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## Problem part of https://github.com/neondatabase/neon/issues/7546 Add Azure time travel recovery support. The tricky thing is how Azure handles deletes in its blob version API. For the following sequence: ``` upload file_1 = a upload file_1 = b delete file_1 upload file_1 = c ``` The "delete file_1" won't be stored as a version (as AWS did). Therefore, we can never rollback to a state where file_1 is temporarily invisible. If we roll back to the time before file_1 gets created for the first time, it will be removed correctly. However, this is fine for pageservers, because (1) having extra files in the tenant storage is usually fine (2) for things like timelines/X/index_part-Y.json, it will only be deleted once, so it can always be recovered to a correct state. Therefore, I don't expect any issues when this functionality is used on pageserver recovery. TODO: unit tests for time-travel recovery. ## Summary of changes Add Azure blob storage time-travel recovery support. Signed-off-by: Alex Chi Z <chi@neon.tech>