Hirama666 here is an idea:
instead of colors, you can add a letter prefix:
- N for Not Yet
- P for Processing
- D for Done
It also makes me think what you need here is a Kanban board.
Have you tried KanBan? I personally use KanBoard: https://kanboard.org/
It is free software, just like RosarioSIS.
Here are you 3 states / 3 columns. Plus you can set a color for each task, assign a user and a date.
You can drag and drop each card when they change status.