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WPB-29575: migrate user key store to PostGreSQL - #5642
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…claimKeyImpl - Copy loop (Migration.hs) now calls Postgres.insertUserKeyIfAbsent (ON CONFLICT (key) DO NOTHING): a stale Cassandra snapshot must never clobber a newer Postgres row, e.g. a key reclaim after the row was copied. The dual-write mirror keeps ON CONFLICT DO UPDATE because it mirrors the unconditional Cassandra overwrite of insertKeyImpl. - DualWrite.ClaimKey delegates to the Cassandra claimKeyImpl instead of re-implementing its read-then-write, then mirrors the insert.
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https://wearezeta.atlassian.net/browse/WPB-29575
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