Use `ons_code` for ID of rows in `public.stp` table
Use `ons_code` for ID of rows in `public.stp` table

* `hscic.stps` doesn't have a `code` column yet.
* The `public.ccg` table has a foreign key called `stp_id` which
  contains an ONS code.
* Once we have ODS codes for STPs, we can update both `public.stp` and
  `public.ccg`.
* That this will change is already reflected in the draft documentation.

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