The vSphere Replication virtual appliance includes the VMware standard embedded vPostgreSQL database.

vSphere Replication does not support an external vPostgreSQL database or any other external databases.

You can reset the vPostgreSQL embedded database, by using the Virtual Appliance Management Interface (VAMI). For more information about the commands that you can use, see the PostgreSQL documentation at https://www.postgresql.org/docs/11.