hot_standby = on is required only on the replica. Primary-only settings (max_wal_senders, wal_keep_size) can safely be copied to the replica; Postgres ignores them there. Ensure replication user ...

When connecting to a PostgreSQL database, Keycloak 26.4.0 requires at least PostgreSQL server version 13.0.0. This wasn't yet the case with Keycloak 26.3. I suggest ...