Update credential rotation process for Clickhouse migrations

GitLab Infrastructure Service - incident.io
2026-04-02T15:03:16Z

The Clickhouse migration failed due to outdated authentication credentials that were not updated after a recent password rotation. Update operational documentation and rotation processes to ensure Clickhouse credentials are promptly updated in all systems after future password rotations, to prevent future migration failures.

_This ticket was created from_ [_INC-8963_](https://app.incident.io/gitlab/incidents/8963) _using_ [_incident.io_](https://app.incident.io) 🔥