For non-logged-in users, the SSR prefetch was fetching subscriptions

for the default observer which was never used because the client-side
query is disabled for non-logged-in users.

This saves 1 API call per feed page visit by anonymous users.

🤖 Generated with [Claude Code](https://claude.com/claude-code

)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>