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Perf shows a significant amount of time is spent on `Keyspace::merge`. This pull request postpones merging keyspace until retrieving the layer, which contributes to a 30x improvement in aux keyspace basebackup time. ``` --- old 10000 files found in 0.580569459s --- new 10000 files found in 0.02995075s ``` Signed-off-by: Alex Chi Z <chi@neon.tech>