CRUD, how-to

Still, I am missing a more useful CRUD example. I look at the docs, section Build your first application - not complete.  I look at the repo Playground - not complete. I google for tutorials and I search Youtube  - no result.

Could someone, please anywhere present code that covers a CRUD?

I like to see it handle (besides from the obvious stuff):

• various input, at especially "select"
  
• various validation examples
  
• error handling that approaches each input
  
• flash message on success/fail
  

It doesn't have to be in the docs. A Github repo would be enough in my opinion. I think that many new coders would appreciate this a lot.