code: def sync_hooks(user_id, repositories):
      
      from .api import GitHubAPI
  
      try:
          # Sync hooks
          gh = GitHubAPI(user_id=user_id)
          for repo_id in repositories:
              try:
                  with db.session.begin_nested():
                      gh.sync_repo_hook(repo_id)
                  # We commit per repository, because while the task is running
                  # the user might enable/disable a hook.
                  db.session.commit()
              except RepositoryAccessError as e:
                  current_app.logger.warning(e.message, exc_info=True)
              except NoResultFound:
                  pass  # Repository not in DB yet
      except Exception as exc:
          sync_hooks.retry(exc=exc)
docs: Sync repository hooks for a user.