MisterSynergy added a comment.
I came across some of these cases and thought the situation could require
some tidying, so I wrote a script which lists sitelinks to inexistent client
wiki pages in order to process them. Some patterns that I notice after closely
looking at dewiki, ptwiki, and cawiki:
- There are several hundred such cases for each of these three wikis; cawiki
is even clearly above 2000 cases. These sitelinks to inexistent pages are still
there in Wikidata, but I plan to remove them soon.
- Both "User does not exist at Wikidata" and "User is blocked at Wikidata"
are super rare scenarios that might not even be worth to worry about. In almost
all cases, neither of these is the case.
- The clear majority of cases are the result of "move without leaving a
redirect behind" actions on client wikis; deletions make up for a much smaller
number.
- Two patterns that happens surprisingly often:
- A user performs "move without leaving a redirect behind" on a redirect
page on a client wiki. I suppose the corresponding action on Wikidata fails
because redirects are not allowed as sitelinks.
- A user performs "move without leaving a redirect behind" on a client wiki
and the page is moved to another namespace. Is it intentional that the
corresponding action on Wikidata fails, or does it happen by accident? In some
cases, it would indeed be better to remove the sitelink rather than updating
it, e.g. when a page is moved from main to user namespace in the client wiki.
There are still plenty of cases which cannot be explained in any of these
ways. Maybe "Wikidata is read-only" at the moment of the edit can also lead to
missed sitelink updates.
TASK DETAIL
https://phabricator.wikimedia.org/T143486
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To: MisterSynergy
Cc: MisterSynergy, Mike_Peel, Bencemac, ARR8, abian, Nikki, matej_suchanek,
Lydia_Pintscher, NicoScribe, Ladsgroup, PokestarFan, ArthurPSmith,
Liuxinyu970226, Izno, hoo, Aklapper, Esc3300, Invadibot, maantietaja,
Akuckartz, Nandana, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer,
_jensen, rosalieper, Scott_WUaS, Wikidata-bugs, aude, Mbch331
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