Similar to UML of tables, there is no clear description of table logics for non-expert users.

We should document this

What we need:

• Table description & logic (docs: Improves README and documentation #227)
• Event lifecycle (docs: Improves README and documentation #227)
• Table UML diagram (docs: Added table UML in the README #228)
• [docs] Added explanations about access management in the API #168
• External services (storage, DB) (docs: Improves README and documentation #227)
• [docs] Add more accessible information about how to run & contribute #221
• docs: Revamped client README #225
• [db] Improve documentation about DB migration #230