to the ar_text and ar_flags columns of the archive table or make those
columns nullable before upgrading to MediaWiki 1.31.
maintenance/archives/patch-nullable-ar_text.sql shows how to do this for MySQL.
+* The CologneBlue and Modern skins are no longer bundled with the tarball. You
+ will need to remove the wfLoadSkin() calls from your LocalSettings.php or
+ download them separately
+ (<https://www.mediawiki.org/wiki/Special:SkinDistributor>).
=== Configuration changes in 1.31 ===
* $wgEnableAPI and $wgEnableWriteAPI are now deprecated and will be removed in