Question: App changes that involve changes to the database should be rolled back when there are problems with the release use feature flags to modify database

App changes that involve changes to the database

should be rolled back when there are problems with the release

use feature flags to modify database fields

can be done while the app is running by having a code path work with the old schema and a separate code path that runs with the new schema

require the service to be take offline, so that the migration can be performed

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