fix: skip render for cancelled order lines and rejected orders

Adds early-exit checks in dispatch_order_line_render and
render_order_line_task to prevent rendering when order lines are
cancelled or the parent order is rejected/completed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/domains/pipeline/tasks/render_order_line.py

@@ -16,6 +16,30 @@ logger = logging.getLogger(__name__)
 @celery_app.task(name="app.tasks.step_tasks.dispatch_order_line_render", queue="step_processing")
 def dispatch_order_line_render(order_line_id: str):
     """Route an order-line render to render_order_line_task."""
+    # Pre-check: skip if line is already cancelled or order is rejected
+    from sqlalchemy import create_engine, select
+    from sqlalchemy.orm import Session
+    from app.config import settings as app_settings
+    from app.models.order_line import OrderLine
+    from app.domains.orders.models import Order, OrderStatus
+
+    sync_url = app_settings.database_url.replace("+asyncpg", "")
+    engine = create_engine(sync_url)
+    with Session(engine) as session:
+        line = session.execute(
+            select(OrderLine).where(OrderLine.id == order_line_id)
+        ).scalar_one_or_none()
+        if line and line.render_status == "cancelled":
+            logger.info(f"OrderLine {order_line_id} cancelled — not dispatching")
+            return
+        if line:
+            order = session.execute(
+                select(Order).where(Order.id == line.order_id)
+            ).scalar_one_or_none()
+            if order and order.status in (OrderStatus.rejected, OrderStatus.completed):
+                logger.info(f"OrderLine {order_line_id}: order {order.status.value} — not dispatching")
+                return
+
     logger.info(f"Dispatching render for order line: {order_line_id}")
     render_order_line_task.delay(order_line_id)
 
@@ -67,6 +91,28 @@ def render_order_line_task(self, order_line_id: str):
                 logger.error(f"OrderLine {order_line_id} not found")
                 return
 
+            # Skip if line was cancelled or order was rejected/completed
+            if line.render_status == "cancelled":
+                emit(order_line_id, "Order line already cancelled — skipping render")
+                logger.info(f"OrderLine {order_line_id} cancelled — skipping")
+                return
+
+            from app.domains.orders.models import Order, OrderStatus
+            order = session.execute(
+                select(Order).where(Order.id == line.order_id)
+            ).scalar_one_or_none()
+            if order and order.status in (OrderStatus.rejected, OrderStatus.completed):
+                emit(order_line_id, f"Order {order.status.value} — skipping render")
+                logger.info(f"OrderLine {order_line_id}: order {order.status.value} — skipping")
+                if line.render_status in ("pending", "processing"):
+                    session.execute(
+                        sql_update(OrderLine)
+                        .where(OrderLine.id == line.id)
+                        .values(render_status="cancelled")
+                    )
+                    session.commit()
+                return
+
             if line.product.cad_file_id is None:
                 emit(order_line_id, "Product has no CAD file — marking as failed", "error")
                 logger.warning(f"OrderLine {order_line_id}: product has no CAD file")