We currently require Redis in order to use musicbrainz-server. We've decided to switch to Valkey in production, as it will remain fully open source and is also actively developed.

According to their migration guide, "Valkey is compatible with Redis OSS 7.2 and all earlier open source Redis versions, as Valkey 7.2.4 is a fork of Redis 7.2.4. Migrating from any open source Redis version to Valkey is effectively an upgrade."

This ticket is divided into several tasks:

• Test running musicbrainz-server with Valkey 9.x
• Update any references to Redis / redis-cli in our documentation and internal scripts to Valkey / valkey-cli
• Upgrade to Valkey 9.x in production
• Document a migration path for existing musicbrainz-server / musicbrainz-docker instances using Redis