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Hosted database SaaS, with the (free) library somehow integrated.

What is the unique thing they offer that no other company can offer?

Prisma, being the most popular ORM at the moment, gives you a lot of leverage and opportunities for vertical integration

More popular than Hibernate and Entity Framework (both free)?

I doubt it.

Popular in the Typescript/Javascript world.

So basically, it's just a deployment-ready synergy provider?

Typescript code generation from db :)