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3a18dbcc53
Incorporates changes from XRPLF/rippled PR #5468: - Add getBlockSize() method to Backend interface Returns std::optional<std::size_t> for backends that support configurable block sizes (currently only NuDB) - Update parseBlockSize() to throw exceptions instead of warnings Invalid block size configurations now throw std::runtime_error with descriptive error messages instead of silently using defaults - Read existing database block size as default parseBlockSize() now checks existing nudb.key file for block size using nudb::block_size() before applying configuration - Add comprehensive unit tests (NuDBFactory_test.cpp) Tests cover default sizes, valid sizes (4K-32K power-of-2), invalid sizes, error messages, power-of-2 validation, and data persistence across different block sizes These changes improve configurability and error reporting while maintaining backward compatibility.