diff --git a/src/services/mysql.service.ts b/src/services/mysql.service.ts
index 13ae6c1..69b384f 100644
--- a/src/services/mysql.service.ts
+++ b/src/services/mysql.service.ts
@@ -90,10 +90,10 @@ const MySqlService = {
 		 *
 		 * @param {MysqlHandler} handler - The MySQL database handler.
 		 * @param {IDbUser} data - The user data to insert.
-		 * @returns {Promise<void>} A promise that resolves if the user was inserted successfully, or rejects with an error.
+		 * @returns {Promise<unknown>} A promise that resolves if the user was inserted successfully, or rejects with an error.
 		 * @throws {Error} If an error occurs while executing the query.
 		 */
-		insert(handler: MysqlHandler, data: IDbUser) {
+		insert(handler: MysqlHandler, data: IDbUser): Promise<unknown> {
 			return new Promise((resolve, reject) => {
 				if (!data.id) return reject('Id is undefined');
 				if (data.id.length !== 36) return reject('Id invalid');
@@ -112,7 +112,7 @@ const MySqlService = {
 					data.hash
 				]
 				try {
-					resolve(handler.execute(_sql, _values))
+					resolve(handler.execute(_sql, _values) as unknown)
 				} catch (err: unknown) {
 					reject(err as Error);
 				}
@@ -344,9 +344,15 @@ const MySqlService = {
 			})
 		}
 	},
-
 	Category: {
-		insert(handler: MysqlHandler, data: IDbCategory) {
+		/**
+		 * Inserts a category into the database.
+		 *
+		 * @param {MysqlHandler} handler - The MySQL handler object.
+		 * @param {IDbCategory} data - The category data to be inserted.
+		 * @return {Promise<unknown>} - A promise that resolves if the insertion is successful, and rejects with an error if it fails.
+		 */
+		insert(handler: MysqlHandler, data: IDbCategory): Promise<unknown> {
 			return new Promise((resolve, reject) => {
 				if (!data.id) return reject('Id is undefined');
 				if (data.id.length !== 36) return reject('Id invalid');
@@ -365,7 +371,15 @@ const MySqlService = {
 			})
 		},
 
-		update(handler: MysqlHandler, data: IDbCategory) {
+		/**
+		 * Updates a category in the database.
+		 *
+		 * @param {MysqlHandler} handler - The MySQL handler instance.
+		 * @param {IDbCategory} data - The category data to update.
+		 * @returns {Promise<unknown>} - A Promise that resolves with the result of the UPDATE query execution.
+		 * @throws {Error} - If an error occurs during execution.
+		 */
+		update(handler: MysqlHandler, data: IDbCategory): Promise<unknown> {
 			return new Promise((resolve, reject) => {
 				if (!data.id) return reject('Id is undefined');
 				if (data.id.length !== 36) return reject('Id invalid');
@@ -380,7 +394,6 @@ const MySqlService = {
 						data.display_name,
 						data.id
 					]
-
 					const _sql = `UPDATE "categories" SET ${_template} WHERE 'id' = ?`;
 					return resolve(handler.execute(_sql, _values));
 
@@ -388,7 +401,8 @@ const MySqlService = {
 					reject(err as Error);
 				}
 			})
-		}
+		},
+
 	}
 }