Azure Storage Migrations

[sdiachen]

Design migration framework to migrate Azure Storage data

• the system should keep operational when:
• Partition and Row key changed
• new attribute added
• attribute removed (probably through several migrations)
• system should work with previous and current data simultaneously

Implementation thoughts:

• Use some kind of semver to version schema (e.g. index change major version, attribute change minor version)
• Use some kind of transformer in access logic to handle old versions still present in data