Readonlyaccessedwhether this session has opened (mounted) the shard
Readonlycompressedwhether the shard ships only as a compressed .br/.zst bundle (so it must be unpacked to be read)
Readonlyidthe shard id, e.g. current-top (its base/current/history prefix is the scope it belongs to)
Readonlyunpackedwhether the shard's decompressed cache exists on disk (unpacked, this session or an earlier one)
the on-demand load state of one shard of a SigDatabaseSet