ProofreadPage uses images in some special ways that didn't generates a record on imagelinks table. This is a long known, already reported on some places as on Special:GlobalUsage @ Wikimedia Commons [1].
The absence of a record on imagelinks table not only brokens some statistics and monitoring tasks, but also creates challenges on those interested to fork, mirror or pre-parse XML dumps for offline usage relying on imagelinks.sql.gz Wikisource wikis.
Please add an automated way to create records on imagelinks table for images used by ProfreadPage extension.
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I've made two workarounds for pt.wikisource, but those workarounds are very hard to generate or maintain. For the record, [2] tracks individual files containing only one page digitized and [3] contains the multipage file formats.
pt.wikisource and the most majority of Wikisources already have a workaround for multipage files (rendering the cover or title page directly on Index: page) but this isn't also a guaranteed metod, since some Index pages don't renders it for some reason (new user that don't known how to do it or even absence of an scanned page to proper illustrate the digitization set)
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[1] - https://commons.wikimedia.org/wiki/MediaWiki:Globalusage-filterlocal
[2] - https://pt.wikisource.org/wiki/Utilizador:555/force_pagelinks_table_record/001
[3] - https://pt.wikisource.org/wiki/Utilizador:555/force_pagelinks_table_record/ext001