data.get("instructions")
         data["instructions"] = (