chore: relocate backend into apps/api ahead of monorepo merge

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/api/config/db.config.js

@@ -0,0 +1,46 @@
+/***********************************************************************************************************************************************************************
+ * File Name: db.config.js
+ * Type of Program: Configuration
+ * Description: Sequelize PostgreSQL connection instance.
+ *              Reads credentials from environment variables and exposes a single
+ *              authenticated Sequelize instance used across all models.
+ * Author: rgrgogu
+ * Date Created: Oct. 6, 2025
+ ***********************************************************************************************************************************************************************
+ * HOW TO USE:
+ *   const sequelize = require('./config/db.config');
+ *   // Then use sequelize.define() or import your models directly.
+ ***********************************************************************************************************************************************************************/
+require('dotenv').config();
+const { Sequelize } = require('sequelize');
+
+const useSSL = process.env.DB_SSL !== 'false';
+
+const sequelize = new Sequelize(
+  process.env.DB_NAME,
+  process.env.DB_USER,
+  process.env.DB_PASSWORD,
+  {
+    host: process.env.DB_HOST,
+    port: process.env.DB_PORT || 5432,
+    dialect: 'postgres',
+    dialectOptions: {
+      ...(useSSL && {
+        ssl: {
+          require: true,
+          rejectUnauthorized: false, // or provide CA cert if strict
+        },
+      }),
+    },
+    // logging: process.env.NODE_ENV === 'development' ? console.log : false,
+    logging: false,
+    pool: {
+      max: 10,
+      min: 0,
+      acquire: 30000,
+      idle: 10000,
+    },
+  }
+);
+
+module.exports = sequelize;