Are there any document that contains the mapping of Wikidata Data Model into a Wikibase relational schema?
I want know, for example, if Item is mapped to one relational table of MariaDB and Property to another one or if both are mapped to only one table (as Entity), if ItemDescriptions has a separate table, how many tables support the Statement structure, including references and qualifiers, which column datatype is used to represent an IRI, and so on. Or even if the entire model is stored as a JSON document, one for each entity.
https://www.mediawiki.org/wiki/Wikibase/DataModel https://doc.wikimedia.org/Wikibase/master/php/md_docs_topics_json.html