What is the vpxuser account and how is its password stored in vCenter's PostgreSQL database?

When an ESXi host connects to vCenter, it creates a root-privileged user named `vpxuser`. Its password is encrypted and stored in the `vc.vpxv_hosts` table, with a default 32-character length regenerated every 30 days. You can extract this encrypted password using the SQL query `SELECT name,username,password FROM vc.vpxv_hosts;`. This information is critical for lateral movement, as discussed in vSphere Development Guide 4 - PostgreSQL.