Persist-first client reads: previews carry persisted ids, refreshes wait for the in-flight persist#122

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ThbPS wants to merge 8 commits into

fix/serialize-opc-ajax-per-cartfrom

feat/persist-first-address-reads

Commits on Jul 15, 2026

fix(checkout): serialize OPC ajax requests per cart with a MySQL advisory lock

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fix(checkout): make the temp-address pointer restore a compare-and-swap

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fix(carrier): mirror invoice onto delivery only on an explicit use_same_address

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fix(checkout): single-flight the inline-address autosaves instead of aborting

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fix(checkout): namespace the per-cart lock by database and prefix

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test(integration): pin the CAS restore and the explicit use_same_address contracts

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fix(checkout): build the lock name inside the degrade guard

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feat(checkout): persist-first client — previews carry persisted ids, fetches wait for the in-flight persist

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