## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.
YES
## What kind of change does this PR introduce?
Troubleshooting guide
## What is the current behavior?
NA
## What is the new behavior?
Troubleshooting guide
## Additional context
Add any other context or screenshots.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Documentation**
* Added a new troubleshooting page: “Troubleshooting MIGRATIONS_FAILED:
missing tables or an incomplete schema on your branch” for Preview
Branch creation.
* Explained why replayed `main` migration history can fail when it no
longer matches the branch’s live schema.
* Included a step-by-step workflow to diagnose the failing migration via
logs, repair migration status, and then recreate or rebase the branch to
verify.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Claude <noreply@anthropic.com>
