config files and scripts for database migration system

backend/config/database.js

@@ -1,21 +1,62 @@
-const { Sequelize } = require('sequelize');
+const { Sequelize } = require("sequelize");
 
+// Load environment variables based on NODE_ENV
+// This ensures variables are available for both CLI and programmatic usage
+if (!process.env.DB_NAME && process.env.NODE_ENV) {
+  const dotenv = require("dotenv");
+  const envFile = `.env.${process.env.NODE_ENV}`;
+  const result = dotenv.config({ path: envFile });
+  if (result.error && process.env.NODE_ENV !== "production") {
+    console.warn(
+      `Warning: Could not load ${envFile}, using existing environment variables`
+    );
+  }
+}
+
+// Database configuration object
+// Used by both Sequelize CLI and programmatic initialization
+const dbConfig = {
+  username: process.env.DB_USER,
+  password: process.env.DB_PASSWORD,
+  database: process.env.DB_NAME,
+  host: process.env.DB_HOST,
+  port: process.env.DB_PORT || 5432,
+  dialect: "postgres",
+  logging: false,
+  pool: {
+    max: 5,
+    min: 0,
+    acquire: 10000,
+    idle: 10000,
+  },
+};
+
+// Configuration for Sequelize CLI (supports multiple environments)
+// All environments use the same configuration from environment variables
+const cliConfig = {
+  development: dbConfig,
+  dev: dbConfig,
+  test: dbConfig,
+  qa: dbConfig,
+  production: dbConfig,
+  prod: dbConfig,
+};
+
+// Create Sequelize instance for programmatic use
 const sequelize = new Sequelize(
-  process.env.DB_NAME,
-  process.env.DB_USER,
-  process.env.DB_PASSWORD,
+  dbConfig.database,
+  dbConfig.username,
+  dbConfig.password,
   {
-    host: process.env.DB_HOST,
-    port: process.env.DB_PORT,
-    dialect: 'postgres',
-    logging: false,
-    pool: {
-      max: 5,
-      min: 0,
-      acquire: 30000,
-      idle: 10000
-    }
+    host: dbConfig.host,
+    port: dbConfig.port,
+    dialect: dbConfig.dialect,
+    logging: dbConfig.logging,
+    pool: dbConfig.pool,
   }
 );
 
-module.exports = sequelize;
+// Export the sequelize instance as default (for backward compatibility)
+// Also export all environment configs for Sequelize CLI
+module.exports = sequelize;
+Object.assign(module.exports, cliConfig);