Posthog identify after sign up

export const auth = betterAuth({
  database: prismaAdapter(prisma, {
    provider: 'postgresql',
  }),
  session: {
    expiresIn: ONE_YEAR_IN_SECONDS,
  },
  emailAndPassword: {
    enabled: true,
    requireEmailVerification: true,
    sendResetPassword: async ({ user, url }) => {
      const email = getResetPasswordEmail(url);
      await sendEmail(user.email, 'Reset your password', email);
    },
  },
  emailVerification: {
    sendVerificationEmail: async ({ user, url }) => {
      const email = getSignUpVerificationEmail(url);
      await sendEmail(user.email, 'Verify your email address', email);
    },
    expiresAt: ONE_DAY_IN_SECONDS,
    sendOnSignUp: true,
    autoSignInAfterVerification: true,
  },
  plugins: [
    customSession(async ({ user, session }) => {
      const roles = await getRoles();
      return {
        session,
        user: {
          ...user,
          roles: roles.map((role: { name: string }) => role.name),
        },
      };
    }),
  ],
  hooks: {
    after: createAuthMiddleware(async (ctx) => {
      if (ctx.path.startsWith('/verify-email')) {
        const newSession = ctx.context.newSession;
        ...
      }
    }),
  },
});