diff --git a/backend/src/db.js b/backend/src/db.js
new file mode 100644
index 0000000..236ce57
--- /dev/null
+++ b/backend/src/db.js
@@ -0,0 +1,118 @@
+import Database from 'better-sqlite3';
+import fs from 'fs';
+import path from 'path';
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+const dbPath = process.env.DATABASE_PATH || './data/vk_hub.sqlite';
+const dir = path.dirname(dbPath);
+if (!fs.existsSync(dir)) fs.mkdirSync(dir, { recursive: true });
+
+export const db = new Database(dbPath);
+db.pragma('journal_mode = WAL');
+db.pragma('foreign_keys = ON');
+
+export function migrate() {
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS users (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      vk_user_id TEXT UNIQUE NOT NULL,
+      first_name TEXT,
+      last_name TEXT,
+      avatar_url TEXT,
+      created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+      updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
+    );
+
+    CREATE TABLE IF NOT EXISTS groups (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      vk_group_id TEXT UNIQUE NOT NULL,
+      title TEXT NOT NULL,
+      screen_name TEXT,
+      telegram_chat_id TEXT,
+      plan TEXT NOT NULL DEFAULT 'free',
+      created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+      updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
+    );
+
+    CREATE TABLE IF NOT EXISTS group_members (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      group_id INTEGER NOT NULL REFERENCES groups(id) ON DELETE CASCADE,
+      user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+      role TEXT NOT NULL DEFAULT 'client',
+      created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+      UNIQUE(group_id, user_id)
+    );
+
+    CREATE TABLE IF NOT EXISTS services (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      group_id INTEGER NOT NULL REFERENCES groups(id) ON DELETE CASCADE,
+      title TEXT NOT NULL,
+      description TEXT,
+      price INTEGER NOT NULL DEFAULT 0,
+      duration_minutes INTEGER,
+      is_active INTEGER NOT NULL DEFAULT 1,
+      created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+      updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
+    );
+
+    CREATE TABLE IF NOT EXISTS clients (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      group_id INTEGER NOT NULL REFERENCES groups(id) ON DELETE CASCADE,
+      user_id INTEGER REFERENCES users(id) ON DELETE SET NULL,
+      name TEXT NOT NULL,
+      phone TEXT,
+      note TEXT,
+      created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
+    );
+
+    CREATE TABLE IF NOT EXISTS leads (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      group_id INTEGER NOT NULL REFERENCES groups(id) ON DELETE CASCADE,
+      client_id INTEGER REFERENCES clients(id) ON DELETE SET NULL,
+      service_id INTEGER REFERENCES services(id) ON DELETE SET NULL,
+      title TEXT NOT NULL,
+      name TEXT NOT NULL,
+      phone TEXT,
+      comment TEXT,
+      status TEXT NOT NULL DEFAULT 'new',
+      source TEXT NOT NULL DEFAULT 'vk_mini_app',
+      created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
+      updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
+    );
+
+    CREATE TABLE IF NOT EXISTS lead_comments (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      lead_id INTEGER NOT NULL REFERENCES leads(id) ON DELETE CASCADE,
+      user_id INTEGER REFERENCES users(id) ON DELETE SET NULL,
+      body TEXT NOT NULL,
+      created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
+    );
+
+    CREATE TABLE IF NOT EXISTS faq_items (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      group_id INTEGER NOT NULL REFERENCES groups(id) ON DELETE CASCADE,
+      question TEXT NOT NULL,
+      answer TEXT NOT NULL,
+      sort_order INTEGER NOT NULL DEFAULT 100,
+      is_active INTEGER NOT NULL DEFAULT 1,
+      created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
+    );
+
+    CREATE TABLE IF NOT EXISTS audit_logs (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      group_id INTEGER REFERENCES groups(id) ON DELETE SET NULL,
+      user_id INTEGER REFERENCES users(id) ON DELETE SET NULL,
+      action TEXT NOT NULL,
+      payload TEXT,
+      created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
+    );
+  `);
+}
+
+migrate();
+
+if (process.argv.includes('--migrate')) {
+  console.log('Database migrated:', dbPath);
+}