pixel: Use user id36 rather than user name.

r2/r2/lib/tracking.py

@@ -152,7 +152,7 @@ def get_srpath():
 def get_pageview_pixel_url():
     """Return a URL to use for tracking pageviews for the current request."""
     data = [
-        c.user.name if c.user_is_loggedin else "",
+        c.user._id36 if c.user_is_loggedin else "",
         get_srpath(),
         c.lang or "",
         c.cname,

scripts/traffic/decrypt_userinfo.c

@@ -125,7 +125,7 @@ int main(int argc, char** argv)
 
             switch (field_index) {
             case FIELD_USER:
-                /* we don't use the username; skip it */
+                /* we don't use the user id; skip it */
                 break;
             case FIELD_SRPATH:
                 fputc('\t', stdout);