[1.4.13] multi-session with same user

const uniqueUserSessions = validSessions.reduce(
  (acc, session) => {
    if (!acc.find((s) => s.user.id === session.user.id)) {
      acc.push(session);
    }
    return acc;
  },
  [] as typeof validSessions,
);

export const auth = betterAuth({
    secret: env.BETTER_AUTH_SECRET,
    baseURL: env.BETTER_AUTH_URL,

    plugins: [
        multiSession(),

        genericOAuth({
            config: [
                keycloak({
                    clientId: env.BETTER_AUTH_KEYCLOAK_CLIENT_ID,
                    clientSecret: env.BETTER_AUTH_KEYCLOAK_CLIENT_SECRET,
                    issuer: env.BETTER_AUTH_KEYCLOAK_ISSUER,
                }),
            ],
        }),

        // make sure this is the last plugin in the array
        // https://www.better-auth.com/docs/integrations/next#server-action-cookies
        nextCookies(),
    ],
});