Clarify no support for non PK id columns #34577
Merged
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Summary
Closes #34574.
Adds docs to clarify that we don't support non-primary key ID columns.
I had originally tried adding a warning upon setting
primary_key=
(similar to what we do for composite primary keys) but we have test coverage for not hitting the DB while setting the primary key, and I don't want to add a runtime check.