Back end where you just define schema, access policy, and functions

Would you use a backend where you just define schema, access policy, and functions?

Basically something like making smart contracts on EVM, but instead they run on a hyperscaler, and have regular backend fundamentals.

Here's a mock frenchie made me, was thinking something like this:

schema User { email: string @private(owner) name: string @public balance: number @private(owner, admin) }

policy { User.read: owner OR role("admin") User.update.balance: role("admin") }

function transfer(from: User, to: User, amount: number) { assert(caller == from.owner OR caller.role == "admin") assert(from.balance >= amount) from.balance -= amount to.balance += amount }

Was playing with OpenFGA, and AWS Lambda stuff, and got me thinking about this.

So you would "deploy" this contract on a hyperscaler, which then let's users access it from your lean js front-end, via something like this:

const res = await fetch("https://api.hyperscaler-example.com/c/your-contract-id/transfer", { method: "POST", headers: { "Authorization": "Bearer <user-jwt>", "Content-Type": "application/json" }, body: JSON.stringify({ from: "user_abc", to: "user_xyz", amount: 50 }) });

The runtime resolves the caller identity from the JWT, checks the policy rules, runs the function, handles the encryption/decryption of fields and so your frontend never touches any of that.

That's it, would you use it? Is there something that does this exactly already? Feeling like building this.