/etc/init.d/postgresql92 rebuild - builds new fresh database, but how to delete entries from PostgreSQL where user authentication entries are stored, which are related to last 20 sessions displayed when you click on 'Management'?
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Yes, that command would rebuild the database but that won't delete entries from Postgres.
As Michael mentioned What are you trying to achieve?
I'm trying to delete 10 last logins from 20 list.
Thank you for the follow-up!
As far as I know, this is not possible or supported via postgres command.