Add foreign key constraints for all projectids #1655
Merged
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Our database schema is currently a mess. With no foreign keys defined, it is easy to accidentally forget to update a relationship field properly when an entity is created or deleted. Virtually all modern relational databases support foreign key constraints, and there is no reason for us to not add them.
In a first step towards #1442, this PR adds foreign key constraints to all of the table columns which reference a project's ID. This should be a relatively low risk operation for production systems, but it creates a bit of a headache when writing tests, because creating any model which references a project necessarily requires a project model to be created as well.