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Each Journal Entry Line has a `lineuniquekey` field (accessible via SuiteScript), with a value like "23412050".
It uniquely identifies the line within the scope of a given Journal Entry (i.e. no two lines within the same entry will have the same lineuniquekey).

Does this uniqueness guarantee extend beyond the scope of a single Journal Entry? I.e. is it safe to assume no two lines belonging to _different_ Journal Entries can have the same lineuniquekey either?

goes even further, lineuniquekey is unique across ALL transaction types

`lineid` is unique across a single transaction, and is what you'd actually use if you were updating the transaction (via suitescript, csv, etc).
there's also `Line Sequence Number`, which is just the row number of the line on the transaction.

This is great to know, thanks! Is the uniqueness scope of lineuniquekey documented anywhere?

notable that although `lineuniquekey` is unique across transaction types, it is not available on all transaction types. No explanation on why not.

I'm curious, how do we know it's unique across transaction types? I can't find that documented anywhere.

Behind the scenes transactions seem to all be in the same database table?