add multi trainings +fix path for coco retraining

backend/database/database.js

@@ -1,10 +0,0 @@
-// database.js
-const { Sequelize } = require('sequelize');
-
-const sequelize = new Sequelize('myapp', 'root', 'root', {
-  host: 'localhost',
-  dialect: 'mysql',
-  logging: false,
-});
-
-module.exports = sequelize;

backend/database/migration_add_image_dimensions.sql

@@ -1,12 +0,0 @@
--- Migration: Add width and height columns to image table
--- Date: 2025-11-27
-
-USE myapp;
-
--- Add width and height columns to image table
-ALTER TABLE `image` 
-ADD COLUMN `width` FLOAT NULL AFTER `image_path`,
-ADD COLUMN `height` FLOAT NULL AFTER `width`;
-
--- Verify the changes
-DESCRIBE `image`;

backend/database/migration_fix_image_dimensions.sql

@@ -1,12 +0,0 @@
--- Migration to change width and height from FLOAT to INT in image table
--- Run this after updating the Images model
-
--- First, backup the table (optional but recommended)
--- CREATE TABLE image_backup AS SELECT * FROM image;
-
--- Alter the columns to INT type
-ALTER TABLE image MODIFY COLUMN width INT;
-ALTER TABLE image MODIFY COLUMN height INT;
-
--- Verify the changes
-DESCRIBE image;