Make more obvious how to define "relationships"
I see this in the docs but I can't find a way to make an ID column refer to another table. I was expecting to find it in the schema page of the table.
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Relationship Display
By default relationships are displayed using the humanized table name and the primary key (for instance User #37). However you can configure a specific column to be used for labeling these links. You might have for instance a pseudo column on a users table.
To choose the Label column for a table, go to the listing view of the table and click on the cog button. In the modal, you will find a pane titled Miscellaneous, which contains the Label column option."