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We need to keep sharding metadata consistent with tablet mapping to shards in order for node restart to detect that those sstables belong to a single shard and that resharding is not necessary. Resharding of sstables based on tablet metadata is not implemented yet and will abort after this series. Keeping sharding metadata accurate for tablets is only necessary until compaction group integration is finished. After that, we can use the sstable token range to determine the owning tablet and thus the owning shard. Before that, we can't, because a single sstable may contain keys from different tablets, and the whole key range may overlap with keys which belong to other shards.