Fix healthchecks: install curl in backend and frontend images

backend/config/database.js

@@ -0,0 +1,22 @@
+const { Sequelize } = require('sequelize');
+
+const sequelize = new Sequelize({
+  dialect: 'sqlite',
+  storage: process.env.DB_PATH || './database.sqlite',
+  logging: false,
+});
+
+const connectDB = async () => {
+  try {
+    await sequelize.authenticate();
+    console.log('Database connected.');
+    await sequelize.sync();
+    console.log('Database synced.');
+  } catch (err) {
+    console.error('Database connection error:', err);
+    // Retry after 5s
+    setTimeout(connectDB, 5000);
+  }
+};
+
+module.exports = { sequelize, connectDB };