# Live File Migration Pattern

When reorganizing, migrating, or archiving active infrastructure files (like scripts, documents, markdown notes, or configurations) on a live server, moving the file abruptly can break cron jobs, hardcoded paths in scripts, references in other notes, or user habits.

Instead of a simple `mv`, use the **Copy-Remove-Symlink** pattern to safely migrate files while keeping the old path functional.

## The Pattern

```bash
migrate_file() {
    src="$1"
    dest_dir="$2"
    
    # 1. Ensure source exists
    if [ -f "$src" ]; then
        filename=$(basename "$src")
        dest_path="${dest_dir}/${filename}"
        
        # 2. Copy to new destination
        cp "$src" "$dest_path"
        
        # 3. Remove original
        rm "$src"
        
        # 4. Create a symlink at the original location pointing to the new destination
        ln -s "$dest_path" "$src"
        
        echo "Migrated $src -> $dest_path"
    else
        echo "File not found: $src"
    fi
}

# Example usage:
mkdir -p /root/projects/itpp-infra/backups
migrate_file "/root/.hermes/references/backup-policy.md" "/root/projects/itpp-infra/backups"
```

### Why this works
1. Existing scripts/references pointing to the old path follow the symlink transparently.
2. The file is physically relocated to the new taxonomic structure.
3. Over time, references can be updated to the new path, and the symlinks eventually cleaned up when safe.

Use this whenever the user asks to "move existing docs", "reorganize folder X", or "migrate configurations" to prevent silent breakages in the background infrastructure.