Reddit's homeserver returns 404 from /_matrix/client/v3/rooms/{id}/joined_members
for rooms we've left, been kicked from, or never fully joined — which is
roughly every chat that wasn't accepted by the recipient. The previous
enrichUsernames pass retried these on every delta sync, flooding the
dashboard log with debug-level 404s. Track failures in an in-memory
unresolvable set so each room is tried at most once per process.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
jjbruntonandClaude Opus 4.7
1df7b680ee