Update project files

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/routers/layouts.py

@@ -29,14 +29,52 @@ def _to_detail_response(layout: GraphLayout) -> GraphLayoutDetailResponse:
     )
 
 
+AUTOSAVE_NAME = "__autosave__"
+
+
 @router.get("", response_model=list[GraphLayoutResponse])
 def list_layouts(project_id: int | None = None, db: Session = Depends(get_db)):
-    query = db.query(GraphLayout)
+    query = db.query(GraphLayout).filter(GraphLayout.name != AUTOSAVE_NAME)
     if project_id is not None:
         query = query.filter(GraphLayout.project_id == project_id)
     return [_to_response(l) for l in query.order_by(GraphLayout.updated_at.desc()).all()]
 
 
+@router.get("/autosave", response_model=GraphLayoutDetailResponse)
+def get_autosave(db: Session = Depends(get_db)):
+    layout = db.query(GraphLayout).filter(GraphLayout.name == AUTOSAVE_NAME).first()
+    if not layout:
+        raise HTTPException(404, "No autosave layout found")
+    return _to_detail_response(layout)
+
+
+@router.put("/autosave", response_model=GraphLayoutDetailResponse)
+def upsert_autosave(data: GraphLayoutUpdate, db: Session = Depends(get_db)):
+    layout = db.query(GraphLayout).filter(GraphLayout.name == AUTOSAVE_NAME).first()
+    update_data = data.model_dump(exclude_unset=True)
+    if "node_positions" in update_data:
+        update_data["node_positions"] = json.dumps(update_data["node_positions"])
+    if "viewport" in update_data:
+        update_data["viewport"] = json.dumps(update_data["viewport"])
+
+    if layout:
+        for key, value in update_data.items():
+            setattr(layout, key, value)
+    else:
+        layout = GraphLayout(
+            name=AUTOSAVE_NAME,
+            description="Auto-saved working state",
+            node_positions=update_data.get("node_positions", "{}"),
+            viewport=update_data.get("viewport", "{}"),
+            is_default=False,
+        )
+        db.add(layout)
+
+    db.commit()
+    db.refresh(layout)
+    return _to_detail_response(layout)
+
+
 @router.get("/{layout_id}", response_model=GraphLayoutDetailResponse)
 def get_layout(layout_id: int, db: Session = Depends(get_db)):
     layout = db.get(GraphLayout, layout_id)