Re-running Imports & Overwrite

First migration: leave overwrite off

On a first import, duplicates are skipped safely. Turn overwrite on only to re-run an import and update items that already came over.

How matching works

• Modules: ID or title+type. Menu items: ID or alias+menutype.
• Articles: ID or alias. Categories: alias+extension.
• Users: ID, username, or email.

Fixing a wrong-order import

If the importer warns about order (e.g. modules before menus), import the missing earlier step, then re-import the later file -- references resolve on the second pass through the recorded ID maps.