Why Redis & PostgreSQL databases?

Could you tell me what data are stored in each database?

Why we don’t use one database for both persistent and non persistent data?

What are the persistent and what the non persistent data?

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Please see also https://www.loraserver.io/install/requirements/. Both databases are used for performance reasons as they are different in concept and provided features:

Hi ktsakos,
Has your problem been solved?
Did you figure out what are the persistent and what the non persistent data in LoRa server ?
I am confused with it too.
Thanks !

What are the persistent and what the non persistent data?