Key Summary:
How local SQLite storage, optimistic background sync, and conflict resolution guarantee zero customer queues even during complete internet outages.
Internet Outages Must Never Halt Cash Registers
In high-volume retail, a 10-minute network hiccup results in abandoned shopping carts and frustrated patrons walking out.
The Three-Layer Offline Architecture
Local Embedded Storage: Every transaction is written immediately to a local IndexedDB or SQLite database with microsecond read/write latencies.
Background Event Queue: An asynchronous worker listens for network state changes and flushes pending transaction packets in chronological batches.
Deterministic Conflict Resolution: Server-side reconciliation handles stock allocation and sequential invoice numbering transparently.
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