Import child notes of items (programmatically?)

I have a collection of items, for which I have notes in external files.

My understanding is that notes are stored in the sqlite database. Is there a way to import these external notes e.g. in a csv, into Zotero and associate them with their items (using the zotero item key is fine)?
I know I can run exports and then import, but the ways I've done that so far don't update the items they simply create new (duplicate) items. This 'round trip' model would be useful for a bunch of external analyses.

Any advice much appreciated
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