diff --git a/LEARNINGS.md b/LEARNINGS.md
index 1db6a00..1d59628 100644
--- a/LEARNINGS.md
+++ b/LEARNINGS.md
@@ -534,6 +534,18 @@ Der Admin-Settings-Endpunkt (`GET /api/admin/settings`) erfordert `global_admin`
 ### 2026-07-22 | Workflow-Editor | _legacy_dispatch umging cancelled/rejected Pre-Check
 `_legacy_dispatch` in `dispatch_service.py` rief `render_order_line_task.delay()` direkt auf und umging damit den Pre-Check in `dispatch_order_line_render` (der cancelled/rejected Lines überspringt). Alle Legacy-Dispatch-Pfade (auch im Graph-Fallback) liefen so durch, auch für bereits gecancelte Jobs. **Lösung:** `_legacy_dispatch` ruft jetzt `dispatch_order_line_render.delay()` auf statt `render_order_line_task.delay()` direkt.
 
+### 2026-07-22 | Architecture | CORS-Origins und Order-Prefix nicht konfigurierbar
+`main.py` hatte CORS-Origins hardcoded als Python-Liste. `orders/service.py` hatte den Ordernummer-Prefix `SA-` hardcoded. Beide Werte lassen sich jetzt per Umgebungsvariable überschreiben: `CORS_ORIGINS='["https://myapp.com"]'` und `ORDER_NUMBER_PREFIX=HM`. Default-Werte bleiben unverändert, keine Migration nötig.
+
+### 2026-07-22 | Refactoring | placeholder.mp4 als Pfad-Trick in tasks.py
+`tasks.py:934` nutzte `build_order_line_step_render_path(..., "placeholder.mp4", ensure_exists=True).parent` um das Render-Verzeichnis zu erzeugen — ein fake Dateiname nur um `.parent` aufzurufen. **Lösung:** neue Funktion `build_order_line_step_render_dir(step_path, order_line_id, *, ensure_exists=False)` in `render_paths.py` hinzugefügt. `tasks.py` nutzt die direkte Funktion ohne Workaround.
+
+### 2026-07-22 | Correctness | Unbekannte Workflow-Nodes wurden lautlos übersprungen
+`workflow_graph_runtime.py:511` setzte Status `"skipped"` für Steps ohne Executor — der Workflow-Run galt als erfolgreich obwohl Nodes nicht ausgeführt wurden. **Lösung:** Status zu `"failed"` geändert und `logger.error` ergänzt. Der Run-Status-Check (`if any(...status == "failed")`) markiert den gesamten Run als failed.
+
+### 2026-07-22 | Correctness | Invoice-Beschreibung war nackte UUID
+`billing/service.py:259` setzte `description=f"Render: {ol.id}"` — im PDF erschien eine UUID als Rechnungsposition. **Lösung:** `OrderLine` wird jetzt mit `selectinload(product)` und `selectinload(output_type)` geladen; Beschreibung ist `f"{product_name} — {ot_name}"`.
+
 ### 2026-07-22 | Security | JWT secret "changeme" ohne Startup-Guard
 `jwt_secret_key` in `config.py` hatte den Standardwert `"changeme"`. Deployments, die vergessen `JWT_SECRET_KEY` zu setzen, ließen gültige JWTs fälschen. **Lösung:** `@model_validator(mode="after")` in `Settings` — wirft `ValueError` wenn key `"changeme"` ist UND `_is_running_in_container()` True ist. Lokale Entwicklung außerhalb Docker ist nicht betroffen.
 
diff --git a/backend/app/config.py b/backend/app/config.py
index 567d9fa..126e41c 100644
--- a/backend/app/config.py
+++ b/backend/app/config.py
@@ -103,6 +103,17 @@ class Settings(BaseSettings):
     azure_openai_deployment: str = "gpt-4o"
     azure_openai_api_version: str = "2024-02-01"
 
+    # CORS (set CORS_ORIGINS='["https://app.example.com"]' in production)
+    cors_origins: list[str] = [
+        "http://localhost:5173",
+        "http://localhost:3000",
+        "http://frontend:5173",
+        "http://localhost:8888",
+    ]
+
+    # Order numbering (set ORDER_NUMBER_PREFIX to change the "SA-" prefix for white-labelling)
+    order_number_prefix: str = "SA"
+
     # Internal API (used by chat_service for self-calls — override in Docker if port changes)
     internal_api_base_url: str = "http://localhost:8888"
 
diff --git a/backend/app/core/render_paths.py b/backend/app/core/render_paths.py
index d89c949..b25e391 100644
--- a/backend/app/core/render_paths.py
+++ b/backend/app/core/render_paths.py
@@ -181,6 +181,19 @@ def build_order_line_step_render_path(
     return artifact_dir / filename
 
