Get ready for Wikidata Query Service graph split before March 2025

[diegodlh]

Because scholarly articles in Wikidata were slowing down SPARQL queries, it has been decided to split the Wikidata Query Service graph into two subgraphs: one for scholarly articles and another for everything else. This translates into there being two SPARQL endpoints now, each serving a different subgraph. See https://lists.wikimedia.org/hyperkitty/list/[email protected]/thread/HWKBCPKPL5D4HN6TPJQ6PRCGAFHY7WFE/

For the moment, the SPARQL endpoint we are using now seems to continue serving both subgraphs. However, this would no longer be the case starting on March 2025.

We have to make sure our SPARQL queries are ready for this change. We may also use this opportunity to see if any of our SPARQL queries can be replaced by other methods, such as Wikibase REST API (not to be confused with MediaWiki Action API). See here: https://www.wikidata.org/wiki/Wikidata:Data_access