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A single product identity is represented four ways across four DShop services - owner, replica, cart snapshot, order snapshot - each on its own refresh discipline, and nothing masters the set. Part 12 of Nine Services and a Message Bus.
DShop moves data between services two opposite ways - one rebuilds a local replica from the event payload, the other treats the event as a doorbell and fetches over HTTP - and the estate runs both at once. Part 5 of Nine Services and a Message Bus.
