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## Problem `test_historic_storage_formats` uses `/tenant_import` to import historic data. Tenant import does not create timelines onto safekeepers, because they might already exist on some safekeeper set. If it does, then we may end up with two different quorums accepting WAL for the same timeline. If the tenant import is used in a real deployment, the administrator is responsible for looking for the proper safekeeper set and migrate timelines into storcon-managed timelines. - Relates to https://github.com/neondatabase/neon/pull/11712 ## Summary of changes - Create timelines onto safekeepers manually after tenant import in `test_historic_storage_formats` - Add a note to tenant import that timelines will be not storcon-managed after the import.