async function revoke(userId, sessionId) {
  const session = await db.Session.findOne({
    attributes: ['id'],
    where: {
      id: sessionId,
      user_id: userId,
    },
  });

  if (session === null) {
    throw new NotFoundError('Session not found');
  }

  // revoke session in DB
  await session.update({ revoked: true });

  // revoke access token in RAM cache
  this.cache.set(`revoked_session:${sessionId}`, true);

  return {
    id: session.id,
    revoked: true,
  };
}
@description Revoke a session.
@param {string} userId - Id of the user.
@param {string} sessionId - Uuid of the session.
@returns {Promise} Return the revoked session.
@example
revoke('375223b3-71c6-4b61-a346-0a9d5baf12b4', '0a5f7305-4faf-42b3-aeb2-fbc0217c4855');