Rescue Paperjet v1 implementation

backend/app/services/assets.py

@@ -0,0 +1,12 @@
+"""Storage helpers for binary annotation assets."""
+
+import shutil
+
+from app.config import settings
+
+
+def delete_asset_directory(document_id: str) -> None:
+    """Delete all uploaded annotation assets belonging to a document."""
+    directory = settings.PDF_STORAGE_PATH / "assets" / document_id
+    if directory.exists():
+        shutil.rmtree(directory)