Keycloak provider using session id as user id instead of subject id

/** biome-ignore-all lint/style/noMagicNumbers: <30 days> */
import { betterAuth } from "better-auth";
import { genericOAuth, keycloak } from "better-auth/plugins";
import { tanstackStartCookies } from "better-auth/tanstack-start";

export const auth = betterAuth({
    basePath: "/eagle/api/auth",
    secret: process.env.BETTER_AUTH_SECRET ?? "",
    trustedOrigins: ["https://<>.com/", "https://<>.com/<>/", process.env.BETTER_AUTH_URL ?? "", "http://localhost:3000"],
    session: {
        // Set session to last 30 days (in seconds)
        expiresIn: 30 * 24 * 60 * 60,
        updateAge: 24 * 60 * 60, // 1 day
        // If you are using cookie caching, update its maxAge if needed
        cookieCache: {
        enabled: true,
        maxAge: 30 * 24 * 60 * 60 // match the session lifetime
        }
    },
    plugins: [genericOAuth({
        config: [
            keycloak({
                clientId: "eagle-platform",
                clientSecret: process.env.AUTH_KEYCLOAK_CLIENT_SECRET ?? "",
                issuer: "https://sso.<>d.com/realms/<>",
            }),
        ]
    }), tanstackStartCookies()],
});