(If you don't work with the imagelinks or categorylinks tables, you can ignore 
this message)

Hello,

Here is an update on the ongoing normalization of the MediaWiki link tables.

Starting 1 March, the cl_to and il_to columns in the categorylinks and 
imagelinks tables will be removed. You will need to use cl_target_id and 
il_target_id, respectively, and join against the linktarget table instead. This 
is analogous to the templatelinks normalization done a few years ago.

Additionally, the cl_collation column in the categorylinks table will be 
removed. Please use cl_collation_id joined with the collation table instead.

If your tools or queries access these tables directly, please update them to 
use the new schema before 1 March.

Progress is tracked at: https://phabricator.wikimedia.org/T300222
Background/rationale: https://phabricator.wikimedia.org/T222224

Thank you,
Alexander Vorwerk — IRC: Zabe
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