bug fix for user_id in upload

app/cache.py

@@ -17,9 +17,8 @@ AWS_SECRET_KEY = os.getenv('AWS_SECRET_KEY')
 REGION = os.getenv('AWS_REGION')
 
 def upload_file_to_s3(filename):
-    # user_id = users\to_upload\da43883b-7e12-425f-b498-ac8665dd23fe.pkl extract everything before the first dot and the last \
-    # might be '/' on linux so extract everything after to_upload?
-    user_id = re.search(r'users\\to_upload\\(.*).pkl', filename).group(1)
+    # Extract user_id from the filename
+    user_id = os.path.basename(filename).split('.')[0]
     # user_id = filename.split('.')[0]
     print(user_id)
     function_name = upload_file_to_s3.__name__