Database migrations

db/index.js

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+const { Sequelize } = require('sequelize');
+const { join } = require('path');
+const fs = require('fs');
+const Umzug = require('umzug');
+
+const Logger = require('../utils/Logger');
+const logger = new Logger();
+
+const sequelize = new Sequelize({
+  dialect: 'sqlite',
+  storage: './data/db.sqlite',
+  logging: false,
+});
+
+const umzug = new Umzug({
+  migrations: {
+    path: join(__dirname, './migrations'),
+    params: [sequelize.getQueryInterface()],
+  },
+  storage: 'sequelize',
+  storageOptions: {
+    sequelize,
+  },
+});
+
+const connectDB = async () => {
+  try {
+    if (fs.existsSync('data/db.sqlite')) {
+      fs.copyFileSync('data/db.sqlite', 'data/backup_db.sqlite');
+    }
+
+    await sequelize.authenticate();
+    logger.log('Connected to database');
+
+    // migrations
+    const pendingMigrations = await umzug.pending();
+
+    if (pendingMigrations.length > 0) {
+      logger.log('Executing pending migrations');
+      await umzug.up();
+    }
+  } catch (error) {
+    logger.log(`Unable to connect to the database: ${error.message}`, 'ERROR');
+    process.exit(1);
+  }
+};
+
+module.exports = {
+  connectDB,
+  sequelize,
+};