I want to be able to see only "fresh" user stories - these would be User Stories for which all Sub-Tasks are with status = Open. Is it possible with JQL or with the help of some plugins?
By Story, I'll assume you mean one JIRA issue.
So you're looking for JQL for something like find issues which "has subtasks that are open AND does not have subtasks in any other status" ...
... as far as I can tell, this is impossible in JIRA without plugins. You can search for subtasks of one issue in vanilla JIRA, using something like parent = TEST-56, but that's about it.
Here someone suggested a free addon "AM Utils" which claims to offer parent and subtask search:
There are also expensive commercial plugins such that can do this, such as as J-trickshas subtask JQL query) or Craftware Search Linked Issues (has subtask search) or ScriptRunner (which can do almost anything you can imagine. It was great until they added a price tag to the formerly free plugin).
Atlassian are unlikely to include better subtask handling in their JQL anytime soon IMO, since there's several plugins that can do it, so no one will vote for feature requests.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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