WordPress relational data portability audit

Review whether a plugin can export, restore, merge, and delete related custom- table data without silently changing relationships. This skill is about the data graph and recovery contract, not merely generating syntactically valid SQL.

Core invariant

Define the invariant before reviewing code:

Every exported/imported/retained child and shared dimension refers to the same logical object as before, or the operation fails visibly before commit.

A file that imports without a SQL error is not proof of a correct restore.

Audit workflow