Are Epic -> Task / Story -> Sub-task relationship stored in Jira DB and how?
It couldn't *not* be stored in the database really...
Subtasks are implemented as issue links, so everything is in the issuelink table. Join on issuelinktype to filter on particular linking relationships, such as "sub-task of".
Thank you, I don't know how I have missed that. The same is valid for Epic -> Task relationship.
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