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The thing that always stops me from making something similar to this (other than willpower and interest) is: how do you enforce constraints on the data? How do you keep it from accumulating junk data if you're cutting out the role of an application validating it?

It could be that this is really only for directly-mapped CRUD data, but I haven't seen a lot of applications out there that don't require at least a little bit of integrity checking.

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Which kind of junk data do you mean? We have quite a few constraints based on fields, so a number field will only accept integers/decimals and it's validated backend. We also have a regex system that is validated backend, so you can force user input for a particular field to conform to it.

We're working on adding custom Javascript scripting partially for this purpose. The idea is to set scripts that will run at different parts of the submission process. For example, one script runs for the submission page and you can control the frontend. Another would run backend in sandboxed NodeJS with custom validation rules on each new submission.

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