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xarmian
7ef4506cfa
When the browser tab lost focus and regained it, 5 independent onTabResume callbacks all fired simultaneously, flooding the server with redundant requests. This replaces that pattern with a 4-layer sync architecture: 1. Replay buffer — per-workspace ring buffer stores recent events with monotonic IDs. On SSE reconnect, missed events are replayed via Last-Event-ID so the client is already caught up. 2. Last-Event-ID support — SSE handler reads the header, replays from buffer, or sends sync_required if the gap is too large. 3. Incremental sync — new /changes?since=<ms> endpoint returns only modified/deleted items since a timestamp, including archived items for view consistency. 4. Centralized sync coordinator — single decision tree replaces 5 scattered callbacks. Short absences skip sync entirely, SSE-covered gaps need no API calls, and full refresh is a last resort. Key robustness details: - Global event IDs via Redis INCR for multi-instance safety - Server-time cursors to avoid client clock skew - Safe cursor management (only advances on confirmed sync) - 9 new tests for replay buffer and event ID behavior Fixes BUG-26.