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Document plan to migrate CI tables to new database

Why is this change being made?

We are planning to move ci_* tables to a new database to reduce load on the main database gitlab-org&6168 (closed). This document will outline the plan (mainly from the infrastructure side) of how we'll actually perform the cutover with minimal user impact.

Review app https://document-ci-migration-to-new-database-plan.about.gitlab-review.app/handbook/engineering/development/enablement/sharding/migrate-ci-tables-to-new-database-plan.html

Author Checklist

  • Provided a concise title for the MR
  • Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
  • Assign this change to the correct DRI
    • If the DRI for the page/s being updated isn’t immediately clear, then assign it to one of the people listed in the "Maintained by" section in on the page being edited.
    • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies.
    • If the changes relate to any part of the project other than updates to content and/or data files please make sure to ping @gl-static-site-editor in a comment for a review and merge. For example changes to .gitlab-ci.yml, JavaScript/CSS/Ruby code or the layout files. (this requirement has been removed pending identification of a new DRI for the handbook)
Edited by Dylan Griffith

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