Unlike most APIs with NoSQL databases, Reference API has a SQL database for storage. In the light-reference repository, there is ref.sql, which is the source for the production reference. To execute the ref.sql on test4 or prod4, follow the steps below.
Copy the ref.sql to the remote server
scp ref.sql prod4:/home/[userid]/ref.sql
ssh to the test4 or prod4 and copy the file into the MySQL docker container