T174022: Implement multi-content revisions

Phabricator Link	T174022
Status	open
Priority	normal (orange)
Author	[1]
Owner
Projects	Epic Multi-Content-Revisions (New Features) StructuredDataOnCommons (SDC General) (Continuous tasks / Epics) Wikidata (monitoring) CPT Initiatives (MCR) Structured Data Engineering (Monitoring) Structured-Data-Backlog (Tracking)
Subtasks	T185793: Revision hash needs to consider content model and slot role, T189808: Make undo work with multiple slots., T196087: Refactored implementation of MCR page update interface, T198297: Use PageUpdater to create dummy revisions, T189220: Ensure that relevant extensions are MCR-aware, T190066: Expose all slots to the search interface, T198492: Create a maintenance script to drop rev_text_id and ar_text_id from the database., T187935: Allow cross-slot access during HTML rendering., T209044: Introduce a ContentStore service to allow certain types of content to not be stored as serialized blobs., T209878: Allow control of page layout of multiple slots during rendering, T107595: &#91 RFC&#93 Multi-Content Revisions, T174033: Refactor EditPage to allow multiple slots to be edited atomically &#91 MCR&#93 , T174037: Implement single-slot UI &#91 MCR&#93 , T174032: Make relevant API modules aware of MCR, T174023: Implement MCR storage layer
Parent Tasks	T174043: Deploy Multi-Content Revisions
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