https://bugzilla.wikimedia.org/show_bug.cgi?id=3311





--- Comment #48 from Tim Starling <[email protected]>  2009-05-19 
11:47:17 UTC ---
(In reply to comment #47)
> Why has this potentially helpful change been reverted? It seemed to be working
> well; the only problem was bug 17571, which surely can't be difficult to fix.
> We know that the tables don't get updated straight away when a category is
> changed to/from a redirect, and I presume we wouldn't want them to. Bots would
> handle emptying existing categories when they get redirected, exactly as they
> do now.

The tables indeed were not updated straight away, in fact they were not updated
at all, ever. You'd have to have a bot go through and edit every page in the
category, every time the redirect status or redirect target changed.

It's possible to do these updates immediately, with negligible performance
loss, and to retire the bots. But it would be much more difficult to implement
that feature if the categorylinks table was significantly polluted with
spurious links from r46706.


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