ChirpStack OS Postgres access

I just installed ChirpStack OS on a Raspberry 3B+ and am waiting on a RAK2245 to arrive, while waiting I was looking into the database but found I lack a password. Reading the online documents I haven’t found any mention of a password. I did find:
ChirpStack Application Server persists the gateway data into a PostgreSQL database.
But I don’t understand what that sentence is trying to convey, ‘persists’ ?
Where do I locate the password for Postgres?

Hello!

chirpstack-application-server

Where do I locate the password for Postgres?

You can find the PostgreSQL database account in chirpstack-application-server.toml.
Example:
postgres://user:password@hostname/database?sslmode=disable

But I don’t understand what that sentence is trying to convey, ‘persists’ ?

You can loking for old mesaured and conection data.

Found the postgres login, discovered the database has nothing to do with device data, that is what redis is for I guess.