Selling through an outage: an offline POS queue with idempotent sync
How Inventra's till keeps selling when the network drops: an IndexedDB queue, clientRef idempotency keys backed by a unique partial index, and an honest look at negative stock.
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Designing an inventory ledger that can't oversell: append-only movements and FIFO cost layers in MongoDB
How Inventra keeps stock honest: an append-only movement ledger, conditional $inc guards inside transactions, FEFO/FIFO cost layers, and a test that fires 50 parallel reserves at 10 units.