Doing similar-ish things with Claude, it's helpful to have something to ground it.

For instance, if you can say:

"Refer to the database schema in x.sql as your source of truth for the database structure we want to import into*. Do not invent data, tables or columns that do not exist. Carefully match all output against this database schema and do not create output that doesn't exist if it does not match the schema, simply skip it."

You will end up with a far better result in my experience.

Gotta treat it like a child.