Add NOT NULL constraint to ci_runner_projects.project_id
What does this MR do and why?
This MR completes the implementation of #459996 (closed) in %17.2 by adding NOT NULL
constraint to ci_runner_projects.project_id
. The previous MRs in %17.1 already validated that no new records could be created with nil values, and deleted invalid records from the database.
This MR also adds the sharding key to the database documentation YAML.
Changelog: changed
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Edited by Pedro Pombeiro