Under the hood, off the hot path: how D1 scales to millions of databases
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What happened
Traditional database architecture assumes you have one or two big database clusters per application, usually accompanied by a connection pooling solution. AI-assisted development and vibe coding platforms turn this model inside out and are driving applications toward many small databases: one per user, application, preview environment, or tenant. That model fits D1 particularly well. D1 is Cloudflare's managed, serv…
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