You don't always need the hash id. @ is equivalent to HEAD, there's also @- for HEAD~, @-- for HEAD~2, etc. with jj log the revset can also be a complex expression https://jj-vcs.github.io/jj/latest/revsets/. You can also create a bookmark to track a remote git branch that's also updated when you fetch. But you have to move the bookmark when you make changes locally.
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