The Wikibase client should access item data blobs directly, using the repository's page, revision and text tables (and External Store, if needed). Similarly, item_per_page should be accessed directly in the repo's database. This removes the need to maintain local copies of items and the mapping table in the client's database.
Keep in mind that for 3rd party wikis that can not access the repo's database directly, we will still need these local tables.
Version: unspecified
Severity: normal