How can I connect one DB to multiple vercel projects?

Neon seems to impose a 1-1 mapping between vercel projects and neon DBs. How can I connect one DB to multiple vercel projects?

We have one database but 3x projects in Vercel that all need to use it for preview branches and production.

As soon as I connect one project, it disconnects another.

You need a vercel integration like sentry does that lets you specify each vercel -> neon pairing. This single connection only is very prohibitive.

How can I fix without migrating to Vercel postgres?
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