Design Relational Database - Use hierarchical datamodels or avoid them?

Question

I\'m designing a Database and I have some doubts on using Hierarchical datamodels in relational databases.

If I want to deal with categories, subcategories and paren

Answer 1

If you're using Postgres, you can store the hierarchy in an array as a materialized path.

You also benefit from GIN indexing with this approach, which in my experiments has had better performance than a recursive query.