Social network on Nuxt 4, Postgres (Neon) and Better Auth

import { drizzle } from "drizzle-orm/postgres-js";
import postgres from "postgres";

// Neon pooled endpoint = PgBouncer transaction mode → prepared statements off.
// ponytail: single module-level client; the serverless runtime + PgBouncer do
// the pooling, so no custom pool/globalThis singleton dance needed.
const client = postgres(process.env.DATABASE_URL!, { prepare: false });

export const db = drizzle({ client });

import { boolean, pgTable, text, timestamp } from "drizzle-orm/pg-core";

export const user = pgTable("user", {
  id: text("id").primaryKey(),
  name: text("name").notNull(),
  email: text("email").notNull().unique(),
  emailVerified: boolean("email_verified").notNull().default(false),
  image: text("image"),
  createdAt: timestamp("created_at").notNull().defaultNow(),
  updatedAt: timestamp("updated_at").notNull().defaultNow(),
});

export const session = pgTable("session", {
  id: text("id").primaryKey(),
  expiresAt: timestamp("expires_at").notNull(),
  token: text("token").notNull().unique(),
  createdAt: timestamp("created_at").notNull().defaultNow(),
  updatedAt: timestamp("updated_at").notNull(),
  ipAddress: text("ip_address"),
  userAgent: text("user_agent"),
  userId: text("user_id")
    .notNull()
    .references(() => user.id, { onDelete: "cascade" }),
});

export const account = pgTable("account", {
  id: text("id").primaryKey(),
  accountId: text("account_id").notNull(),
  providerId: text("provider_id").notNull(),
  userId: text("user_id")
    .notNull()
    .references(() => user.id, { onDelete: "cascade" }),
  accessToken: text("access_token"),
  refreshToken: text("refresh_token"),
  idToken: text("id_token"),
  accessTokenExpiresAt: timestamp("access_token_expires_at"),
  refreshTokenExpiresAt: timestamp("refresh_token_expires_at"),
  scope: text("scope"),
  password: text("password"),
  createdAt: timestamp("created_at").notNull().defaultNow(),
  updatedAt: timestamp("updated_at").notNull(),
});

export const verification = pgTable("verification", {
  id: text("id").primaryKey(),
  identifier: text("identifier").notNull(),
  value: text("value").notNull(),
  expiresAt: timestamp("expires_at").notNull(),
  createdAt: timestamp("created_at").notNull().defaultNow(),
  updatedAt: timestamp("updated_at").notNull().defaultNow(),
});

// Better Auth instance (self-hosted, Nuxt 4).
import { betterAuth } from "better-auth";
import { drizzleAdapter } from "better-auth/adapters/drizzle";
// Reuse the SAME postgres-js/Drizzle client the db slice exported in
// server/lib/db.ts — Better Auth shares the pooled `DATABASE_URL` connection.
// Server code lives under server/ (Nitro); reach it via Nuxt's `~~` rootDir alias.
import { db } from "~~/server/lib/db";
import * as authSchema from "~~/server/db/auth-schema";

export const auth = betterAuth({
  // Drizzle adapter over the shared client. The schema is passed HERE (not into
  // drizzle()) — it is the only consumer that needs it, so the db client stays
  // schema-less. ponytail: do NOT enable experimental.joins; it is the one option
  // that would make the adapter reach into db._.fullSchema.
  // ponytail: usePlural stays false (the default) — with it true Better Auth would
  // look for `sessions`/`accounts` and could bind to the analytics/ledger app-type tables.
  database: drizzleAdapter(db, { provider: "pg", schema: authSchema }),
  // ponytail: email+password is the shortest real auth that works out of
  // the box — add socialProviders / plugins here when the app needs them.
  emailAndPassword: { enabled: true },
  secret: process.env.BETTER_AUTH_SECRET,
  baseURL: process.env.BETTER_AUTH_URL,
});

export type Session = typeof auth.$Infer.Session;

// Better Auth mounted as a Nitro catch-all route. auth.handler is framework-
// agnostic — (Request) => Promise<Response> — and toWebRequest adapts the H3
// event into a web Request. The `[...all]` param catches every /api/auth/*
// sub-path Better Auth routes internally.
// ponytail: Nuxt AUTO-IMPORTS defineEventHandler/toWebRequest from Nitro/H3 at
// runtime; we import them EXPLICITLY from h3 (Nitro's engine, a nuxt dep) so this
// handler type-checks under standalone tsc — the one idiom trade for verifiability.
import { defineEventHandler, toWebRequest } from "h3";
import { auth } from "~~/lib/auth";

export default defineEventHandler((event) => auth.handler(toWebRequest(event)));

// Vue/Nuxt client binding. better-auth/vue exposes the framework-appropriate client
// (signIn / signUp / useSession as Vue refs) — the Vue analog of the React client.
import { createAuthClient } from "better-auth/vue";

export const authClient = createAuthClient();

// Session gate — the Nuxt analog of Next's Edge proxy / RR8's requireAuth. A Nitro
// server middleware runs on every SSR/API request; guard the app surface and do the
// REAL server-side session check (like RR8 — stronger than Next's cookie-existence peek).
// ponytail: this guards SSR loads + direct hits + API — the true security boundary. For
// client-side SPA navigation add an app/middleware/*.ts route middleware (authored with
// Nuxt auto-imports; NOT tsc-gated, since plain tsc can't resolve them — spec §6).
// Explicit h3 imports so this type-checks standalone (see the handler note above).
import { defineEventHandler, getRequestURL, sendRedirect, toWebRequest } from "h3";
import { auth } from "~~/lib/auth";

export default defineEventHandler(async (event) => {
  const { pathname } = getRequestURL(event);
  // ponytail: guard the SaaS app surface; widen the prefixes per app-type.
  if (!pathname.startsWith("/dashboard") && !pathname.startsWith("/settings")) return;
  const session = await auth.api.getSession({ headers: toWebRequest(event).headers });
  if (!session) return sendRedirect(event, "/sign-in", 302);
});

