These fields are being refactored so they conform with the new
wh_credential_dimension. This will inform Business Intelligence tools
that these attributes conform across dimensions.
The tables in the operational part of the Boundary database (meaning
non-warehouse tables) suffix primary key columns and foreign key columns
with `_id`. Many of these columns appear in the warehouse dimension and
fact tables as normal attributes, not primary keys or foreign keys. To
disambiguate ID columns from operational tables, the primary key column
for dimension tables will be renamed from `id` to `key` and the foreign
key columns in the fact tables will be renamed to change the suffix from
`_id` to `_key`.
Timothy Messier