High Availability (with PostgreSQL database)

High Availability (with PostgreSQL database)

The documentation is not really clear to me, how does the HA actually work? Primary is read and write but is the HA server also supposed to be able to read and write? I thought the HA server was read only? So I was able to enter a resource into the HA server so obviously its not read only. Is the HA server supposed to sync back to the Primary? If so, when? Because I haven't seen the resource sync back to the primary. Anyone know?
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