The proposal to merge lp:~cjwatson/launchpad/package-cache-drop-changelog into 
lp:launchpad has been updated.

Description changed to:

Stop populating DistributionSourcePackageCache.changelog, and make 
update-pkgcache depopulate it.

The changelog was first added here in 
https://bugs.launchpad.net/launchpad/+bug/48735, and it is at least considered 
only as a bottom-priority item.  But it doesn't make all that much sense, at 
least nowadays: we now have a pretty decent batched +changelog view, matching 
on changelog terms will often not be what you expected except in 
special-purpose circumstances, and general fishing expeditions are probably 
better handled by a general-purpose search engine.  The changelog makes up 
about half of the table size (166 of 341 MB on dogfood), so I'd like to trim it 
down so that we can make the package cache quicker to update and easier to use 
for source package vocabulary pickers.

The next step will be to drop the column from the database, but we need this on 
production first to rebuild the fti column.

For more details, see:
https://code.launchpad.net/~cjwatson/launchpad/package-cache-drop-changelog/+merge/294894
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