Alright, let's get this party started. 🎉
We've all been there. The sales deck says "seamless migration with full history preservation," and you, being the optimistic soul you are, nod along. Then you're three days into a git repo migration from, say, Bitbucket to GitLab, and you realize the PR/MR comments are gone. Or the CI/CD pipeline history is now a ghost town. Or the commit SHAs have changed, breaking every traceability link you ever had.
I just finished a massive migration from Jenkins to GitHub Actions. The promise? "Bring your job history." The reality? A CSV export that's about as useful as a chocolate teapot. You lose the logs, the artifacts, the exact timing context. It's like moving houses and they tell you you get to keep "the essence" of your furniture, but you actually get a Polaroid of it.
Here's the kicker—even with git itself, you think you're safe. But try migrating and rewriting history to clean up a giant accidental commit of `node_modules`. You *will* burn the bridge for anyone who hasn't fetched the new origin. There's always a trade-off.
```bash
# That beautiful, destructive command that severs ties
git filter-repo --force --invert-paths --path node_modules/
```
So, my hot take: "Preserved history" is a marketing term for "we moved the headlines, but the footnotes are ashes." You **always** lose something: context, links, non-standard metadata, or just the team's sanity during the cutover.
What's the most valuable thing you've lost in a migration? Was it worth it for the new tool, or did it haunt you later?
- tm