If you intend to build the CRUD app with a programming language (opposed to a low-code or no-code tool), then PHP would be suitable.
At least half of HN will recoil in horror, but PHP was designed for web programming and nothing else. The standard library will have almost everything you need. Deployment is easier than many other languages. It can be as simple as uploading your PHP files to a folder located on your hosting provider.
"Something which is not easy to compromise or hack."
Well, this is dependent on the skill of the programmer and takes time to learn. The alternative is to pull in external dependencies i.e a framework that tackles security issues like authentication, database access etc. But learning to use a framework will also be a time sink (but less time-consuming that building from scratch).
"The closest I can think of is a static site generator with some kind of self-hosted database but I'm not aware of any."
Static Site Generators (SSG) do not use databases and would not be suitable for a dynamic CRUD app. Even a 'simple' task such as signing-in to your CRUD app (if needed) is not possible with a SSG unless you plug in an external dependency.
Remember, if you go down the low-code or no-code tool approach you'll always be tied to the low-code platform who will host your CRUD app.
At least half of HN will recoil in horror, but PHP was designed for web programming and nothing else. The standard library will have almost everything you need. Deployment is easier than many other languages. It can be as simple as uploading your PHP files to a folder located on your hosting provider.
"Something which is not easy to compromise or hack."
Well, this is dependent on the skill of the programmer and takes time to learn. The alternative is to pull in external dependencies i.e a framework that tackles security issues like authentication, database access etc. But learning to use a framework will also be a time sink (but less time-consuming that building from scratch).
"The closest I can think of is a static site generator with some kind of self-hosted database but I'm not aware of any."
Static Site Generators (SSG) do not use databases and would not be suitable for a dynamic CRUD app. Even a 'simple' task such as signing-in to your CRUD app (if needed) is not possible with a SSG unless you plug in an external dependency.
Remember, if you go down the low-code or no-code tool approach you'll always be tied to the low-code platform who will host your CRUD app.