Message search API returns 503, search silently only covers loaded messages

how to reproduce:

1. open any server channel (I used Flackle x Discord Connector Beta → #announcements)

2. open dev tools → Network tab

3. type anything in “Search messages…” and press Enter

expected: the search request succeeds and searches the whole channel history, or the UI shows an error if it fails.

actual: POST /api/servers/{server}/channels/{channel}/messages/search returns 503 every time. The UI doesn’t show an error. It still says “N results”, so it looks like it falls back to only the messages already loaded in the client. Older messages that aren’t loaded can’t be found, and users won’t know the search failed. This is probably also why search is case-sensitive (separate post).

browser: Brave (Chromium 155) on Windows 11