Have you had experience working with databases that do not use a relational model?

Yes, I have experience working with non-relational databases such as MongoDB and Redis.

For example, MongoDB is a document-oriented database where data is stored in JSON-like documents. It is convenient for storing flexible and hierarchical data structures.

Redis is an in-memory key-value store, often used for caching and fast data processing.

Working with such databases requires understanding their features, such as the lack of strict schemas and query characteristics.