We use PostgreSQL servers which are hosted on VMs as app databases. For HA, it's possible to get a database cluster with three hosts (one primary, two replicas). PostgreSQL supports multi-host jdbc connection strings as described on PostgreSQL: Documentation: 16: 34.1. Database Connection Control Functions . With this, a connection fail-over can be configured with something like
jdbc:postgresql://<host1>:<port1>,<host2>:<port2>,<host3>:<port3>/<database-name>?targetServerType=primary
(see Initializing the Driver | pgJDBC (postgresql.org))
In the mxpc-cli configuration tool I can create a dedicated JDBC database plan in which a JDBC connection string can be configured. However, according to the Expert Service, multiple hosts with connection-failover are not supported by Mx4PC. This means that we do not have the option of offering HA with the described DB setup.