I will commission to write (without using any framework) the simplest visualization handling and building a category tree using Cytoscape.js + php + mysql along with its presentation on a graph/diagram. Tree maintenance:
1. adding categories/subcategories
2) Edit links/change nesting in branch/change parent
Multiple trees on one screen
It's mainly about the code itself, base structure as simple as possible.
Sample solution to be customized: https://bumbu.me/cytoscape.js/debug/
Desired functionality (drawing a tree, branches and eyeballs) https://www.youtube.com/watch?v=1dov3T6ckLk&t=120s - this video perfectly illustrates the tree building functionality I want