[BUDI-6813] Prune unused plugins from app metadata

[ConorWebb96]

This might actually be pretty tricky. When saving a screen, we would need to search all screens inside the app to see if a certain plugin is still in use. It's not feasible to read all screens and search them whenever any tiny component modification is made, so this probably needs implemented some other way.

It could probably be some sort of background job (if we have such a concept) which runs every day and checks whether all plugins defined in each apps "usedPlugins" array is indeed still used.

Other hooks could potentially be:

• On publish
• On app sync/acquire lock

But I think it definitely needs to be some less frequent event as it's going to be an expensive operation.

Importantly though, this error is harmless. It's simply trying to load a file which does not exist and you'll only see the error if you have the console open - there is nothing displayed to the user.

Original issue below:

Checklist

• [X] I have searched budibase discussions and github issues to check if my issue already exists

Hosting

• Self
  • Method: docker compose
  • Budibase Version: 2.4.42-alpha.2
  • App Version: 2.4.42-alpha.2

Describe the bug Deleted plugins which have been removed both from the app and the plugins area have a 404 console error.

To Reproduce Steps to reproduce the behavior:

1. Add any custom plugin
2. Use the plugin some where in an app.
3. Remove the plugin from the plugins area.
4. Delete the plugin that was used within your app
5. View the app page an error will appear saying the plugin isn't found

Expected behavior No 404 console error should appear when a plugin is remove and is no longer being used anywhere within an app.

Screenshots

_{From SyncLinear.com | BUDI-6813}

[carmas123]

At this moment if you install a plugin it is no longer possible to remove it otherwise you will always receive the 404 error.

If you install a plugin and then realize that it is not what you wanted, we cannot remove it even if it is not used in any screen.

Yesterday I tried to install SuperTable to do some tests and then I removed it from all the screens and uninstalled it, the result is that now I always have the 404 error in the console.

I also tried removing all the screens but without success.

I believe that this is a big problem also because if in the free version the limit is 10 plugins as you cannot remove them to avoid having the 404 the limit is reached very fast.

Questo è quello che esce nella console:

[aptkingston]

Hey @carmas123. You're right that you will get 404s in the console, but these are totally harmless as mentioned in the description. They do not affect app performance, have no effect on your plugin limit and are only visible when showing the console. I would like to fix them in a future update, but this isn't on the immediate roadmap.