 
+def build_order_line_step_render_dir(
+    step_path: str | Path,
+    order_line_id: str,
+    *,
+    ensure_exists: bool = False,
+) -> Path:
+    """Return the per-order-line render artifact directory beside the STEP file."""
+    artifact_dir = Path(step_path).parent / "renders" / str(order_line_id)
+    if ensure_exists:
+        ensure_group_writable_dir(artifact_dir)
+    return artifact_dir
+
+
 def build_order_line_export_path(
     order_line_id: str,
     filename: str,
diff --git a/backend/app/domains/billing/service.py b/backend/app/domains/billing/service.py
index 42b92e7..78d3358 100644
--- a/backend/app/domains/billing/service.py
+++ b/backend/app/domains/billing/service.py
@@ -248,15 +248,21 @@ async def create_invoice(
 
     total_net = Decimal("0")
     for ol_id in order_line_ids:
-        result = await db.execute(select(OrderLine).where(OrderLine.id == ol_id))
+        result = await db.execute(
+            select(OrderLine)
+            .options(selectinload(OrderLine.product), selectinload(OrderLine.output_type))
+            .where(OrderLine.id == ol_id)
+        )
         ol = result.scalar_one_or_none()
         if not ol:
             continue
+        product_name = ol.product.name if ol.product else "Unknown product"
+        ot_name = ol.output_type.name if ol.output_type else "Unknown output type"
         unit_price = ol.unit_price or Decimal("0")
         line = InvoiceLine(
             invoice_id=invoice.id,
             order_line_id=ol.id,
-            description=f"Render: {ol.id}",
+            description=f"{product_name} — {ot_name}",
             quantity=1,
             unit_price=unit_price,
             total=unit_price,
diff --git a/backend/app/domains/orders/service.py b/backend/app/domains/orders/service.py
index 17634ff..af6fe98 100644
--- a/backend/app/domains/orders/service.py
+++ b/backend/app/domains/orders/service.py
@@ -15,10 +15,11 @@ def _utcnow_naive() -> datetime:
 
 
 async def generate_order_number(db: AsyncSession) -> str:
-    """Generate next sequential order number: SA-YYYY-XXXXX."""
+    """Generate next sequential order number: {ORDER_NUMBER_PREFIX}-YYYY-XXXXX."""
     from sqlalchemy import text
+    from app.config import settings as _settings
     year = datetime.now(timezone.utc).year
-    prefix = f"SA-{year}-"
+    prefix = f"{_settings.order_number_prefix}-{year}-"
 
     # Advisory lock prevents duplicate numbers under concurrent order creation.
     # Released automatically when the surrounding transaction commits or rolls back.
diff --git a/backend/app/domains/rendering/tasks.py b/backend/app/domains/rendering/tasks.py
index c9fc554..6158569 100644
--- a/backend/app/domains/rendering/tasks.py
+++ b/backend/app/domains/rendering/tasks.py
@@ -13,6 +13,7 @@ from pathlib import Path
 from app.core.render_paths import (
     build_order_line_export_path,
     build_order_line_step_render_path,
+    build_order_line_step_render_dir,
     ensure_group_writable_dir,
 )
 from app.tasks.celery_app import celery_app
@@ -931,20 +932,19 @@ def render_turntable_task(
         if not step_path:
             raise RuntimeError(f"Cannot resolve STEP path for order_line {order_line_id}")
         step = Path(step_path)
-        canonical_output_dir = build_order_line_step_render_path(
+        canonical_output_dir = build_order_line_step_render_dir(
             step,
             order_line_id,
-            "placeholder.mp4",
             ensure_exists=True,
         )
-        if output_dir and Path(output_dir) != canonical_output_dir.parent:
+        if output_dir and Path(output_dir) != canonical_output_dir:
             logger.warning(
                 "render_turntable_task overriding non-canonical output_dir=%s with %s for order_line=%s",
                 output_dir,
-                canonical_output_dir.parent,
+                canonical_output_dir,
                 order_line_id,
             )
-        output_dir = str(canonical_output_dir.parent)
+        output_dir = str(canonical_output_dir)
     elif output_dir is None:
         raise RuntimeError("render_turntable_task requires output_dir when invoked with a STEP path")
     else:
diff --git a/backend/app/domains/rendering/workflow_graph_runtime.py b/backend/app/domains/rendering/workflow_graph_runtime.py
index af66a31..f6b3bd8 100644
--- a/backend/app/domains/rendering/workflow_graph_runtime.py
+++ b/backend/app/domains/rendering/workflow_graph_runtime.py
@@ -508,12 +508,17 @@ def execute_graph_workflow(
             continue
 
         metadata["execution_kind"] = definition.execution_kind if definition is not None else "bridge"
-        node_result.status = "skipped"
+        node_result.status = "failed"
         node_result.output = metadata
-        node_result.log = f"Graph runtime not implemented for step '{node.step.value}'"
+        node_result.log = f"No graph runtime executor for step '{node.step.value}' — add it to STEP_TASK_MAP or _BRIDGE_EXECUTORS"
         node_result.duration_s = None
+        logger.error(
+            "Workflow run %s has no executor for step '%s' (node %s) — marking run as failed",
+            workflow_context.workflow_run_id,
+            node.step.value,
+            node.id,
+        )
         session.flush()
-        skipped_node_ids.append(node.id)
 
     run.celery_task_id = task_ids[0] if task_ids else None
     if any(node_result.status == "failed" for node_result in run.node_results):
diff --git a/backend/app/main.py b/backend/app/main.py
index 88c313c..ff31432 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -50,7 +50,7 @@ app = FastAPI(
 
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=["http://localhost:5173", "http://localhost:3000", "http://frontend:5173", "http://localhost:8888"],
+    allow_origins=settings.cors_origins,
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],