Wikibase interacts with different wikis ("sites") - identified by the "site ID".
For a number of reasons the site ID could be changed (e.g. `be_x_oldwiki` is intended to be referred to as `be_taraskwiki` - WMF Wikipedia).
It is not clear how does the change affects Wikibase. In the past certain functionality of Wikibase has not been working correctly after the change, e.g.
* langlinks API: T112426
* special:setsitelink does not recognize the new site ID as a valid input
Analyze and document the current behavior related to sitelinks/sites of Wikibase when the site is renamed (i.e. its site ID has been changed), This willl serve as a base for specifying what needs fixing etc.
**Note**: past investigation, linked to a potential ocean of other problematic cases was T112647
**Acceptance criteria:**
[] Overview of all known behavior related to sitelinks/sites in Wikibase
[] Document where the information on available/knows sites comes from currently
Timebox: TBD