Add dbt column descriptions

Previously, when you built out the staging models, one for each of the DuckDB tables, the focus was on setting up the SQL model file and making sure each data table was referenced correctly using dbt source.

Now, let's add by properly documenting each column with a description.

The column description format depends on the database (e.g., DuckDB) where the dbt models exist. A universal way to view columns is through dbt docs.

In this exercise, you will use the generated dbt documentation as a way to visualize what you will be building and documenting toward.