At my company, every single PR is linked to a ticket. These tickets can be linked to each other as causes, related issues, etc. Having them around and reasonabl

At my company, every single PR is linked to a ticket. These tickets can be linked to each other as causes, related issues, etc. Having them around and reasonably organized has been invaluable for us since we can simply blame a change, trace it all the way back to when it wad introduced, and see why it was put there to begin with. Jira and our wiki system (Confluence) cross-reference each other where appropriate as well. Altogether, it makes the investigation part our jobs way simpler. I would not think to purge entries simply because they're older than an arbitrary date.