Why Realtime Events Should Be Hints, Not the Source of UI Truth

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A software engineer investigated a stale notification badge in an ASP.NET Core and Blazor app running across multiple server instances, where the displayed count sometimes failed to update despite correct underlying data. The root cause was over-reliance on realtime transport to maintain UI state, which breaks under common production conditions such as brief disconnections, load balancer routing, or transport failures after a successful database write. The fix separated responsibilities into three layers: committing durable state first, broadcasting a hint only on genuine new records, and adding periodic polling as a fallback reconciliation path. Placing the broadcast at a shared dispatch point — rather than a single UI workflow — ensured consistency across both interactive and background creation paths. The approach treats realtime events as signals that fresh data is available, while authoritative state is always recoverable from the server regardless of connection status.

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