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Embedded per-app DBs (shared:false) resolve to mariadb-on-NFS with no placement pin in swarm, which InnoDB does not support (locking, split-brain); embedded DBs are a compose-only pattern. After provisioning each swarm-test round's inventory, force shared:true on every svc-db-* provider service so consumers route to the central provider. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>