Readonlystore: OutboxStoreEntryThe one store every write and the relay use.
Optional Readonlystores?: neverOptional Readonlystore?: neverReadonlystores: Readonly<Record<string, OutboxStoreEntry>>A store per tenant id, selected by the tenantId a call names.
The outbox option arm: ONE store (column isolation — the tenant, when any, is recorded in the row), or per-tenant
stores(database per tenant). Supplying both is a compile error.