Constant DEFAULT_DATABASE_MAX_BYTES 

pub const DEFAULT_DATABASE_MAX_BYTES: u64 = _; // 4_294_967_296u64

Hard ceiling for one portable database archive/root.

The current WAL backend still stores segment files under this root, but callers should treat the resolved .loradb path as the database artifact. The archive backend will use the same limit when it starts writing framed compressed chunks directly into portable files.