T174045: DB schema migration for MCR

Phabricator Link	T174045
Status	open
Priority	normal (orange)
Author	[1]
Owner
Projects	Epic Wikidata (monitoring) Multi-Content-Revisions (Deployment) (Epic) CPT Initiatives (MCR) Structured Data Engineering (Monitoring) Structured-Data-Backlog (Tracking) Schema-change (Change)
Subtasks	T174030: Implement DB schema migration tools for MCR, T174028: Finalize database schema for MCR content meta-data, T183490: MCR schema migration stage 4: Migrate External Store URLs (wmf production)
Parent Tasks	T174043: Deploy Multi-Content Revisions
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