CRITICAL: BTree key truncation to 7 bytes corrupts index #148

Why is this an issue?

In src/storage/btree_index.cpp:71:

size_t len = std::min(s.size(), static_cast<size_t>(7));
std::memcpy(data, s.data(), len);

Text keys truncated to 7 bytes. Different strings compare as equal, causing wrong data returned.

What is causing it?

Fixed 8-byte key storage with silent truncation.

How can it be solved?

Implement variable-length keys.

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• Critical