Please document description length constraints

[weaverba137]

While running a test, I created a column description like this:

          - name: ra
            datatype: double
            description: "RA"
            "@id": dlairflow_test_schema.dlairflow_test_table.ra

This produced an error:

  String should have at least 3 characters [type=string_too_short, input_value='RA', input_type=str]
    For further information visit https://errors.pydantic.dev/2.12/v/string_too_short

I think it's fine to have a minimum length on the description, but is that documented anywhere? For example, I recently looked through the Data Model, but did not see any mention of a minimum length.

It may well be that other fields have similar constraints, and those should be documented as well.

[weaverba137]

I do note that https://felis.lsst.io/user-guide/validation.html#validation-errors mentions this length constraint, but it is not an obvious place to look for all of the constraints on all of the fields.

[JeremyMcCormick]

I agree this information is not in a very obvious place in the docs.

Removing the constraint entirely and allowing any description length, including a blank string with "" is probably sensible. The model enforcing some arbitrary min length is not very intuitive.

[weaverba137]

Thank you.