debug: add POST test endpoint

backend/routers/prompts.py

@@ -30,9 +30,14 @@ from placeholder_resolver import (
 OPENROUTER_KEY = os.getenv("OPENROUTER_API_KEY")
 OPENROUTER_MODEL = os.getenv("OPENROUTER_MODEL", "anthropic/claude-sonnet-4")
 
-router = APIRouter(prefix="/api/prompts", tags=["prompts"])
+router = APIRouter(prefix=”/api/prompts”, tags=[“prompts”])
 
-# Metadaten-Schlüssel in workflow aggregate_results (nicht als „einziger“ Nutzer-Output)
+@router.post(“/test-post”)
+def test_post(session: dict = Depends(require_auth)):
+    “””Simple POST test endpoint”””
+    return {“status”: “ok”, “method”: “POST”}
+
+# Metadaten-Schlüssel in workflow aggregate_results (nicht als „einziger” Nutzer-Output)
 _WORKFLOW_AGG_META_KEYS = frozenset({
     "combined_analysis",
     "all_signals",
@@ -1547,6 +1552,17 @@ async def execute_unified_prompt_stream(
                         )
                         conn.commit()
 
+                # Client (EventSource) wartet auf dieses Event; ohne Payload schließt der Stream
+                # und der Browser feuert onerror → „Connection to server lost“.
+                try:
+                    sse_payload = json.loads(json.dumps(result, default=str))
+                except (TypeError, ValueError):
+                    sse_payload = {"type": result.get("type", "unknown"), "error": "result_not_serializable"}
+                await event_queue.put({
+                    "type": "execution_complete",
+                    "result": sse_payload,
+                })
+
             except Exception as e:
                 # Queue error event
                 await event_queue.put({