[rad_gruchalski]

I found this: https://www.janua.fr/offline-sessions-and-offline-tokens-wit.... janua.fr is a very solid Keycloak resource. The write up is for a pretty aged Keycloak version but there are probably some decent pointers in there.

[photonios]

This article gets pretty close, but it misses a very critical piece. If you're running Keycloak 16 or older, you'll explicitly want to enable lazy offline session loading [0]. Otherwise, Keycloak will attempt to load ALL offline sessions in memory during startup.

Keycloak 17 made offline sessions lazily loaded by default.

[0] https://www.keycloak.org/docs/16.1/server_admin/#offline-ses...