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Package client holds the subscription module's client-application entity (the subscribe_application table): the client apps subscriptions are delivered to, with their templates and download links.

Package entitlement stores provider-authoritative subscription periods.

Package subscribe holds the subscription module's plan entities: the plans (the subscribe table) and their groups (subscribe_group).

Package usersub holds the subscription domain's user-subscription entities (ADR-001 step 5: entity packages follow table ownership).