- Put Phabricator into cluster database mode (`cluster.databases = ...`).
- Swapped `storage.default-namespace` to force initialization of a new install.
- Ran `bin/config upgrade`.
- Before patch: Immediate fatal about unreachablility.
- After patch: Database initialized.
- Also ran initialization steps in tranditional single-host mode (`cluster.databases` empty, `mysql.host` configured).