Core Platform Team/Initiative/MCR schema migration/Initiative Description
Complete the schema migration tasks associated with the Multi-Content Revisions (MCR) project.
- Significance and Motivation
This initiative is necessary to remove the tech debt remaining from the pre-MCR schema.
Writing to pre-MCR fields is disabled in WMF production. Pre-MCR fields can be dropped from the database at the discretion of DBAs. All code that writes pre-MCR fields has been removed from core.
- Baseline Metrics
Some core in core and extensions still relies on information in pre-MCR fields in the database. This makes it impossible to stop writing to these fields.
- Target Metrics
All code that accesses pre-MCR fields in the database is removed or gated with the MCR migration stage. This applies to core as well as deployed extensions and bundled extensions.
core developers, database admins
- Known Dependencies/Blockers