https://bugzilla.wikimedia.org/show_bug.cgi?id=28824

--- Comment #2 from Aryeh Gregor <simetrical+wikib...@gmail.com> 2011-05-05 
22:44:46 UTC ---
Specifically, for most updates we don't need to log anything in updatelog -- we
can directly check whether the update is present.  This is simpler and more
failsafe, so I don't like the idea of using updatelog for those updates unless
there's some good specific reason (speed?).

However, for updates where we can't tell whether it's been run without an
updatelog row, obviously we've got to add that on fresh installs, yeah.  At
best it would be a waste of time to run those updates unnecessarily, and at
worst perhaps dangerous.  (Although I'm not sure what kind of updates would be
harmful to run twice, that wouldn't also cause problems if they were aborted
midway through and had to be resumed.)

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