diff --git a/src/services/mysql.service.ts b/src/services/mysql.service.ts
index e426163..3bdf5fe 100644
--- a/src/services/mysql.service.ts
+++ b/src/services/mysql.service.ts
@@ -361,7 +361,7 @@ const MySqlService = {
 		 */
 		getById(handler: MysqlHandler, brandId: string): Promise<IDbBrand> {
 			return new Promise((resolve, reject) => {
-				if (!brandId) return reject('slug is undefined')
+				if (!brandId) return reject('Id is undefined')
 				if (brandId.length !== 36) return reject('Id invalid');
 				const _sql = "SELECT * FROM `brands` WHERE `id` = ?";
 				const _values = [brandId];
@@ -447,14 +447,14 @@ const MySqlService = {
 		 * Retrieves a database model by slug from a given MySQL handler.
 		 *
 		 * @param {MysqlHandler} handler - The MySQL handler instance.
-		 * @param {string} slug - The slug of the model to retrieve.
+		 * @param {string} modelSlug - The slug of the model to retrieve.
 		 * @return {Promise<IDbModel>} A promise that resolves with the retrieved model.
 		 * @throws {Error} If there was an error executing the query.
 		 */
-		getBySlug(handler: MysqlHandler, slug: string): Promise<IDbModel> {
+		getBySlug(handler: MysqlHandler, modelSlug: string): Promise<IDbModel> {
 			return new Promise((resolve, reject) => {
-				const _sql = "SELECT * FROM `models` WHERE `slug` = ?";
-				const _values = [slug];
+				const _sql = "SELECT * FROM `models` WHERE `slug_name` = ?";
+				const _values = [modelSlug];
 				try {
 					resolve(handler.execute(_sql, _values) as unknown as IDbModel);
 				} catch (err: unknown) {
@@ -462,6 +462,13 @@ const MySqlService = {
 				}
 			});
 		},
+		/**
+		 * Retrieves a model by its ID from the database.
+		 *
+		 * @param {MysqlHandler} handler - The MySQL handler object used to execute the SQL query.
+		 * @param {string} modelId - The ID of the model to retrieve.
+		 * @return {Promise<IDbModel>} - A promise that resolves with the retrieved model, or rejects with an error.
+		 */
 		getById(handler: MysqlHandler, modelId: string): Promise<IDbModel> {
 			return new Promise((resolve, reject) => {
 				const _sql = "SELECT * FROM `models` WHERE `id` = ?";
@@ -474,12 +481,19 @@ const MySqlService = {
 			});
 		},
 
-		insert(handler: MysqlHandler, data: IDbModel) {
+		/**
+		 * Inserts a new record into the `models` table.
+		 *
+		 * @param {MysqlHandler} handler - The MySQL handler instance.
+		 * @param {IDbModel} data - The data to be inserted.
+		 * @returns {Promise<unknown>} - A Promise that resolves with the execution result or rejects with an error.
+		 */
+		insert(handler: MysqlHandler, data: IDbModel): Promise<unknown> {
 			return new Promise((resolve, reject) => {
 				if (!data.id) return reject('Id is undefined');
 				if (data.id.length !== 36) return reject('Id invalid');
 
-				const _sql = "INSERT INTO `users`(`id`,`username`, `firstname`, `lastname`, `dob`, `email`, `is_mail_verified`, `is_admin`, `gdpr`, `hash`) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)"
+				const _sql = "INSERT INTO `models`(`slug_name`,`display_name`, `brand_id`, `category_id`, `image_blob`, `is_trending`, `base_price`, `id`) VALUES (?, ?, ?, ?, ?, ?, ?, ?)"
 				const _values = [
 					data.slug_name,
 					data.display_name,
@@ -487,7 +501,8 @@ const MySqlService = {
 					data.category_id,
 					data.image_blob,
 					data.is_trending,
-					data.base_price
+					data.base_price,
+					data.id
 				]
 				try {
 					resolve(handler.execute(_sql, _values))
@@ -578,15 +593,15 @@ const MySqlService = {
 		 * Retrieves a category from the database by its slug.
 		 *
 		 * @param {MysqlHandler} handler - The MySQL handler object to execute the query.
-		 * @param {string} slug - The slug of the category to retrieve.
+		 * @param {string} categorySlug - The slug of the category to retrieve.
 		 * @returns {Promise<IDbCategory>} - A promise that resolves with the retrieved category object.
 		 * @throws {Error} - If an error occurs while executing the query.
 		 */
-		getBySlug(handler: MysqlHandler, slug: string): Promise<IDbCategory> {
+		getBySlug(handler: MysqlHandler, categorySlug: string): Promise<IDbCategory> {
 			return new Promise((resolve, reject) => {
-				if (!slug) return reject('slug is undefined')
+				if (!categorySlug) return reject('slug is undefined')
 				const _sql = "SELECT * FROM `categories` WHERE `slug_name` = ?";
-				const _values = [slug];
+				const _values = [categorySlug];
 				try {
 					resolve(handler.execute(_sql, _values) as unknown as IDbCategory);
 				} catch (err: unknown) {