image optimization. Image resizing client side, index added to db, pagination

backend/migrations/20251230000001-add-geospatial-index.js

@@ -0,0 +1,20 @@
+'use strict';
+
+/** @type {import('sequelize-cli').Migration} */
+module.exports = {
+  async up(queryInterface, Sequelize) {
+    // Add index on latitude and longitude columns for faster geospatial queries
+    // This improves performance of the bounding box pre-filter used in radius searches
+    await queryInterface.addIndex('Items', ['latitude', 'longitude'], {
+      name: 'idx_items_lat_lng',
+      where: {
+        latitude: { [Sequelize.Op.ne]: null },
+        longitude: { [Sequelize.Op.ne]: null }
+      }
+    });
+  },
+
+  async down(queryInterface, Sequelize) {
+    await queryInterface.removeIndex('Items', 'idx_items_lat_lng');
+  }
+};