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Expertise isn't there because people are outsourcing that sort of work to companies. I didn't know how to do much of anything, until I had to do it for work. Then learning everything became way easier.

Htmx has events you can listen to like htmx after response. You can think of it almost like a middleware. After the response comes in, your callback is triggered and you can make the callback look up some attribute given the calling parents attribute that you might call hx-json-key.

Yes you have to add this yourself, but you only need to add one js function once and be done with it.

I've used the callback pattern for custom error handling for all hx responses.

FYI I had a similar problem to yours in terms of having jobs I wanted to run on a schedule. I also had an extra layer where I wanted to let users to define jobs with their own special parameters etc. Maybe what I did is helpful for you:

- Form submission in front-end admin panel for users, for "new scheduled job"

- Form allows defining a job name, job type (while I let users define jobs, I limit it to a subset of python functions that I trust but are still general enough), job parameters (just a json blob for kwargs for the python func), frequency, and timeout.

- For the whitelisting of functions it's easiest to have a directory in your src which has the different python functions that are usable, and when you do a "get" for the form you populate the dropdown with the scripts from that directory / some metadata.

- The backend (fastAPI) saves the details in a DB and creates a CRON file for the job, to add to the crontab. I basically have a template bash statement with the timeout built in and logging hooked up to it. And when python functions are called I have a helper which grabs the JSON kwargs from the DB or a filecache (if remote DB and I don't want to hit it every minute or something) to avoid cmd line injection.

- Also have an "edit scheduled job" which opens the same form view but with items pre-populated, and the submit going to a patch endpoint instead of a post.

It's stupid simple but lets users define a range of jobs. Things like having daily backups, where to send the backups, pulling things from / pushing things to an API frequently, etc.