<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Collaborate/take over this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=432504) </details> <!--IssueSummary end--> The Kotlin color has been updated in https://gitlab.com/gitlab-org/gitlab/-/merge_requests/135991+, however, it was discovered that this change was not showing the new color on gitlab.com. From some investigation it looks like we only fetch the color values from the YAML file if we do not have a record in the database already. To fix the issue we need to create a migration to update the color values for Kotlin to `#7F52FF` https://docs.gitlab.com/ee/development/database/batched_background_migrations.html [Follow-up from discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/135991#note_1652347350) > @jwoodwardgl > > I'm looking through the code to figure out how this logic works. So far I have found > > We render the language bar here: https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/views/projects/show.html.haml#L20 > > Which calls our helper from here: https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/helpers/repository_languages_helper.rb > > The helper calls `language.color`: https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/helpers/repository_languages_helper.rb#L15 > > Which has been passed in during rendering so now looking for `project.repository_languages` > > Interestingly that's a relation: https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/models/project.rb#L331 > > The RepositoryLanguage model: https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/models/repository_language.rb > > Delegates color to ProgrammingLanguage model: https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/models/programming_language.rb > > So looks like these values are actually stored in the database. > > I can see a call to create ProgrammingLanguage records if they don't exist here https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/services/projects/detect_repository_languages_service.rb#L53