A cascade is not an unlink. For UO the link lives on the shard (the
site's shard_account_links is a mirror), so dropping the mirror alone
would leave the shard attributing the game account to a deleted user.
- AD10: the hook is onUserDeleting and runs before the delete; each
module calls its own unlink for every link (Rust: links.unlinkOwned;
UO: the sidecar's DELETE /link/{account}, as the staff unlink does).
- AD11: an unlink that can't finish never holds up the deletion. A shard
that is offline queues into shard_pending_unlinks, retried on
reconnect. A protected staff account (403) is listed for admins as
"still linked on the shard".
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY
wtclaude
fc3f0ed296