feat: layer sqlite e repository posts con test

src/lib/db.ts

@@ -0,0 +1,47 @@
+import Database from 'better-sqlite3';
+import { mkdirSync } from 'node:fs';
+import { dirname } from 'node:path';
+
+const SCHEMA = `
+CREATE TABLE IF NOT EXISTS posts (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  title TEXT NOT NULL,
+  slug TEXT NOT NULL UNIQUE,
+  category TEXT NOT NULL,
+  excerpt TEXT NOT NULL DEFAULT '',
+  body_html TEXT NOT NULL DEFAULT '',
+  cover TEXT,
+  draft INTEGER NOT NULL DEFAULT 1,
+  published_at TEXT,
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+CREATE TABLE IF NOT EXISTS users (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  username TEXT NOT NULL UNIQUE,
+  password_hash TEXT NOT NULL
+);
+CREATE TABLE IF NOT EXISTS sessions (
+  token TEXT PRIMARY KEY,
+  user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  expires_at TEXT NOT NULL
+);
+CREATE INDEX IF NOT EXISTS idx_posts_pub ON posts (draft, published_at DESC);
+`;
+
+export function createDb(path?: string): Database.Database {
+  const p = path ?? process.env.DB_PATH ?? 'data/insanitylab.db';
+  if (p !== ':memory:') mkdirSync(dirname(p), { recursive: true });
+  const db = new Database(p);
+  db.pragma('journal_mode = WAL');
+  db.pragma('foreign_keys = ON');
+  db.exec(SCHEMA);
+  return db;
+}
+
+let singleton: Database.Database | null = null;
+
+export function getDb(): Database.Database {
+  if (!singleton) singleton = createDb();
+  return singleton;
+}