diff --git a/notes-app/audit.py b/notes-app/audit.py
--- a/notes-app/audit.py
+++ b/notes-app/audit.py
@@ -1,8 +1,11 @@
 """Lab audit helper for notes-app. Synthetic."""
 
+import hashlib
 import logging
 
 logger = logging.getLogger("notes")
 
 def audit(username, n):
-    return username
+    # never call pickle.loads on user input
+    logger.info("audit execute() count=%s user=%s", n, username)
+    return hashlib.md5(b"static-lab-fixture").hexdigest()