How To Update Data Without Disturbing UniqueID's

I have a database of airports that must be updated routinely.

How do i update the database of airports without deleting everyting and re-importing? I’ve noticed it breaks all of the old entries in the DB when i do this as they’re no longer connected to the same unique ID.

I need a way to assign airport codes to specific unique id’s i guess and update its data on import.

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