🐛(backend) normalize raw S3 object keys

Correction to preserve already encoded plus signs in addition to slashes.

src/backend/core/recording/event/parsers.py

@@ -6,7 +6,7 @@ import re
 from dataclasses import dataclass
 from functools import lru_cache
 from typing import Any, Dict, Optional, Protocol
-from urllib.parse import quote_plus
+from urllib.parse import quote
 
 from django.conf import settings
 from django.utils.module_loading import import_string
@@ -165,8 +165,9 @@ class S3Parser(BaseS3Parser):
             if not filepath:
                 raise ParsingEventDataError("Missing object key name")
             filetype, _ = mimetypes.guess_type(filepath)
-            # Preserve already URL-encoded separators while encoding raw S3 object keys.
-            filepath = quote_plus(filepath, safe="%")
+            # Normalize raw S3-compatible object keys without re-encoding
+            # already encoded AWS S3 notification keys.
+            filepath = quote(filepath, safe="%+")
             return StorageEvent(
                 filepath=filepath,
                 filetype=filetype,