vikunja_user_count is not updated after successful API registration

[booxter]

Pre-submission checklist

• I have searched for existing open or closed issue reports with the same problem.

Description

vikunja_user_count does not update after successful user creation through the regular registration API.

I reproduced this on the public demo instance at https://try.vikunja.io:

1. GET /api/v1/metrics returned:
   vikunja_user_count 107
2. POST /api/v1/register succeeded with 200 OK
3. the response returned a newly created user:
   • username: codex-demo-reg-20260416-2356
   • id: 218
   • created: 2026-04-17T01:54:09+02:00
4. GET /api/v1/metrics still returned:
   vikunja_user_count 107
5. after waiting a few seconds, the metric was still unchanged

So the registration API creates the user successfully, but the metric does not reflect the new user count.

Vikunja Version

Public demo: v2.3.0-101-10ec3b55

I also investigated this locally against checkout 10ec3b55b01e083268747c15ee383059f6408695.

Browser and version

N/A

Can you reproduce the bug on the Vikunja demo site?

Yes

Screenshots

N/A

[booxter]

One note: I think there's a separate path to miss metrics update - through CLI that would need a different treatment from what I just posted in #2651

[vikunja-bot-app]

This issue has been fixed in 411ead4, please check with the next unstable build (should be ready for deployment in ~30min, also on the demo).