# Compatibility Cleanup Register

Use this file to track temporary compatibility code introduced by architecture
migration PRs. Entries are required only for compatibility paths that are planned
for later deletion.

## Required Source Marker

```rust
// RUSTFS_COMPAT_TODO(<task-id>): <why this compatibility path exists>. Remove after <specific condition>.
```

## Open Items

- `#4648` walk-dir stream completion capability: old clients can append fallback output to an already-used metacache writer after a terminal body error, so servers emit terminal walk errors only to clients that sign the `walk_dir_stream_completion=error-v1` query capability and its request-body digest. Remove the legacy clean-EOF path after the minimum supported RustFS peer version always advertises this capability.

## Review Checklist

Before completing a PR that adds wrappers, re-exports, fallbacks, legacy action
mappings, or old endpoint compatibility layers:

- [ ] The source has a `RUSTFS_COMPAT_TODO(<task-id>)` marker.
- [ ] This register has a matching entry.
- [ ] The entry states why compatibility is needed.
- [ ] The entry states the exact removal condition.
- [ ] The cleanup is not bundled with new migration logic.