MigrationTransfer
Moving data or systems safely — see SYSTEM_DESIGN_ALIGNMENT.md sections 9.1, 9.6.
Why we need this / what value this brings
Migrations done carelessly are one of the most common sources of production incidents and data loss.
When to use this
Whenever schema or infrastructure needs to change under an already-running, populated system.
How to use or implement this
Make every migration reversible or at least tested against a copy of real (or realistic) data before running it in production.
Subtopics
Empty folder — drop notes, links, and findings here as you research.