Why it matters

Tenant migration handles growth and tier changes. Getting it wrong = data loss or downtime.

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The architecture

Dual-write to old + new.

Backfill history.

Cut reads; verify; delete old.

Tenant migration flowDual-writeold + new shardBackfillhistory to newCut readsverify + cleanupDual-write + backfill + cutover is the safe migration playbook
Tenant migration flow.
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How it works end to end

Dual-write for hours.

Backfill history.

Cut reads; verify data.