In #72085, we added storage.UpdateSSTTimestamps() which is used to rewrite ingested SST MVCC timestamps to the request timestamp in order to comply with the timestamp cache and closed timestamp. However, this is a very slow implementation, which needs optimization.

This optimization should probably be done in Pebble, to take advantage of its internal data structures. For example, the rewrite could process blocks in parallel, and simply copy the Bloom filters and value checksums without recomputation as these do not depend on the MVCC timestamp.

Epic CRDB-2624