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WPB-29583: migrate user client index store to PostGreSQL - #5648
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The user_client_index copy loop can re-insert a row that dual-write traffic deleted while its scan page was in flight (no tombstones in the Cassandra clients set column, so no marker table — accepted race per the 5414 precedent). Document the window in the Migration.hs haddock together with the cutover reconciliation (rebuild the index from brig's authoritative clients table), and extend the config-options.md reconciliation note accordingly.
…gs, migration tests)
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https://wearezeta.atlassian.net/browse/WPB-29583
Stacked on #5647 (WPB-29574, client store) — both surface the same
clientsdata; merge order enforced by the base branch.Checklist
changelog.d