Expansion to cover full data models

[AlvaroEzquerro]

Hi. I was wondering if anyone has suggested this before. Add an extension to the current DataFrame schemas to a complete Data Model schema. This new schema would be similar to a database relational schema, in which, apart from validating tables, you can also validate relationships between tables. For example, foreign keys, cardinality of relationships, or custom Checks between different tables. I've searched the idea and I haven't found any library that does this with the same quality as Pandera. What do you think? Is it a good idea? Is there any library that I've missed that does that?