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Created by: teddywing

All our primary keys are supposed to be bigints, and our foreign keys should likewise be bigints. But it's easy to forget this when creating migrations, or some committers might not have been up to speed on the convention. In any case, this changes all existing foreign keys to be bigints.

Need to get this out now so that Michel Etienne can use it to correctly test the Java application for compliance check validations. That's why I'm not including any future-looking checks or enforcements here. That will be coming next.

Refs #4947