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d92cd42fe6
Add a new scylla metadata component LargeDataRecords (tag 13) that stores per-SSTable top-N large data records. Each record carries: - large_data_type (partition_size, row_size, cell_size, etc.) - binary serialized partition key and clustering key - column name (for cell records) - value (size in bytes) - element count (rows or collection elements, type-dependent) - range tombstones and dead rows (partition records only) The struct uses disk_string<uint32_t> for key/name fields and is serialized via the existing describe_type framework into the SSTable Scylla metadata component. Add JSON support in scylla-sstable and format documentation.