CSG: Changing user password incredibly slow

I’m running CSG 3.0.9 and Couchbase Server 7.1.1. Lately, a strange problem started to appear: changing CSG user passwords for existing users via POST to the _user REST api is incredibly slow (sometimes > 1 minute). However, setting a password for new users is fast (< 1s).

I tried to debug the problem:

• When changing password of an existing users, sg_info.log contains entries like 2025-07-01T17:42:16.792+02:00 [INF] Query: N1QL Query("sessions") took 1m1.327559001s
• in the “slowest completed queries” section of couchbase server interface I see plans like these:
  

→ if I interpret it correctly, this means that:

• the syncDocs index emits nearly 100k keys (I just checked: 100k is also the total number of _sync:session:% docs in my DB)
• these 100k keys are fetched ← this seems to be the slow step
• after they were fetched, only a single document is emitted

Strangely, my cluster has been working flawlessly for ages. This slowness only appeared after I upgraded my servers recently and increased indexer RAM – but I don’t see how this could be connected.

Do you have any idea what’s going on / how to fix the problem? Thanks a lot!

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