Saving the notifications marker (/api/v1/markers) moved the marker but left
every notification unread, so a Mastodon client's unread count never fell.
The marker now marks read every notification up to it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw