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[email protected] Thanks for the reply, I'm glad these discussions are taking place.
I independently settled on the approach advocated in that link you shared — given any Note ID, I traverse up the chain until I find the root, and that becomes the original topic post.
If there were some sort of standard for defining a topic ID, I would use that, although I think at present there are no consistent applications.
FEP-400e explicitly mentions forum topics, but I am not entirely certain whether this is something I'd want to follow as topic themselves don't have an "owner".