In support of the migration away from Blazegraph, work is required to update the queries in WikibaseQualityConstraint (WBQC) to query the new backend.
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Some things that will need updating in SparqlHelper, off the top of my head:
- remove a hint:Prior hint:gearing "forward" that’s working around T168973 which will hopefully not be an issue on the new backend
- adjust isTimeout() detection
Both of these have associated config variables (look for $wgWBQualityConstraintsSparqlTimeoutExceptionClasses and $wgWBQualityConstraintsSparqlHasWikibaseSupport, among others), but we might still want to update the code and not just the config.