// === file: server/db/schema.ts ===
import { relations } from "drizzle-orm";
import {
  index,
  pgTable,
  primaryKey,
  text,
  timestamp,
  unique,
  uuid,
} from "drizzle-orm/pg-core";
// Better Auth owns identity; we only reference its `user` table by id.
import { user } from "./auth-schema";

/** Public profile, one per Better Auth user. handle is the @-name in the URL. */
export const profiles = pgTable(
  "profiles",
  {
    id: uuid("id").primaryKey().defaultRandom(),
    // Better Auth's user.id is text — match it, don't recast. One profile per user.
    userId: text("user_id")
      .notNull()
      .unique()
      .references(() => user.id, { onDelete: "cascade" }),
    handle: text("handle").notNull().unique(),
    bio: text("bio"),
    avatarUrl: text("avatar_url"),
    createdAt: timestamp("created_at", { withTimezone: true })
      .notNull()
      .defaultNow(),
  },
  (t) => [index("idx_profile_handle").on(t.handle)],
);

/** Directed follow edge: follower -> following. Both ends are Better Auth users. */
export const follows = pgTable(
  "follows",
  {
    // Better Auth's user.id is text — match it, don't recast.
    followerId: text("follower_id")
      .notNull()
      .references(() => user.id, { onDelete: "cascade" }),
    followingId: text("following_id")
      .notNull()
      .references(() => user.id, { onDelete: "cascade" }),
    createdAt: timestamp("created_at", { withTimezone: true })
      .notNull()
      .defaultNow(),
  },
  (t) => [
    primaryKey({ columns: [t.followerId, t.followingId] }),
    // The edge is the identity — you can't follow the same user twice.
    unique("follows_follower_following_unique").on(
      t.followerId,
      t.followingId,
    ),
    // Drives the "who follows this user" (followers list) query.
    index("idx_follow_following").on(t.followingId),
  ],
);

/** Authored post in the feed. */
export const posts = pgTable(
  "posts",
  {
    id: uuid("id").primaryKey().defaultRandom(),
    // Better Auth's user.id is text — match it, don't recast.
    authorId: text("author_id")
      .notNull()
      .references(() => user.id, { onDelete: "cascade" }),
    body: text("body").notNull(),
    createdAt: timestamp("created_at", { withTimezone: true })
      .notNull()
      .defaultNow(),
  },
  (t) => [
    // Drives the per-author profile timeline query.
    index("idx_post_author").on(t.authorId),
  ],
);

/** post <-> user like edge. The composite unique is the like identity. */
export const postLikes = pgTable(
  "post_likes",
  {
    postId: uuid("post_id")
      .notNull()
      .references(() => posts.id, { onDelete: "cascade" }),
    // Better Auth's user.id is text — match it, don't recast.
    userId: text("user_id")
      .notNull()
      .references(() => user.id, { onDelete: "cascade" }),
    createdAt: timestamp("created_at", { withTimezone: true })
      .notNull()
      .defaultNow(),
  },
  (t) => [
    primaryKey({ columns: [t.postId, t.userId] }),
    // One like per user per post.
    unique("post_likes_post_user_unique").on(t.postId, t.userId),
    index("idx_post_likes_user").on(t.userId),
  ],
);

export const profilesRelations = relations(profiles, ({ one }) => ({
  user: one(user, { fields: [profiles.userId], references: [user.id] }),
}));

export const followsRelations = relations(follows, ({ one }) => ({
  follower: one(user, {
    fields: [follows.followerId],
    references: [user.id],
  }),
  following: one(user, {
    fields: [follows.followingId],
    references: [user.id],
  }),
}));

export const postsRelations = relations(posts, ({ one, many }) => ({
  author: one(user, { fields: [posts.authorId], references: [user.id] }),
  likes: many(postLikes),
}));

export const postLikesRelations = relations(postLikes, ({ one }) => ({
  post: one(posts, {
    fields: [postLikes.postId],
    references: [posts.id],
  }),
  user: one(user, { fields: [postLikes.userId], references: [user.id] }),
}));

import { drizzle } from "drizzle-orm/postgres-js";
import postgres from "postgres";

// Serverless: one connection per (short-lived) instance; Neon's pooler multiplexes.
export const sql = postgres(process.env.DATABASE_URL!, { prepare: false, max: 1 });
export const db = drizzle(sql);

import { drizzle } from "drizzle-orm/postgres-js";
import postgres from "postgres";

// Long-running process: a real, reused pool. Still prepare:false on the pooled endpoint.
export const sql = postgres(process.env.DATABASE_URL!, { prepare: false, max: 10, idle_timeout: 20 });
export const db = drizzle(sql);

import { neon } from "@neondatabase/serverless";
import { drizzle } from "drizzle-orm/neon-http";

// Edge/Workers have NO TCP sockets, so postgres-js cannot run here. Neon's HTTP
// driver speaks Postgres over fetch — the only client that works on Workers.
export const sql = neon(process.env.DATABASE_URL!);
export const db = drizzle(sql);