When an application is already deployed and changes to the database are necessary, a migration needs to be written. This can be done as follows. If you have never written a migration before, obtain `h2-1.3.176.jar` and `liquibase.zip` from another developer. Then add liquibase to your path. When this is done, run the development branch with the following settings:
Then run your branch, but change `testdb-old` to `testdb-new`. Afterwards, you can generate a changelog with the following script:
Finally, copy your changes from `changes.yaml` to the bottom of `migrations.yaml`. Double check whether the generated changelog makes sense. Sometimes, you might need to add default values or change column types.