4087. Replication & HA: delayed-replica verification — Harden the workflow against privilege or data-exposure risks. — SaaS — Laravel Query Builder
Scenario: A SaaS application must handle delayed-replica verification. Harden the workflow against privilege or data-exposure risks. Explain the invariant, SQL strategy, transaction/locking behavior, failure handling, observability and test plan. Use MySQL 8-oriented syntax where applicable.
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