[FluidFS 3.0] How to clear event db in (/var/lib/pgsql) at PowerVault NX3610 unit?

Hello, everybody!

We're using PowerVault MD3600i and PowerVault NX3610 as NFS storage.

Last time, it was warned that an event DB volume (/var/lib/pgsql) is out of space with showing 97% usage.

Currently, it shows an error as follows:

Internal hard error occurred (mng/ngm/custom/modules/src/EventsList.cpp:730 - Failed to populate the Events data structure (Events DB might be down)).

It seems like that event DB is full and no more accessing PostgreSQL after 6 years operation.

How can I clear or reset this event DB?

Do we need to enter the system with escalation access to clear DB?