code: def create(cls, event):
          
          # Check if the release has already been received
          release_id = event.payload['release']['id']
          existing_release = Release.query.filter_by(
              release_id=release_id,
          ).first()
          if existing_release:
              raise ReleaseAlreadyReceivedError(
                  u'{release} has already been received.'
                  .format(release=existing_release)
              )
  
          # Create the Release
          repo_id = event.payload['repository']['id']
          repo = Repository.get(user_id=event.user_id, github_id=repo_id)
          if repo.enabled:
              with db.session.begin_nested():
                  release = cls(
                      release_id=release_id,
                      tag=event.payload['release']['tag_name'],
                      repository=repo,
                      event=event,
                      status=ReleaseStatus.RECEIVED,
                  )
                  db.session.add(release)
              return release
          else:
              current_app.logger.warning(
                  u'Release creation attempt on disabled {repo}.'
                  .format(repo=repo)
              )
              raise RepositoryDisabledError(
                  u'{repo} is not enabled for webhooks.'.format(repo=repo)
              )
docs: Create a new Release model.