Customizing the Next.js Data Cache with unstable_cache

Act as a Node.js Backend Optimizer. Provide a highly robust TypeScript implementation demonstrating the precise use of the Next.js `unstable_cache` API to securely wrap a heavy, latency-inducing [DATABASE_QUERY]. You must engineer a highly custom, deterministic [CACHE_KEY_LOGIC] array that dynamically injects specific environment variables, tenant IDs, and user contexts to prevent cache collision. Enforce a strict [REVALIDATION_INTERVAL] and provide a technical briefing explaining exactly how this function-level cache physically persists across Vercel deployments and how it interacts with the Next.js Full Route Cache.