The ups and downs of September and October, plus extension code review analysis: The Wikimedia Foundation's engineering report for September 2012 was published this week on the Wikimedia Techblog and on the MediaWiki wiki, giving an overview of all Foundation-sponsored technical operations in that month (as well as brief coverage of progress on Wikimedia Deutschland's Wikidata project, phase 1 of which is edging its way towards its first deployment). Three of the seven headline items in the report have already been covered in the Signpost: problems with the corruption of several Gerrit (code) repositories, the introduction of widespread translation memory across Wikimedia wikis, and the launch of the "Page Curation" tool on the English Wikipedia, with development work on that project now winding down. The report also drew attention to the end of Google Summer of Code 2012, the deployment to the English Wikipedia of a new ePUB (electronic book) export feature, and improvements to the WLM app aimed at more serious photographers.