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Language data (languages, locales, and language-locale pairs) is synced automatically by the front-init container on startup. The sync-language-data admin-cli command can be run manually in production to retry or debug syncing language data in case of any issues or missing language pairs.

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Applying Changes

  1. Preview changes with a dry run (no database modifications):
yarn admin-cli sync-language-data -d
  1. Run the sync:
yarn admin-cli sync-language-data The command will prompt for confirmation before making changes. The current git commit hash is recorded as the migration identifier for traceability.

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Rolling Back Changes

If you need to undo a sync, use the --undo / -u flag. This is a two-step process:
  1. On the commit that was synced, run undo to delete the pairs it inserted:
    yarn admin-cli sync-language-data --undo
  2. Check out the previous commit and re-run the sync to restore any rows that were updated:
    git checkout <previous-commit>
    yarn admin-cli sync-language-data
The undo only removes LanguageLocalePairs rows matching the commit’s migration ID. It does not revert updates to existing rows (such as changes to providers or MT settings). Re-running the sync from the previous commit handles that.