So I made a PR... I just wanted to see if this is something we can put into the core / concerns of doing so. Please give it a quick look to see if this is something that would be feasible:
Saving user bookmarks in db by bdharrington7 · Pull Request #3234 · NodeBB/NodeBB
Hey NodeBB team,
I've started figuring ways to save a users bookmark in a thread to
Save the user's place across devices
Save the user's place in case of a browser clear
This is most of the functionality, the only part I'm having trouble with is when a user has a bookmark we know about, then we redirect to it, but it basically causes another entry into the browser history, so when you click 'back', you're on the same thread again (another click back will actually exit the thread)
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GitHub (github.com)