Hi everyone,

This is an important message to all the people running external tools.

About 2 years ago we said we want to get rid of the
"wb_entity_per_page" table. This is still the case and is becoming
more pressing now with the introduction of support for lexicographical
data.

On July 12th, we are going to stop updating the "wb_entity_per_page"
table from the Wikibase database and stop its replication on ToolLabs.
At a later point we will remove it completely.

"wb_entity_per_page" was a secondary database table, mapping Wikibase
entity IDs (e.g. "Q42") to MediaWiki page IDs (e.g. 138, which can be
seen at https://www.wikidata.org/wiki/Q42?action=info).
"wb_entity_per_page" stored entity IDs as numbers, while page titles
are always full entity IDs.

This mapping existed because Wikibase was designed with the
possibility to have entity pages where the ID does not match the
title. This idea was never used, and finally removed in 2015
(documented in https://phabricator.wikimedia.org/T95685). We decided
to get rid of the table because it contains outdated information that
could mislead users, it costs resources and could conflict in the
future with our new entity types for lexicographical data.

Please check if you are maintaining any code that accesses the
"wb_entity_per_page" table, and replace it with lookups to MediaWiki's
"page" and "redirect" tables.

We will drop the replica of the table on ToolLabs for
test.wikidata.org on June 28th. We will do the same for wikidata.org
on July 12th.

If you have any question or issue, feel free to add a comment on the
ticket (http://phabricator.wikimedia.org/T95685) or to ping me. Thanks
for your understanding


Cheers
Lydia

--
Lydia Pintscher - http://about.me/lydia.pintscher
Product Manager for Wikidata

Wikimedia Deutschland e.V.
Tempelhofer Ufer 23-24
10963 Berlin
www.wikimedia.de

Wikimedia Deutschland - Gesellschaft zur Förderung Freien Wissens e. V.

Eingetragen im Vereinsregister des Amtsgerichts Berlin-Charlottenburg
unter der Nummer 23855 Nz. Als gemeinnützig anerkannt durch das
Finanzamt für Körperschaften I Berlin, Steuernummer 27/029/42207.

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