Initial scaffold: offertesysteem (clients, projects, quotes, quote_items)

- Next.js 15 + TypeScript + Tailwind, standalone output
- SQLite schema: users, clients, projects, quotes, quote_items
- HMAC-signed sessie-cookie auth
- Dockerfile (Node 22 Alpine, multi-stage)
- create-admin script
- Doel: portal.rikxplatform.nl

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/db.ts

@@ -0,0 +1,74 @@
+import { DatabaseSync } from "node:sqlite";
+import path from "path";
+
+const DB_PATH =
+  process.env.DB_PATH || path.join(process.cwd(), "data", "app.db");
+
+let _db: DatabaseSync | null = null;
+
+export function getDb(): DatabaseSync {
+  if (!_db) {
+    _db = new DatabaseSync(DB_PATH);
+    _db.exec("PRAGMA journal_mode = WAL");
+    _db.exec("PRAGMA foreign_keys = ON");
+    migrate(_db);
+  }
+  return _db;
+}
+
+function migrate(db: DatabaseSync) {
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS users (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      email TEXT NOT NULL UNIQUE,
+      password_hash TEXT NOT NULL,
+      name TEXT NOT NULL,
+      role TEXT NOT NULL DEFAULT 'admin',
+      created_at TEXT NOT NULL DEFAULT (datetime('now'))
+    );
+
+    CREATE TABLE IF NOT EXISTS clients (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      name TEXT NOT NULL,
+      email TEXT,
+      phone TEXT,
+      address TEXT,
+      notes TEXT,
+      created_at TEXT NOT NULL DEFAULT (datetime('now')),
+      updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+    );
+
+    CREATE TABLE IF NOT EXISTS projects (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      client_id INTEGER NOT NULL REFERENCES clients(id),
+      title TEXT NOT NULL,
+      description TEXT,
+      status TEXT NOT NULL DEFAULT 'active',
+      created_at TEXT NOT NULL DEFAULT (datetime('now')),
+      updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+    );
+
+    CREATE TABLE IF NOT EXISTS quotes (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      project_id INTEGER NOT NULL REFERENCES projects(id),
+      title TEXT NOT NULL,
+      status TEXT NOT NULL DEFAULT 'draft',
+      notes TEXT,
+      sent_at TEXT,
+      accepted_at TEXT,
+      created_at TEXT NOT NULL DEFAULT (datetime('now')),
+      updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+    );
+
+    CREATE TABLE IF NOT EXISTS quote_items (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      quote_id INTEGER NOT NULL REFERENCES quotes(id) ON DELETE CASCADE,
+      description TEXT NOT NULL,
+      quantity REAL NOT NULL DEFAULT 1,
+      unit TEXT,
+      unit_price REAL NOT NULL DEFAULT 0,
+      total REAL GENERATED ALWAYS AS (quantity * unit_price) VIRTUAL,
+      sort_order INTEGER NOT NULL DEFAULT 0
+    );
+  `);
+}