@mkeftz I am researching the same topic you are mentioning.
Did you happen to find any guides in Firebase or Okta documentation that demonstrates how to use Okta as the provider of user’s / authorization / authentication along with the Firebase Realtime DB with rules that point to a copy of a user in the Firebase Auth DB?
I’m also considering not having the Firebase Auth DB populated with any user at all, and I’ll just build a Cloud Function to call into with the tokens from Okta to insert a record to use when permissioning the records in my firebase DB. So far just haven’t found much to help in terms of using Firebase in a production scenario.
The only examples I’ve seen so far are relevant to running Realtime DB with extremely relaxed rules.