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547914fe19
## Problem Spun off from https://github.com/neondatabase/neon/pull/5449 Timeline deletion does the following: 1. Delete layers referenced in the index 2. Delete everything else in the timeline prefix, except the index 3. Delete the index. When generations were added, the filter in step 2 got outdated, such that the index objects were deleted along with everything else at step 2. That didn't really break anything, but it makes an automated test unhappy and is a violation of the original intent of the code, which presumably intends to upload an invariant that as long as any objects for a timeline exist, the index exists. (Eventually, this index-object-last complexity can go away: when we do https://github.com/neondatabase/neon/issues/5080, there is no need to keep the index_part around, as deletions can always be retried any time any where.) ## Summary of changes After object listing, split the listed objects into layers and index objects. Delete the layers first, then the index objects.