Value attribution codes were converted into UUIDs and stored in the users, projects, api_keys, bucket_metainfos, and value_attributions tables in the partner_id column. This migration will lookup the appropriate partner name associated with each of these UUIDs, and store the partner name directly in the user_agent column within each table. If an error occurs during the partner ID to partner name conversion, the partner ID value will be migrated to user_agent.
A note on the migration test data, postgres.v182.sql:
With one exception, all preexisting rows in the relevant tables had a NULL partner_ID. Therefore, we needed to insert new rows with partner_ID set under the OLD DATA section in order to test that the migration works. For each affected table, we insert one row with a valid partner ID which has a corresponding partner name, and one row with a partner ID which would return an error during the conversion to the partner name.
Change-Id: Iad977d72df0ce95a0c5ca80a065c4276ec1f2354