When container restarts, backend resets to default 5s interval but frontend still shows the user's stored preference from localStorage. Now on SSE connect, frontend pushes its stored refresh rate to the backend, ensuring they stay in sync after container rebuilds. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>