Programmable Multi-Tenant Subscription Engine

Design a backend service that manages feature access for a SaaS product. The system must support different tiers (Basic, Pro, Enterprise), custom per-customer overrides, and regional restrictions. A feature might be limited by a quota (e.g., 500 emails/month) or a boolean toggle. Developers should be able to check 'canUserAccessFeature(userId, featureId)' efficiently. The system must handle 'promotional' windows where certain features become free for a limited time.

Key concepts

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