Updating Production Database Schema


The production database cluster is serious business 😱. Think twice whenever interacting with it and check with others in face of the slightest doubt.

The listenbrainz image on which most of ListenBrainz containers run has the psql command installed. You can exec into a container and use the psql to connect to the relevant database and execute scripts. The connection parameters to connect to the databases are in /code/listenbrainz/listenbrainz/config.py.

Whenever modifying the database, run the sql commands inside a transaction if possible. Once you have started the transaction, execute the commands you want to. Do not commit the transaction yet. Double check the state of the database to ensure the changes are in line with what you expect. If so commit the transaction otherwise rollback and contact other maintainers.