https://bugzilla.wikimedia.org/show_bug.cgi?id=49189

--- Comment #6 from Sean Pringle <[email protected]> ---
ar_id has been added to all wikis except enwiki where it's still in progress.
Another day or so required there as I have it well dialed back to avoid lagging
slaves.

el_id change will begin afterwards.

It's slow going because the online alteration method I'm using is two-stage to
compensate for the lack of primary and unique keys.

In hindsight altering these two tables online hasn't really saved much
wall-clock time compared to altering tables on slaves and rotating masters, but
it has nicely avoided any client disruption.

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